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4250 Flow Meter
Section 5  Maintenance and Service

5-14

4. While still pressing the

 4

 and 

Exit Program

 keys, turn 

the flow meter on again. Wait until the display reappears 
before releasing the keys.

Pressing 

4

 and 

Exit Program

 may leave some values pro-

grammed into the flow meter’s computer. If you want to remove

all

 programmed entries, hold down 

1

 and 

Clear Entry

 while

powering up the flow meter.

The following messages describe serious internal problems, indi-
cating service is required:

ROM CHECKSUM ERROR - or - 

FOUND BAD RAM - CALL CUSTOMER SERVICE

If these messages appear, call the Teledyne Isco Customer
Service Department at (800) 228-4373.

CAUTION

Do not attempt to disassemble or repair the 4250 Flow Meter
(other than changing fuses) unless you are skilled in the evalu-
ation and repair of microprocessor-based circuitry. Teledyne
Isco recommends no attempt be made to disassemble or
repair the printer mechanism or display module.

5.6 Preliminary 

Troubleshooting Steps

The electronic circuitry of the 4250 is solid-state and its reli-
ability is high. If the unit should fail to operate properly, the
problem is most likely a mechanical failure. Items such as a
broken or intermittent connections in the power cable or wiring
harness or (rarely) poor electrical connection through keypad
switches should be suspected.

5.6.1 If Serious Problems 

Occur

If you suspect an electronic problem, Teledyne Isco recommends
that you contact the Technical Service Department. 

Contact

information can be found on the Warranty page at the
back of this manual.

 Our Technical Service Department has

trained technicians and specially designed equipment necessary
for timely, efficient repair of the 4250 Flow Meter. If you still
wish to attempt repairs, the Customer Service Department is
available to provide additional advice and information on ser-
vicing.

5.6.2 Inspection Protocol

When attempting to isolate problems within the unit, you should
assume that the CPU and memory are working properly until
attempts to find problems in the peripheral circuitry have been
exhausted. 

This is for two reasons:

• The likelihood of failure is far greater on transistor drive 

circuits (heavier currents are handled here), than on the 
CPU or memory.

• The CPU and memory are not serviceable and must be 

replaced if found to be faulty.

Summary of Contents for 4250

Page 1: ...4250 Area Velocity Flow Meter Installation and Operation Guide Part 60 3253 042 of Assembly 60 3254 012 Copyright 1994 All rights reserved Teledyne Isco Revision BB October 11 2013 ...

Page 2: ......

Page 3: ...rization Number specified Be sure to include a note describing the malfunction This will aid in the prompt repair and return of the equipment Teledyne Isco welcomes suggestions that would improve the information presented in this manual or enhance the operation of the equipment itself Teledyne Isco is continually improving its products and reserves the right to change product specifications replac...

Page 4: ......

Page 5: ... Si vous utilisez cet instrument d une manière autre que celles qui sont specifiées dans ce manuel la protection fournie de l instrument peut être affaiblie cela augmentera votre risque de blessure Hazard Severity Levels This manual applies Hazard Severity Levels to the safety alerts These three levels are described in the sample alerts below CAUTION Cautions identify a potential hazard which if n...

Page 6: ...e sécurité Ce symbole signale l existence d instructions importantes relatives au produit dans ce manuel Ce symbole signale la présence d un danger d électocution Warnungen und Vorsichtshinweise Das Ausrufezeichen in Dreieck ist ein Warnzeichen das Sie darauf aufmerksam macht daß wichtige Anleitungen zu diesem Handbuch gehören Der gepfeilte Blitz im Dreieck ist ein Warnzeichen das Sei vor gefährli...

Page 7: ...Operating Mode 2 5 2 3 2 Step 2 Flow Conversion Type 2 5 2 3 3 Step 3 Adjust Level Parameters 2 7 2 3 4 Step 4 Reset Totalizer 2 8 2 3 5 Step 5 Sampler Pacing 2 9 2 3 6 Step 6 Sampler Enable 2 9 2 3 7 Step 7 Alarm Dialout Mode 2 10 2 3 8 Step 8 Printer 2 10 2 3 9 Step 9 Reports History 2 11 2 4 Interpreting the Program Screens 2 11 2 4 1 Operating Mode 2 11 2 4 2 Optional Outputs 2 19 2 4 3 Step 1...

Page 8: ...ptions and Accessories 4 1 4200T Modem 4 1 4 1 1 How it Works 4 1 4 1 2 Modems and Flowlink Software 4 2 4 1 3 Connection to a Telephone Line 4 2 4 1 4 Types of Service 4 3 4 2 Connection to External Serial Device 4 4 4 3 4 20 mA Analog Outputs External and Internal 4 4 4 3 1 External 4 20 mA Output Interface 4 5 4 3 2 Internal Multiple Analog Output Board 4 6 4 4 Pacing Non Isco Equipment 4 8 4 5...

Page 9: ...ter 5 11 5 5 Servicing And Troubleshooting 5 11 5 5 1 Disassembling the Flow Meter 5 11 5 5 2 Fuse Replacement 5 12 5 5 3 Display Warnings 5 13 5 5 4 System Reset 5 13 5 6 Preliminary Troubleshooting Steps 5 14 5 6 1 If Serious Problems Occur 5 14 5 6 2 Inspection Protocol 5 14 5 7 Precautions for Servicing CMOS Circuitry 5 16 5 7 1 Hazard of Static Electricity 5 16 5 8 Software Updates 5 18 5 8 1...

Page 10: ...Compression Bushing 3 11 3 7 Methods of Level Measurement 3 15 3 8 Isco Rectangular Mounting Plate 3 16 3 9 Sensor Installed on a Spring Ring 3 17 3 10 Scissors Ring Adjustment 3 19 4 1 Type E Interface for pacing non Isco equipment 4 8 4 2 Flow meter with front panel removed 4 9 4 3 Removing the lower shield 4 10 4 4 Type E modification 4 10 4 5 674 Tipping Bucket Rain Gauge 4 11 4 6 Temperature ...

Page 11: ...Sensor 1 10 1 4 Technical Specifications for the Low Profile AV Sensor 1 11 1 5 4250 Chart Longevity 1 12 1 6 Battery Life Expectancy 1 12 2 1 ASCII Output Codes 2 22 4 1 4 20 mA Output Interface Specifications 4 5 4 2 Multiple Analog Output Board Specifications 4 7 4 3 pH Probe Specifications 4 20 4 4 D O Probe Specifications 4 25 A 1 Replacement Parts List A 4 C 1 Hazardous Gases C 6 ...

Page 12: ...4250 Flow Meter Table of Contents x ...

Page 13: ...or service on the 4250 The manual is organized into five sections Section 1 Introduction operation and specifications Section 2 Keypad operation and programming for the flow meter Section 3 Installation and options application specific to the 4250 Section 4 Options and accessories available for all 4200 Series Flow Meters Section 5 Routine maintenance and minor service Following Section 5 are appe...

Page 14: ...ware Using Flowlink the 4250 has enough memory to store 40 000 data readings The optional 4200T Modem with speech capability is available to transmit stored data over telephone lines 1 2 Compatible Equipment The 4250 Flow Meter may be used with the following equipment Manufactured by Teledyne Isco 3700 Series Sequential Composite and Refrigerated Samplers 6700 Series Portable and Refrigerated Samp...

Page 15: ...tors for other equipment used with the 4250 are on the right side of the flow meter s case 1 4 Area Velocity Sensor Operation The AV sensor is mounted beneath the surface of the flow stream and measures liquid level by responding to changes in hydro static pressure against a solid state pressure transducer It mea sures average velocity ultrasonically by using the Doppler effect This principle stat...

Page 16: ...unbalance in the current across the bridge that is proportional to the increase in pressure caused by a rising level in the flow stream This bridge is fed from a con stant voltage source so any change in its output is a result of hydrostatic pressure against the transducer 1 5 Three Sensors Available Teledyne Isco offers three types of AV sensor for use with the 4250 The 10 foot standard unit is i...

Page 17: ...or is designed to avoid accumulating debris that could affect readings In rare instances however debris may accumulate inside the opening containing the pressure transducer and cause it to give false readings In such cases you may need to remove the probe and clean it Figure 1 3 Low Profile Area Velocity Probe Figure 1 4 Operation of the Area Velocity Sensor Low Profile Sensor Particles or Air Bub...

Page 18: ...uc tions can be found in Section 5 Maintenance For more infor mation about installing software upgrades in the 4250 Flow Meter contact your Teledyne Isco representative or call the factory 1 7 Controls Indicators and Connectors The controls indicators and connectors of the 4250 Flow Meter are listed in Table 1 1 and their functions are briefly described Refer to Figure 1 5 for a view of the connec...

Page 19: ...r Input E Event Mark Input F Inhibit Enable Output A 12V B Ground C SDO D Rain Gauge Input A 12V B Ground C Sense Line D SDO E SDI F Analog Output Pulse A Channel 1 Red B Channel 3 Green C Channel 1 White D Channel 2 Brown E Channel 3 Black F Channel 2 Blue A 12V B Ground C Input Signal D Temp E Temp F Switched 12V G Input Signal C Ring B Tip or Analog Output Area Velocity Probe A 12V B Ground C L...

Page 20: ...pler 6 pin male M S Connects flow meter to sampler Provides 12V flow pulse to sampler pulse width 78 ms Receives sampler bottle number composite sample and event mark signal Rain Gauge YSI 600 Sonde 9 pin female M S Custom Connects flow meter to a Isco Rain Gauge or YSI 600 Multi Parameter Sonde Also provides output to High Low Alarm Relay Box Interrogator 6 pin female M S Provides serial data in ...

Page 21: ...ding Span Chart Resolution Display Resolution User selected from 1 4 ft 3 6 cm to over 30 ft 9 1 m with multiple over ranges 1 240 of selected recording span 0 001 ft 0 3 mm Paper 4 5 wide 58 ft 11 4 cm 17 7 m plain white paper replaceable Printer Reliability 2 5 million lines MCBF mean cycles before failure Reports Printed Program selections interval activity reports flow meter history Printer Re...

Page 22: ... 0 015 to 9 14 m Maximum Allowable level Standard Range Extended Range 20 ft 6 1 m 40 ft 12 2 m Level Measurement Accuracy Standard Range Extended Range 0 033 to 5 0 ft 0 008 ft ft 0 01 to 1 52 m 0 008 m m 5 0 ft 0 012 ft ft 1 52 m 0 012 m m 0 05 to 15 0 ft 0 03 ft 0 015 to 4 57 m 0 009 m 0 05 to 21 0 ft 0 09 ft 0 015 to 6 40 m 0 027 m 0 05 to 30 0 ft 0 30 ft 0 015 to 9 14 m 0 090 m 77 F 25 C Incl...

Page 23: ... F 40 to 71 Level Measurement Range 0 033 to 10 0 ft 0 01 to 3 05 m Maximum Allowable level 20 ft 6 1 m Level Measurement Accuracy 0 033 to 5 0 ft 0 008 ft ft 0 01 to 1 52 m 0 008 m m 5 0 ft 0 012 ft ft 1 52 m 0 012 m m Accuracy per foot of change from calibrated depth 77 F 25 C Includes non linearity and hysteresis Temperature Coefficient 0 0023 ft F 0 0013 m C Maximum error within operating temp...

Page 24: ... temperatures and component differences Minimum settings are those providing the lowest average current draw Maximum settings are those requiring the highest current draw Your program should draw somewhere between the two It is not possible to calculate the current draw for every possible program com bination 2 The default settings are the program entered at the factory You can reset the flow mete...

Page 25: ...ean that you can expect to draw 4 amperes from the nickel cadmium battery or 6 5 amperes from the lead acid battery for one hour At the one hour rate discharges are typically less than half the ten or twenty hour rate To convert ampere hours to milliamperes multiply by 1 000 Examples 4 ampere hours 1 000 4 000 mAh 6 5 ampere hours 1 000 6 500 mAh If you divide this figure by the average current of...

Page 26: ...cannot simply measure the idle current of the unit unless the printer and report generator are turned off in the program These func tions require power periodically but not all the time If the figures given in the previous table are not satisfactory for your application you can use the following procedure shown in Figure 1 6 to measure the actual current draw Note Do not attempt this procedure unl...

Page 27: ...his manual and any flow meter order Com Battery 12 Volt Flow Meter mA A A FLUKE 87 TRUE RMS MULTIMETER 00I5 mA A V Fluke 87 Connect Cable 60 1394 023 or other current averaging meter clip lead or you can make A good quality adjustable regulated DC power supply can be substituted for the 12 volt battery The power your own supply should have at least 3 Amperes output prefer ably more and capable of ...

Page 28: ...4250 Flow Meter Section 1 Introduction 1 16 ...

Page 29: ...acklight feature for easy viewing in low light sit uations The display has three different operating modes normal programming and messages In the normal mode the display shows such things as level flow rate total flow parameter measurement etc In the programming mode the top line of the display shows each step as you work through the program while the bottom line shows the choices available for th...

Page 30: ...ping Most steps not finished when you stop will return to the previous selection 2 1 2 Keypad Functions Programming is done on the flow meter s keypad with prompts from the display The following sections describe the function of each key OFF and ON These two keys turn the flow meter off and on Go To Program Step Pressing this key lets you go directly to a particular program step without passing th...

Page 31: ...ng this key lets you rewind the chart onto the take up roll Number keys These keys let you enter numeric values into the flow meter when programming Decimal Point This key lets you enter a decimal point into a numeric value when programming On flow meters equipped with the optional modem only you can use this character as a comma delay when entering dialout numbers Arrow keys These keys referred t...

Page 32: ...of step 3 Adjust Level Parameters To set level you must make an accurate mea surement of the level in the flow stream and then enter that value This can only be done at the job site If you are programming the flow meter for the first time gen erally you will press Enter start with step 1 and go on from there If the flow meter has been in use and you need to change only certain aspects of the progr...

Page 33: ... Mode determines how you set up the flow meter In this step there are two choices Program and Setup Program advances you to step 2 and from there on you cor relate the flow meter to the flow stream Setup selects various basic housekeeping features for the flow meter Here you determine the internal clock site identification measurement setup hysteresis report contents operation of the display back ...

Page 34: ... that equation into the flow meter and the flow meter will calculate the flow rate from that equation Area velocity flow conversion is the customary flow con version used with the 4250 The area velocity sensor measures both the level of the flow stream and the velocity at which the liquid is moving It uses ultrasonic reflection to measure the velocity and a pressure transducer to measure the level...

Page 35: ...or its slope and internal roughness serves as the primary device The 4250 Flow Meter can calculate flow in round pipes rectangular U shaped or trapezoidal channels based on this formula Data Point Flow Conversion DATA POINTS calculates flow based on a set of user entered data points for a flow stream Data consist of correlated level and flow measurements for the stream Like the Equation method of ...

Page 36: ...ur flow meter to use this system contact the factory Note that you can have both the YSI 600 Sonde and the Rain Gauge connected to the flow meter at the same time by using a special Y connect cable The YSI 600 Sonde can measure the following water qualities dissolved oxygen D O conductivity temperature and pH Conductivity measurements made by the sonde can be used to calculate specific conductivit...

Page 37: ...per ature rainfall if you are using the optional rain gauge sensor D O dissolved oxygen or pH You can also use a pair of condi tions or if you are using the YSI 600 sonde you can select mul tiple conditions from its sensors Note If you choose CONDITIONAL for sampler pacing and it doesn t seem to work properly for you read the section on hysteresis Then check the hysteresis setpoints for your condi...

Page 38: ...xygen pH rate of change a combination of conditions or define the operation through Flowlink software from another computer STORM lets you set the alarm through a combination of rainfall and time You can also program the interval between calls and set up the system to reset the alarm condition by dialing back from the remote telephone 2 3 8 Step 8 Printer All 4250 Flow Meters have a built in print...

Page 39: ...nd 200 sample events at a time 2 4 Interpreting the Program Screens Following are the program screens as they appear on the display of a 4250 Flow Meter Explanations of most of the screens will be provided Note Some items that appear in the menus have parentheses around them This means that the item may or may not appear on your flow meter Choices made from the beginning of the program will make s...

Page 40: ...wing will appear You will have to use the right arrow key to bring all the options on screen LEVEL READING INTERVAL refers to how often the flow meter takes a level reading LEVEL refers to the level in the flow stream SETUP OPTIONS EXIT TO QUIT STATUS ENABLE ALARM HYSTERESIS SETUP OPTIONS EXIT TO QUIT OPTIONAL OUTPUTS REPORT SETUP SETUP OPTIONS EXIT TO QUIT LCD BACKLIGHT LANGUAGE PROGRAM LOCK SETU...

Page 41: ...s If your installation is AC powered you can simply select CONTINUOUS Consid erable power is expended in generating the ultrasonic pulses in the level sensor Select the longest acceptable interval between readings if oper ating on battery power If you need a faster response time select one of the shorter intervals If operating on battery power you may have to seek a compromise between short readin...

Page 42: ...o not have a program selection for minimum depths Low profile sensors attempt to measure velocity regardless of depth Typically a low profile sensor provides error free velocity readings to depths as low as 1 inch 25 mm Note The MINIMUM DEPTH setting will only appear if you are using a standard 10 ft or 30 ft AV probe This setting will not appear if you are using a low profile AV probe The standar...

Page 43: ...n error measurement The object is to select the option that gives you the greatest overall accuracy Selection of YES will make the 4250 register zero flow until the next valid measurement can be made Selection of NO will make the flow meter continue to use and display the last valid mea surement prior to the ERROR reading An error measurement does not necessarily mean that there was actually no fl...

Page 44: ...flow meter If you press Enter again you will see the following display This value indicates the functioning of the area velocity sensor The flow meter goes into the continuous reading mode whenever this screen is displayed This display exists primarily as a diagnostic tool for telephone troubleshooting There is no magic number you should expect to see If the flow meter is displaying valid level fl...

Page 45: ...e reading to the next By contrast numbers that vary widely from one reading interval to the next are indications of an unstable installation and you should recheck the level flow measurement If you press Enter again the flow meter will display the system voltage This value should be from 10 5 to 13 5 volts DC Note that if you do not press Enter after the first diagnostic menu appears the flow mete...

Page 46: ...e next three menus may or may not appear depending on other selections you make in Program They concern alarm enable hysteresis set points for parameter sensing tem perature pH D O and the YSI 600 Sonde outputs If you want to set hysteresis for any of these items you should enable them when you work through the program section then re enter the Setup section Hysteresis and they will appear Note th...

Page 47: ...at 20 mA the control is completely turned on 100 In between rates range from 1 to 99 A typical application is a chlorinator which must vary in application of the chlorine gas as the amount of water passing through the system increases or decreases Current ranges other than 4 20 mA are also in use although they are less common than 4 20 mA Examples are 0 20 mA sup ported by the flow meter on the in...

Page 48: ... output Keep in mind that programming choices also affect power consumption Use minimum settings on the flow meter wher ever possible See Section 1 Table 1 6 Even with these circumstances you may expect significantly shorter charge life from your battery To determine the effect of this extra current draw on battery life please refer to the sec tion How to Make Battery Calculations at the end of Se...

Page 49: ...rom the ANALOG OUTPUT menu the following will appear This option lets you control the operation of a 4 20 mA loop to check the operation of equipment controlled by the loop at any level from 0 to 100 After connecting a 4 20 mA output to a con trolled device you can program the flow meter to put a specified current on a specific analog output If you are using the external 4 20 mA converter the Anal...

Page 50: ...nd response protocol The following table provides the ASCII codes for port types and standard units of measure Table 2 1 ASCII Output Codes Code Parameter Units DE Description String ID Unit specific identifier Unsigned long MO Model String TI Time since 1900 Days BV Battery Voltage Volts LE Level Meters LSI Level Signal Strength 0 100 FL Flow Cubic meters per second VO Volume Cubic meters FV Forw...

Page 51: ...00 The supported baud rates are 9600 4800 2400 and 1200 no parity eight bits and one stop bit Periodic Output Use a special RAIN GAUGE connector cable contact the factory for assistance The periodic output will ter minate during phone connection and when the interrogator cable is connected Note It is important to use CHECKSUM if you plan to use internal modems or the interrogator The UART is share...

Page 52: ...2 1955 39 SS 1 B0 35317 307384 B0 35317 269907 B0 35317 2325 93 CS 10819 If you select any of these outputs the flow meter will request that you turn them on or off If you are running on battery and do not need these options select OFF Otherwise select ON After the OPTIONAL OUTPUTS menus have been set press Enter The display will return to the SETUP menu The alarm box also called the High Low Alar...

Page 53: ...ort then press Enter The following will appear Select YES if you want FLOW RATE to appear in the report then press Enter again Then Select YES if you want RAINFALL to appear in the report Note that you must have a rain gauge connected to the flow meter to sense rainfall occurrence Press Enter The following will appear FLOW METER HISTORY is off the screen to the right Select DO PH Press Enter The f...

Page 54: ...ng will appear Select YES if you want FLOW METER HISTORY to appear in the report FLOW METER HISTORY is a list of the changes that have been made to the flow meter s program Press Exit to leave the program Then press Enter and reselect SETUP The Setup menu will reappear SET CLOCK SITE ID MEASUREMENT SETUP PROGRAM LOCK PROGRAM are off screen and can be reached with the arrow keys Select LCD BACKLIGH...

Page 55: ...se it Do not use CONTINUOUS in any installation that is battery powered as it will cause rapid dis charge of the battery OFF will keep the backlight feature turned off under all circum stances Select this option for maximum battery life in installa tions where there is sufficient ambient light to read the display without the backlight feature Press Enter The SETUP menu will return This time move t...

Page 56: ...rogram a parameter value as a condition for sampler enabling pacing dialout etc and then turn that parameter sensor off the flow meter will also remove that condition from the program Consider all aspects of your program before you make any changes Press Enter The following will appear Selection of feet inches meters or mm depends on your situ ation You would select NOT MEASURED if you were using ...

Page 57: ...ntage of the capabilities You can only have D O temper ature pH temperature or temperature alone on a given flow meter unless you use the YSI 600 Sonde The YSI 600 Sonde pro vides multiple outputs simultaneously You can use the Rain Gauge with the YSI 600 sonde if you use a Y connect cable The pH or D O probes do not attach directly to the flow meter as their output signals are very low You must a...

Page 58: ...l appear for the rest of the program If you select pH you will be unable to measure D O and references to D O will not appear on the rest of the program If your situation requires the measurement of both parameters pH and D O at the same time or if you also need to measure conductivity you should use the YSI 600 Multi Parameter Sonde If you select NOT MEASURED and press Enter the following will ap...

Page 59: ...s with 4 pin Rain Gauge connectors cannot support the YSI 600 It is necessary to return the flow meter to the factory for modifications if you wish to use a YSI 600 Sonde In addition to the connector there are significant inter nal modifications to the flow meter s electronics and software You can use both the YSI Sonde and a Rain Gauge on flow meters that support the YSI with a special Y connect ...

Page 60: ...e YSI 600 sonde s pH measurement capability select pH If you do not select NOT MEASURED If you wish to make use of the YSI 600 sonde s D O measurement capability select MG L Otherwise select NOT MEASURED For any of the YSI CONDUCTIVITY options if you press Enter the following display will appear This value is provided because conductivity rises 2 C with temperature The default setting is 1 91 This...

Page 61: ...te Accurate measurements of both area and level are essential for accurate flow compilation See Section 3 6 Area Velocity Sensor Installation The 4250 can calculate flow either through area velocity mea surements and area velocity data points or through level to flow rate conversions using a standard primary measuring device or level to flow rate data points If you wish to use the 4250 with a prim...

Page 62: ...ar In general the option of NONE will not show up on the display For the 4250 you can define the four sets of data points as either level to flow rate data points or level to area data points Level to area data points are used in 4250 applications where the channel has an unusual or non standard shape If for example you had defined all four sets as level to flow rate sets and then wanted to define...

Page 63: ...NITS option will disappear from the screen You cannot change the units of measure after you have begun a set Other units of measure may appear depending on what you chose previously Enter values appropriate for what you have measured When you have entered all the points for a data set press Exit The fol lowing will appear USE will not appear until you have entered at least four points USE EDIT POI...

Page 64: ...w calculation is based on this value 2 4 5 Step 2 Flow Conversion Level to Flow Rate Use this flow conversion only if you do not wish to calculate flow from area and velocity Normally the 4250 is used in area velocity installations This selection allows you to use the 4250 with a primary measuring device Manning applications a custom flow equation or data points WEIR FLUME weir or flume EQUATION e...

Page 65: ... you select PARSHALL the following will appear If you press the right arrow key several times the sizes shown below will move onto the screen If you select PALMER BOWLUS this will appear SELECT TYPE OF WEIR V NOTCH RECTANGULAR CIPOLLETTI SELECT V NOTCH WEIR ANGLE IN DEGREES 22 5 30 45 60 90 120 END CONTRACTIONS ON RECTANGULAR WEIR YES NO RECTANGULAR WEIR WITH END CONTRACTIONS ENTER CREST LENGTH XX...

Page 66: ...NVERSION If you select EQUATION the following will appear This step allows you to enter an equation that is appropriate for your flow situation The equation is expressed in the general form of Q k1HP1 k2HP2 where Q flow rate k1 a constant H level or head and P1 is the power to which H is raised k2 and P2 are a second constant and power found in some equations If your equation has only one term you...

Page 67: ... the material the pipe is made of The roughness coefficients are published for all common materials in three grades minimum normal and maximum Then If you select U CHANNEL for the Manning flow conversion the following displays will appear Slope and roughness are entered as for ROUND PIPE previ ously Then If you select RECTANGULAR for the Manning flow conversion the following displays will appear S...

Page 68: ... will appear on the display GPM gallons per minute GPS gallons per second MGD million gallons per day CFS cubic feet per second CFM cubic feet per minute M3S cubic meters per second M3M cubic meters per minute M3H cubic meters per hour M3D cubic meters per day LPS liters per second CFD cubic feet per day GPH gallons per hour AFD acre feet per day CFH cubic feet per hour MANNING RECTANGULAR WIDTH X...

Page 69: ...e the flashing cursor with the right arrow key USE will only appear after four points have been entered USE tells the flow meter that the set is com plete and can be used for the flow rate calculation Select EDIT POINT if you need to change either the level or the flow value for a particular data point Select ADD POINT if you want to add another point to a data set CLEAR will erase an entire set o...

Page 70: ...rn on any of the 4 20 mA outputs ANALOG OUTPUTS in step 1 Setup programming the actual operation of the output appears in step 2 Select Flow Conversion For each 4 20 mA output port turned on the flow meter will request entry of the type of data that will drive the output along with minimum and maximum values Here is an example of what you might see for programming analog output 1 TEMPERATURE DISSO...

Page 71: ...00 Multiple Parameter Sonde Note that there is no calibration step for the temperature sensor because it does not need calibration When you select step 3 the following will appear LEVEL will not show up if you are using the flow meter only for parameter sensing Likewise pH and or D O and YSI 600 will not show up on the display if you have locked them out by pro gramming selections you made in step...

Page 72: ...ll be based on these measurements If the values entered are incorrect even by relatively small amounts all subsequent flow calculations will also be incor rect For example an error of only 1 4 for a 3 level and 1 4 for a 10 diameter round pipe can result in a combined error of over 14 Errors in level measurement have a greater effect on flow cal culations at low liquid levels Dimensional errors te...

Page 73: ...the fol lowing will appear Absolute barometric pressure is barometric pressure not corrected to sea level The barometric pressure published by the U S Weather Bureau is adjusted to sea level If you use their value you must convert it to the absolute pressure for your altitude You should use Weather Bureau barometric pressure only if you are at sea level or are able to correct the Weather Bureau fi...

Page 74: ...n the pre ceding section for the Isco pH sensor Select the calibration that best suits your stream s profile When you complete the pH cali bration successfully the following display will appear Returning to the YSI menu if you select D O ALTITUDE is just off screen to the right Programming for YSI 600 D O is essentially the same as that described for the Isco D O sensor on the preceding section wi...

Page 75: ... and that term may be more familiar to some PPT is parts per thousand Select the standard most suitable for your application Then Then If you select PPT for the conductivity standard Then Then There is no need to calibrate the YSI 600 temperature sensor as it is self calibrating CONDUCTIVITY CALIBRATION UNITS MS CM PPT CONDUCTIVITY STANDARD X XX MS CM PLACE PROBE IN X XX MS CM PRESS ENTER WHEN STA...

Page 76: ...n in g Er ror Wa rnin g Error Wa rn in g Error Wa rn in g Error Wa rn in g E rror Wa rnin g G ood Cali brat ion G ood Cali brat ion Good Cal ibrat ion Good Cal ibrat ion G ood Cali brat ion Good Cal ibrat ion No No No No No Ye s Ye s Ye s Ye s Ye s Calibrating Please Wait Calibrating Please wait Calibrating Please wait Calibrating Please wait YS I 600 Parameter To Calibrate None Ph Conducti v ity ...

Page 77: ...ler enabling Then 2 4 8 Step 5 Sampler Pacing If you select step 5 the following will appear This step determines how the flow meter will signal an asso ciated automatic wastewater sampler to take a sample The flow meter and sampler must be connected together with a cable The flow meter sends flow pulses to the sampler The sampler uses these flow pulses as counts When an appropriate number of flow...

Page 78: ...previous programming selections At least one of these options will be available to you Pressing the right arrow key may be necessary to bring all items onto the display provided they are available for use LEVEL will only appear if the flow meter is set up to measure level or flow RAINFALL D O pH and TEMPERATURE measurement require the appropriate sensor probe be used with the flow meter Remember t...

Page 79: ...the condition and then identify what change in LEVEL would be the trigger Then you would select DONE for the SELECT OPERATOR step Selection of DONE will advance the flow meter to the next program step However suppose you wanted to select two conditions either of which would trigger the sampler In such a case you would select OR for the SELECT OPERATOR step The menu will return to the one listing t...

Page 80: ...ep or if you are using Flowlink until it is over ridden by a command from Flowlink Select the DISABLE option with care it will make the sampler appear to be inoperative and that could easily be misinterpreted as an equipment failure ENABLE means that the sampler is permanently enabled free to run its own program without any control from the flow meter This condition will remain until you change th...

Page 81: ...program At least one of the conditions will be available to you Operation of the conditions is the same as for step 5 Sampler Pacing If you select LEVEL from CONDITION the following will appear After you select one of these options the flow meter will request that you enter a value for example if you selected GREATER THAN Enter a maximum value for the selected condition which if exceeded will enab...

Page 82: ...e activation in step 1 and use of the appro priate sensor Only one parameter condition pH D O can be measured by the flow meter at a time pH and D O will not appear on the display at the same time It is possible to program the sampler enable option so that it operates in two different modes latching and non latching To explain this in the non latching mode the sampler will be enabled only as long ...

Page 83: ... of this feature This menu will not even appear if you do not have a modem The flow meter will automatically advance to the next step More information about the modem can be found in Section 4 If you have the modem installed and select step 7 the following will appear If you select DISABLE this option will be inactivated until you change the selection later The program will advance to the next ste...

Page 84: ...ate sensor to the flow meter D O and pH will never appear together as only one can be used at a time When you have selected the condition you want the display will advance to the following For these conditions you enter an amount which if exceeded GREATER THAN or if dropped below LESS THAN or if changed too quickly RATE OF CHANGE will activate the alarm dialout For RATE OF CHANGE you enter two val...

Page 85: ...lue between 1 and 99 minutes Then the display will advance to the following Select YES if you want to be able to acknowledge the alarm con dition in the flow meter by calling back No message is spoken on this callback When the flow meter s modem detects the ring it will answer and automatically reset the alarm If there is no one available to answer an alarm you can have the flow meter dial a pagin...

Page 86: ...o previous program selections Either pH or D O may appear but not both The various YSI options will only appear if you enabled the YSI 600 in step 1 You must have the appropriate probes to sense these conditions Select OFF if you do not need this line If you select pH D O TEMPERATURE or any of the YSI options the flow meter will request that you set limits that will serve as the bottom of the char...

Page 87: ...er will again request a full scale value The full scale value can be different from that of line A TEMPERATURE YSI pH YSI D O YSI SALINITY and YSI TEMP may also appear For line C you can select yet another condition to plot on the chart The flow meter will again request entry of a full scale or bottom and full scale value You must have an Isco Rain Gauge or equivalent connected to the flow meter t...

Page 88: ...F for this step the program will advance to the next step and there will be no report B generated If you select YES the following will appear Select the appropriate interval for this second report After you select the units of time the following will appear DAYS or MONTHS could also appear depending on what you selected for the previous step The time selected becomes the time interval that will be...

Page 89: ...T FLOW METER HISTORY the flow meter will advance to CLEAR HISTORY YES NO If you select NO again the flow meter will exit programming and return to the normal display If you clear the memory previous programming changes will be erased but the flow meter will again begin keeping track of changes the next time you change the program 2 4 13 Flow Meter History Contents D O ADJUSTED pH ADJUSTED LEVEL AD...

Page 90: ...4250 Flow Meter Section 2 Programming 2 62 ...

Page 91: ...with little holes in it Open the flow meter case lid Note the small clamp that resembles a bottle cap opener located near the bottom right hand corner of the case lid Install the des iccant canister by pressing it under this bracket with its viewing window lined up with the circular hole in the bracket Make sure the clamp is fully engaged over the canister The par ticles inside the desiccant windo...

Page 92: ...rence port on the AV sensor are varied Noticeable drift in measured level when you know the level is essentially constant or an oscillation in the level corre sponding to changes in barometric pressure are two indicators of clogging in the reference port tube If dirt and or moisture block the reference tube between the des iccant cartridge and the AV sensor connector on the flow meter you may be a...

Page 93: ... 3 2 1 Low Power Indication When power to the flow meter falls too low for the unit to operate properly the message POWER LOST LOW BATTERY will appear on the top line of the display When power is lost or falls below operating limits the flow meter will stop measuring level the display will go blank and the internal printer will not be able to print However the internal battery backed RAM will reta...

Page 94: ...k to power the flow meter Teledyne Isco packages this battery specifically for use with Isco flow meters and samplers Refer to the Power Products Guide accom panying this manual for detailed information about this battery and the procedure for charging it Attaching the Nickel Cadmium Battery Install the battery on the top of the flow meter case and attach its connector to the 12 VDC connector on t...

Page 95: ...If your flow meter is permanently installed you may need to allow extra clearance above the flow meter for the slightly greater height of this battery CAUTION Do not test either lead acid or nickel cadmium batteries for the condition of charge by sparking the output shorting the ter minals together with a wire screwdriver or other tool 3 2 5 AC Power Supplies Teledyne Isco also offers two differen...

Page 96: ...2 VDC source such as an automotive motorcycle or marine battery Many people have found that a deep cycle marine RV battery is particularly well suited to this application However you will have to mount batteries of this type externally as they are too large to fit on top of the flow meter Teledyne Isco offers a special optional connect cable to power the flow meter from a separate battery Mount th...

Page 97: ...d location and route the AV sensor cable to the place where the level sensor is mounted For example you can install the flow meter above ground for protection and easy accessibility and then you only need to enter the manhole for sensor installation and calibration and occasionally thereafter for maintenance and inspection You will need to mount the unit within 25 feet 7 6 m or 50 feet 15 3 m with...

Page 98: ...n of the flow meter Vinyl tubing can be pur chased locally or from Teledyne Isco If you use the Quick Disconnect Box to extend the distance between the flow meter and the sensor attach the vinyl tubing to the desiccator cartridge vent on the Quick Disconnect Box rather than the vent on the flow meter Presumably the flow meter is mounted safely away from the flow stream if you are using the Quick D...

Page 99: ...Area Velocity Sensor To use the Quick Disconnect box you will need a cable of the correct length with an M S connector to plug into the flow meter Teledyne Isco will build the cable with the proper connector on one end and stripped wires on the other end as a special order You should power the flow meter from AC if you must use the Quick Disconnect Box especially if you need to run the full 1 000 ...

Page 100: ...it you must install a com pression bushing on the cable to make a water tight connection A picture of the compression bushing is on the next page If you run the wiring inside conduit liquid tight fittings are needed To min imize the effects of corrosion we suggest the use of non metallic conduit if permissible The desiccant cartridge on the bottom of the Quick Disconnect Box provides the atmospher...

Page 101: ...an two extension cables together to exceed the 75 foot limit 100 ft for the 30 ft sensor Increasing the length of the vent tube beyond 75 feet slows the response of the pressure transducer and this may cause measurement errors For greater distances use the Quick Disconnect Box and a custom built cable Figure 3 6 Assembling a Compression Bushing The AV sensor uses a differential pressure transducer...

Page 102: ...d and if damaged cannot be opened for repair The standard AV sensor accurately detects levels above approximately 0 1 foot 30 mm and velocities for streams with a minimum depth of 2 4 inches 50 100 mm This value is selected in programming See Measuring Minimum Depth on page 2 14 Below the minimum depth velocities are approximated based on previous measure ments Although the standard sensor can mea...

Page 103: ...er level or velocity if the flow stream falls below the sensor 3 6 1 Level Measurement in Open Channels No Primary Device When measuring level to calibrate an area velocity installation keep in mind the following Make the measurement as accurately as possible Measure the level at a point inside the ultrasonic cone extending upstream from the AV sensor Measure level in an area of stable flow This m...

Page 104: ...the mounting strap may cause a jump or localized rise in the level If you cannot measure upstream after instal lation of the sensor and strap measure the level before installing the sensor Do not measure downstream from the sensor If the level is low enough that you can see a visible jump or dis turbance in the liquid surface where it flows over the sensor and mounting ring you should measure the ...

Page 105: ...nches 6 Inches 6 Inches The flow in this 10 round pipe is uni form The ideal level measurement point is always within the ultrasonic cone point C but it is not easily accessible In this example level mea surement at point A is acceptable due to the uniform flow Note Not drawn to scale Depths in all three examples are to show flow char acteristics of each channel The flow in this 10 round pipe is n...

Page 106: ... Isco offers the Scissor Rings Universal Mounting Rings Area velocity sensors can also be installed using primary measuring devices 3 8 1 Spring Rings To install a spring ring you compress the ring slip it inside the pipe and then allow it to spring out to contact the inside diameter of the pipe The inherent outward spring force of the ring firmly secures it in place A typical self expanding mount...

Page 107: ...hown in Figure 3 9 Other routing directions may affect measurement accuracy The cable can actually create a stilling well downstream from the sensor causing the level to read low Use the self locking plastic ties supplied with the ring Install the ring in the pipe by compressing it Press inward on both sides and slide the ring into the pipe Route the sensor cable out of the stream and secure it in...

Page 108: ...e suf ficient to simply increase the outward spring force of the ring by bending it into a less round configuration 3 8 2 Scissors Rings For pipes larger than 15 in diameter Teledyne Isco offers the adjustable Scissors Ring also known as the Universal Mounting Ring This device consists of two or more metal strips that lock together with tabs to form a single assembly There is a base section where ...

Page 109: ...here the sensor cable leaves the mounting apparatus and the location of the flow meter be sure to attach the cable to the flow stream wall to prevent it from vibrating moving around tangling or possibly collecting debris CAUTION Under no circumstances should you leave any extra length of sensor cable dangling freely in the flow stream where it could trap debris or become tangled Use gloves and eye...

Page 110: ...ying flow rates The 4250 Flow Meter may be used with any of the Isco Wastewater Samplers listed in Section 1 An optional 25 foot 7 6 m long connect cable is available to connect the flow meter to the sampler Attach the six pin female connector on the cable to the Sampler connector on the side of the flow meter This is the second connector from the top Attach the connector on the other end of the c...

Page 111: ... Output Interface alarm box rain gauge and parameter probes are options you can field install any time The modems require factory modification to the flow meter and you should specify these options when you order If you want to add any of these later you will need to return the flow meter to the factory 4 1 4200T Modem The 4200T Modem is a circuit board installed inside the flow meter that transmi...

Page 112: ...dem to the phone line This equipment complies with part 68 of the FCC rules On the case of this equipment is a label that contains among other information the FCC registration number and ringer equivalence number for this equipment If requested this information must be provided to the tele phone company This equipment uses the following USOC jacks USOC RJ11C The REN is used to determine the quanti...

Page 113: ...he cable connects the flow meter s Modem connector to a standard telephone jack type USOC RJ11C supplied by the phone company You must mount the flow meter within 12 feet of this jack We are required by the FCC to provide the following notice This equipment generates and uses radio frequency energy and if not installed and used properly in strict accordance with the manufacturer s directions may c...

Page 114: ... data such as a video display terminal or a printer The specifica tions for this serial data output are as follows 300 baud 7 data bits 2 stop bits even parity The printed or displayed line con tains 110 characters and will appear similar to the following 01 409F 100 00 2 500 0 CFS 0001533 0 CF 00 00 90 DEGREE V NOTCH WEIR 000 0 90 04 04 02 31 48 The last two characters not displayed are a CR carr...

Page 115: ...h ends This cable connects the input of the 4 20 mA Output Interface to the flow meter Interrogator connector The other cable has a three pin plug on it that connects to the output connector of the 4 20 mA Output Interface This cable ends in three pigtailed wires you connect to the equipment you want to control with the 4 20 mA Output Interface Table 4 1 4 20 mA Output Interface Specifications Pow...

Page 116: ... the following to extend battery life Use a Solar Panel Battery Charger Use a larger battery either a commercial deep cycle marine type or an Isco 55 Ampere hour lead acid battery Order only one analog output Flow meter program choices also affect power consumption Use minimum settings if possible See Section 1 Table 1 6 and Section 5 The outputs from the analog output board are electrically iso l...

Page 117: ...rther adjustments necessary Maximum output distance 1500 feet 457 3 m using 18 AWG wire Current Range per loop 0 to 20 mA Maximum Load per loop 750 ohms Analog Output 1 Terminations Pin A Red wire Pin C White wire Analog Output 2 Terminations Pin D Brown wire Pin F Blue wire Analog Output 3 Terminations Pin E Black wire Pin B Green wire Note If you must strip the cable further back to facilitate w...

Page 118: ...pler must have its own external power NEVER connect the sampler and flow meter to the same power source CAUTION Do not use the standard Isco Y cable 60 3704 081 with the Type E Interface This cable is designed for Isco sampler con nection only Use of this device requires a factory modification to the flow meter If you are connecting the Type E Interface to a previously purchased flow meter prepare...

Page 119: ...nents Turn to Section 5 7 1 for recommended precautions 1 Remove the four Phillips screws on the front panel Care fully pull the panel away from the case to access the inte rior 2 Remove the lower metal shield by sliding it downward freeing the tabs from their slots This exposes the power supply PCB Figure 4 2 Flow meter with front panel removed Lower shield ...

Page 120: ...hield 3 In the lower right hand corner of the power supply PCB disconnect the red wire s spade connector from J3 and con nect it to J1 Figure 4 4 Type E modification 4 Replace the metal shield and carefully reattach the front panel to the flow meter case Disconnect from J3 Connect to J1 ...

Page 121: ...d to provide a contact closure to the flow meter for every hundredth of an inch 0 01 or 0 1 mm of rainfall Software in the flow meter stores this infor mation in memory and prints the accumulated data as a text line on the printer chart It also allows the printout to be expressed in metric You may if you wish provide a rain gauge of your own choice but to ensure compatibility with the flow meter s...

Page 122: ...l box that monitors flow rate data available from any 4200 Series Flow Meter Alarm relays trip when the flow rate exceeds or falls below pre selected limits High and low set points are user set and range from 0 to 99 in 1 increments Output from the unit is the switching of form C SPDT relay contacts The unit has 2 relays one for high alarm and the other for low The availability of form C contacts ...

Page 123: ...a 4 pin male M S connector Plug this connector into the Remote Printer Rain Gauge connector on the flow meter The other end of the cable has 3 stripped wires Attach them to the alarm box according to the instructions in the alarm box instruction manual 4 8 Parameter Sensing with Isco 4200 Series Flow Meters Isco 4200 Series Flow Meters have the capability of displaying recording and if Flowlink so...

Page 124: ... temperature or pH with temperature If you want to change probes later you can but you will need to reprogram the flow meter Note that selection of either pH or D O in step 1 where units of measure are defined will lock out any mention of the other in the menus for the rest of the program The Parameter Modules themselves plug into the Parameter Probe connector on the flow meter CAUTION The pH and ...

Page 125: ... for a substance after it is dissolved in water Dissociation constants vary widely for substances depending on the nature of the substance s chemical bonds Ionic salts tend to have higher constants Each number on the pH scale between 7 and 0 equals a tenfold increase in H ion Each number between 7 and 14 equals a tenfold decrease of H ion pH measurements of wastewater are commonly made to monitor ...

Page 126: ...he probe to stray capacitance and reduces interference caused by electrical noise in the vicinity pH measurement is affected significantly by temperature like any other chemical reaction Consequently temperature compen sation is provided in the flow meter The Isco pH probe has a built in temperature sensor that is exposed for faster response The pH probe connects to a Parameter Module that plugs i...

Page 127: ...r trapped under the probe membrane or the reading may become incorrect and or erratic Do not touch the probe until after you have performed step 6 To calibrate the pH probe with the flow meter 1 Go to program Step 1 PROGRAM SETUP and select PROGRAM 2 Step through the units of measure with the Enter key until you reach the menu that says pH UNITS NOT MEASURED pH Select pH You must do this in step 1...

Page 128: ...slow to respond and finally stop working Never let the sensing end of the probe dry out completely Installation in streams with high grease content will result in poor performance and require frequent cleaning and recalibration Greasy substances being nonconductors of electricity weaken the electrical potentials formed between the glass mono electrode and the solution slowing or halting the respon...

Page 129: ... on the 201 module is for use ONLY with non Isco pH probes that do not have built in temperature sensing The Isco pH probe contains its own integral temperature sensor which if connected in parallel with a separate temperature probe will cause erroneous readings Figure 4 8 pH Parameter Module Note When installing the pH probe and its sensor carrier make sure the mounting slots on the carrier are c...

Page 130: ...be dry or without the cap in place The Isco amplifier box extends the allowable distance between the probe and the flow meter The probe has a 25 foot cable so you must mount the amplifier within this distance The maximum distance between the amplifier box and the flow meter is 1 000 feet 4 10 3 Storage and Maintenance of pH Probes If you remove the pH probe from operation be careful to keep the gl...

Page 131: ...he reference electrode in a 4 0 pH solution or tap water if the buffer is not readily available may bring the ref erence back to life Boiling the electrode in 4 0 buffer solution or tap water could revive the electrode in more severe situations If none of these solutions work it may be necessary to replace the probe 4 11 Dissolved Oxygen D O Probe This probe measures the amount of oxygen dissolved...

Page 132: ...g or no reading at all Cleaning the membrane is generally not effective as it tends to drive the solids further into the membrane pores You must usually replace both the electrolyte and the membrane to get an accurate reading In severe cases of fouling it may be necessary to change the membrane very frequently even as often as every other day 4 11 1 How the D O Probe Works A thin permeable membran...

Page 133: ...no bubbles under the membrane Note Handle the membrane material with care touching it at the ends only 4 Place the O ring on top of the membrane generally con forming to the circumference edge of the probe 5 Place the thumb and index finger from both hands opposite each other on the O ring at equal distances 6 Roll the O ring down over the end of the probe being care ful not to touch the membrane ...

Page 134: ...ncy of service Membrane life depends on use Membranes will last longer if installed properly and treated with care during use Contents of the flow stream are also important as some substances will foul the membrane very quickly Erratic readings will result from loose wrinkled or fouled membranes or from large bubbles in the electrolyte reservoir If erratic readings or evidence of membrane damage o...

Page 135: ...ent pack If the probe is not going to be in constant use you should store it in the plastic bottle provided in shipping To keep the electrolyte from drying out place a small piece of moist towel or sponge in the bottle and insert the probe into the open end If you need service for your D O probe Teledyne Isco recommends returning the unit for evaluation In addition to servicing the probe we can al...

Page 136: ...p cloth Wait ten minutes for it to stabilize then proceed Go to step 1 on the flow meter Select PROGRAM then step through the units of measure with Enter until you reach the menu for pH measurement Select NOT MEASURED Press Enter Then D O UNITS will appear Select either MG L or PPM Press Enter Exit the program and re enter going to step 3 You must select measurement of D O in step 1 or the D O men...

Page 137: ... Installation of Parameter Probes in Mounting Rings The parameter probes and their carriers snap onto Isco Spring Rings and the base section of Isco Scissors Mounting Rings You can also install them in other ways with custom hardware as is appropriate for your situation For information on the Spring Rings and the Scissors Mounting Ring refer to Section 3 8 4 13 The YSI 600 Multiple Parameter Sonde...

Page 138: ...uired no supplemental power supply or battery is needed and sensor drift caused by passive fouling is minimized The YSI 600 communicates with any 4200 Series flow meter equipped with suitable hardware and software Data can be exported through Flowlink software for further processing The YSI 600 connects to a modified 9 pin Rain Gauge Terminal on any 4200 Series Flow Meter Operation of the Rain Gau...

Page 139: ...ed in the front panel It must be ordered with the flow meter The totalizer advances according to program selections for units of measure and the maximum flow of the primary device used The totalizer is internally set to advance at 1 100 of the rate of the display totalizer Consequently you must multiply the number shown on the mechanical totalizer by 100 to determine the actual value for total flo...

Page 140: ...4250 Flow Meter Section 4 Options and Accessories 4 30 ...

Page 141: ...cabinet door form a seal when the door is closed Keep this seal free of dirt sand etc If it isn t clean it carefully with a damp cloth Also keep the rubber gasket in the lid clean You can clean it with a small brush and a damp cloth If you do any cleaning while the case is open be careful not to let any dirt or debris fall inside the flow meter assembly It is best to work on the flow meter with th...

Page 142: ... silica gel SiO2 in the desiccant tubes and canisters One looks like small beads or pellets that are blue black when dry pale pink to transparent when saturated The other looks like coarse sand yellow when dry dark green when saturated Regenerate silica gel before all the desiccant in the tube turns pink or green by heating Another type of desiccant may be used in the tubes anhydrous calcium sulfa...

Page 143: ...esiccant is dry As the desiccant absorbs moisture the window will turn pale pink or green When the window is pink or green you need to regenerate the desiccant or replace it with the spare canister provided in the flow meter accessory package Remove the canister from the flow meter by pulling outward on the spring clamp releasing its hold on the canister Remove the canister and heat it in a vented...

Page 144: ...astic and will melt 6 Refill the cartridge with the regenerated desiccant or with the extra desiccant provided in the accessory package 7 Replace the end caps Notice the foam filters in the end caps they keep small pieces of the desiccant material from falling out of the cartridge You can clean these filters from time to time using ordinary dish soap and water then allow to dry Note Regeneration o...

Page 145: ...assembly or sub ject it to any physical abuse 5 3 1 Low Maintenance The pressure transducer the ultrasonic transducers and the electronic components of the area velocity sensor are encapsu lated in plastic resin and are not user serviceable If any part of the sensor fails contact the Teledyne Isco Service Department It may be beneficial to periodically clean the flow stream up and downstream from ...

Page 146: ...er thin metal diaphragm of the pressure transducer Do not touch the diaphragm with fingers or tools 6 Gently flush with water without training the stream directly into the cavity Forcing water or air directly against the diaphragm can ruin the probe Figure 5 2 Standard AV Probe with Mounting Plate Figure 5 3 Standard AV Probe Protective Disk Exposed 5 3 3 Cleaning the Low Profile AV Probe The low ...

Page 147: ...so they are not at risk of damage result ing from other activity taking place in the area In temporary installations do not leave cables lying around where they may be run over by heavy equipment Do not leave extra cable loose in the flow stream where it can tangle and trap debris In permanent installations cables repeatedly subjected to rough environments will fail and should be installed in cond...

Page 148: ...ke up roll 2 Pull straight out on this handle until the take up roll slips off the printer 3 Remove the paper roll from the take up spool by holding the handle in one hand with your thumb pressed against one of the slots in the white end cap 4 Snap the white end cap free from the two black catches on the end of the spool 5 Pull the paper roll off the spool with your other hand END CAP REROLL SPOOL...

Page 149: ...aper and set the roll on top of the cabinet 7 Use your fingers to feed the paper down the back of the internal printer to where it touches the roller Make sure the paper gets past the lever for the paper sensing switch 8 Press the Chart Advance key and hold it until the paper comes through the printer mechanism 9 When the paper comes through reinstall the feed spool with the new roll on it by snap...

Page 150: ...it pull out the take up spool and unroll enough paper to get it out of the way so you can clearly see the two ribbon spools Each spool has a rib bon detecting lever pressing against the ribbon Note the direction the ribbon leaves the left spool and how it winds onto the right spool 3 Take hold of one of the spools and rotate it slightly loosen ing the ribbon 4 Hold the detecting lever away from th...

Page 151: ...holding on to any part of the printer The internal printer contains no user serviceable parts other than the paper and the ribbon If the printer needs service Teledyne Isco recommends you return the flow meter to the factory 5 5 Servicing And Troubleshooting The remainder of this section provides servicing information and a general troubleshooting guide This information will help you decide whethe...

Page 152: ...binet you can locate and change fuses The fuses are located on the printed circuit board directly behind the keypad There is an aluminum cover over this board Remove the cover by pressing against its surface with the palm of your hand and then pulling downward on it with your fingers A plastic catch under the cover holds it in place The fuses are labeled F1 F2 and F3 The proper size for each of th...

Page 153: ...appear to be operating normally you can try to restart the processor by turning the unit off waiting a few minutes and then turning the unit back on If that doesn t work you can reset the software CAUTION This procedure will cause most programmed entries and accu mulated data stored in the 4250 to be lost and the flow meter will revert to factory default settings If this operation is per formed it...

Page 154: ...high If the unit should fail to operate properly the problem is most likely a mechanical failure Items such as a broken or intermittent connections in the power cable or wiring harness or rarely poor electrical connection through keypad switches should be suspected 5 6 1 If Serious Problems Occur If you suspect an electronic problem Teledyne Isco recommends that you contact the Technical Service D...

Page 155: ...itions these should stay in good condi tion However physical stress or operation of the unit with the door open or the desiccator saturated could cause corro sion of the connectors in certain atmospheres 5 Look for physical damage Burnt broken or overly hot components stuck or inopera tive switches or water damage may be apparent if you look closely 6 Look for shorted or open diodes and transistor...

Page 156: ...ys roll up sleeves so that your arms are in contact with the working surface Avoid using a work surface made of an extremely good insulator Plastic and glass are good insulators and should be avoided A metal surface is best a wood surface is acceptable Conductive grounding mats are available for work stations and are worthwhile if much repair is to be done The degree of hazard depends on the level...

Page 157: ...use them They may already be destroyed Once assembled and soldered printed circuit boards are easily damaged by improper repair procedures Do not attempt to remove components particularly ICs from printed circuit boards unless skilled at this procedure After a defective component is replaced the unit still may not work if excessive heat or pressure has broken the foil traces or pulled the cores fr...

Page 158: ...reports stored in the instrument s memory Collect the data from the instru ment before proceeding 5 8 1 Updating the Flow Meter Software The flow meter should be powered and turned on Connect your computer to the flow meter using the Computer Connect Cable Interrogator Cable and start the program Update Isco Instrument Software Figure 5 10Open the software update program Click the Help button and ...

Page 159: ... Flow Meter replacement parts A list of accessories and optional equipment can be found at the end of this section Replacement parts can be purchased by contacting Teledyne Isco s Customer Service Department Teledyne Isco Inc Customer Service Department P O Box 82531 Lincoln NE 68501 USA Phone 800 228 4373 402 464 0231 FAX 402 465 3022 E mail IscoInfo teledyne com ...

Page 160: ...4250 Flow Meter Appendix A Replacement Parts and Accessories A 2 ...

Page 161: ...4250 Flow Meter Appendix A Replacement Parts and Accessories A 3 ...

Page 162: ...elocity 16 60 3234 022 Supply Spool Assembly 17 60 3234 023 Reroll Spool Assembly 18 60 1874 024 Desiccant Cartridge Assy 28 60 3213 098 Printer Mod 37 60 3213 229 Spool End Cap 39 60 3213 255 Wall Mount 40 60 3213 259 Window 41 60 9003 031 Connector Hole Plug 42 60 3233 099 Hinge Pin 43 60 3233 106 Desiccant Can Holder 44 60 3233 115 Connector Clip 688 Dia 45 60 3233 116 Connector Clip 813 Dia 46...

Page 163: ...el 135 77 142 2001 00 Component Holder 3 4 11 4 78 142 2003 00 Component Clip 3 4 79 149 1000 00 Amp Dust Cover 9760 10 80 149 1001 00 Amp Dust Cover MS9760 14 81 149 1001 01 Amp Dust Cover 9760 16 85 202 1000 14 O Ring 014 88 209 0166 65 Elbow Nylon 1 8 NPT to 1 4 ID 115 239 0416 32 Sheet Edge Fastener 6 32 116 231 0197 04 SST MS 10 32 1 4 PH Self Seal 118 60 1704 017 Strap Assy 119 099 0012 00 D...

Page 164: ...044 Interrogator Cable 25 pin 60 2544 040 Standard Y Cable for Isco Samplers 60 3704 081 Special Y Cable without diodes 60 5314 278 Reference Port Tubing 10 1 4 ID Vinyl provides an extension to the desiccant tube 60 2703 111 Reference Port Tubing 25 1 4 ID Vinyl 60 2703 112 Compression Bushing for non conduit wiring to Quick Disconnect Box 37 44 dia cable 209 0076 06 Chart Roller 60 3004 156 Prin...

Page 165: ...l 60 0603 218 YSI 600 to Isco 4200 6700 Adapter Cable 60 0604 001 YSI 600 and Isco 674 Rain Gauge Y Connect Cable 60 0604 002 This cable allows use of the YSI 600 Sonde and the Isco 674 Rain Gauge at the same time Use the following with Isco Mounting Rings in Round Pipe Installations Probe Carrier for Temperature probe 60 3204 010 Probe Carrier for pH probe with internal temperature sensor 60 3208...

Page 166: ...4250 Flow Meter Appendix A Replacement Parts and Accessories A 8 ...

Page 167: ...ear later An example is the alarm dial out feature This step requires your flow meter to have the optional modem If you do not have the modem no menus concerning dialout will appear If after filling out this chart you cannot make some menus appear that you need recheck your early steps to see that you have not accidentally locked yourself out of a path by an incorrect early selection If you only n...

Page 168: ...________ppm 19 YSI pH Enable Alarm Hysteresis ________pH units 20 YSI D O Enable Alarm Hysteresis ________ppm mg L 21 YSI Conductivity Enable Alarm Hysteresis_______mS cm 22 YSI Temperature Enable Alarm Hysteresis______Deg 23 Optional Outputs 4 20 Ma Output Serial Output Alarm Box Mechanical Totalizer 24 Report Setup Report A Flow D O pH YSI 600 Sample History Flow Meter History 25 Level In Report...

Page 169: ... Conductivity T D S ________Units________Coeff _______ 58 YSI Temperature Deg F Deg C Not Measured B 2 Flow Conversion Area Velocity 1 Flow Calculation Area Velocity 2 Area Velocity Calculation Velocity Data Points 3 Area Velocity Channel Shape Round Pipe U Channel Rectangular Trapezoidal_________________________ 4 Velocity Round Pipe Diameter __________Ft or meters 5 Velocity U Channel Width ____...

Page 170: ...90 120 5 End Contractions On Rectangular Weir Yes No 6 Rect Weir With End Contractions Enter Crest Length ___ _____ Feet or meters 7 Cipolletti Weir Enter Crest Length___ _____Feet or meters 8 Type Of Flume Palmer Bowlus Parshall Trapezoidal H HS HL Leopold Lagco 9 Palmer Bowlus Size 4 6 8 9 10 12 15 18 21 24 27 30 48 10 Parshall Size 1 2 3 6 9 1 0 1 5 2 0 3 4 5 6 8 10 12 11 Trapez Size LG 60 V 2 ...

Page 171: ...or meters 27 Select Data Set One Two Three Four None 28 Level Units For Data Point Entry Ft In M Mm 29 Flow Rate Units GPM GPS MGD CFS CFM M3 S M3 H M3 D LPS CFD GPH AFD CFH CFM M3 M 30 Set __ 1 4 0 Points Entered Add Point units 31 Set 1 Data Point 1 Enter __ ____ level units __ ____ units of volume Enter data points in the table below If you have multiple data point sets photocopy this table Dat...

Page 172: ...ly 12 YSI 600 Dissolved Oxygen Calibration D O Standard Absolute Barometric Pressure Altitude B 5 Reset Totalizer 1 Reset Totalizer Yes No 2 Enable Totalizer ______CF or other units _______ 3 Reset Sampler Enable Totalizer Yes No B 6 Sampler Pacing 1 Sampler Pacing Disable Volume Flowlink Conditional 2 Sampler Pacing Enter Pacing Volume __ ____ CF 3 Condition Level Flow Rate Rainfall D O pH Temper...

Page 173: ...ion Greater Than Less Than Rate Of Change 8 Select Operator Done Or And 9 Alarm Dial out Numbers Done Num 1 Num 2 Num 3 Num 4 Num 5 10 First Phone Number _______________________________ 11 Second Phone Number _____________________________ 12 Third Phone Number ______________________________ 13 Fourth Phone Number ______________________________ 14 Fifth Phone Number ________________________________...

Page 174: ... Generator B On Off Print 6 Report B Duration To Be In Hours Days Months 7 Enter Report B Duration ____Hours 8 Print Report B at Yr _____Month ___Day ___ Hr ___ Min ___ 9 Print Flow Meter History Yes No 10 Print Flow Meter History Print Since Last Print All NOTES Additional table for Data Point Entry Data Point Set 2 Level Flow Level Flow Level Flow Level Flow ...

Page 175: ...following procedures are those used by Black Veatch a respected consulting firm and are published here by permission Field personnel must keep safety uppermost in their minds at all times When working above ground rules of common sense and safety prevail However when entering manholes strict safety procedures must be observed Failure to do so could jeop ardize not only your own life but also the l...

Page 176: ... fumes cannot enter the manhole If testing equipment is not available the manhole should be assumed to contain an unsafe atmosphere and forced ventilation must be provided It should never be assumed that a manhole is safe just because there is no odor or the manhole has been entered previously 4 Entering Manholes Since the top of the manhole is usually flush with the surrounding surface there may ...

Page 177: ...of a pick ax screwdriver or small pry bar may result in injury A suitable tool can be made from 3 4 inch round or hex stock Two inches of one end should be bent at a right angle and the other end should be formed into a D handle wide enough to accommodate both hands Even with this tool care must be exercised to prevent the cover from being dropped on the toes The 2 inch projection should be insert...

Page 178: ...in print that do not reflect true conditions One of the most common errors is the assumption that people have died from a lack of oxygen The human body is able to function very well with substantially reduced oxygen concentra tions No one worries about going to Santa Fe New Mexico elev 2 100 meters where the partial pressure of oxygen is equal to 16 2 a normal atmosphere is about 21 oxygen When fi...

Page 179: ...s elsewhere in the world The presence of H2S in a sewer atmosphere is easily deter mined A bellows and ampoule type of tester is very satisfactory for the purpose even though it is only crudely quantitative When using a tester of this type do not bring the air to the ampoule by way of a tube as this may change the H2S concen tration Hang the ampoule in the air to be tested with a suction tube to t...

Page 180: ...n Exposure ppm Max Safe 8 Hour Exposure ppm Explosive Range by vol in air Limits lower upper Likely Location of Highest Concentration Most Common Sources Simplest and Cheapest Safe Method of Testing Ammonia NH3 Irritant and poisonous Col orless with characteris tic odor 0 60 Causes throat and eye irritation at 0 05 cough ing at 0 17 Short exposure at 0 5 to 1 fatal 300 to 500 85 16 25 Near top Con...

Page 181: ...eable at 0 03 Flamma ble 3 0 to 4 0 Anesthetic effects when inhaled Rap idly fatal at 2 4 Danger ous for short exposure at 1 1 to 2 2 4 000 to 7 000 1 000 1 3 6 0 At bottom Service stations garages storage tanks houses 1 Combusti ble gas indi cator 2 Oxygen deficiency indicator Hydrogen H2 Simple asphyxi ant Colorless odorless taste less Flammable 0 07 Acts mechani cally to deprive tissues of oxy ...

Page 182: ... NO2 Colorless Colorless sweet odor Reddish brown Irritating odor Deadly poison 1 04 1 53 1 58 60 to 150 ppm cause irritation and coughing Asphyxiant 100 ppm dan gerous 200 ppm fatal 50 10 Near bottom Industrial wastes Common air pollut ant NO2 detector tube Oxygen O2 Colorless odor less tasteless Supports com bustion 1 11 Normal air con tains 20 8 of O2 Man can tol erate down to 12 Minimum safe 8...

Page 183: ...rritation of the kidneys 100 At bottom Solvent used in paint 1 Detectable odor at low concentration s 2 Combustible gas indica tor Xylene C8H10 Colorless flam mable 3 66 Narcotic in high concentrations less toxic than benzene 100 1 1 7 0 At bottom Solvent Combustible gas indicator Percentages shown represent volume of gas in air For concentration over 0 3 Mostly methane and carbon dioxide with sma...

Page 184: ...4250 Flow Meter Appendix C General Safety Procedures C 10 ...

Page 185: ...is appendix provides Material Safety Data Sheets for the des iccant used by the 4250 Flow Meter Teledyne Isco cannot guarantee the accuracy of the data Specific questions regarding the use and handling of the products should be directed to the manufacturer listed on the MSDS ...

Page 186: ... excess of water to cool the silica gel Ingestion Material is not toxic and will pass through the body normally Inhalation Slight irritation is possible but none is expected Medical Effects Generally Aggravated by Exposure Respiratory ailments Chronic Effects Carcinogenicity May cause eye skin and mucous membrane irritation and drying Section 3 Composition Information on Ingredients Component Name...

Page 187: ...tive to statistic discharge Not sensitive to mechanical impact Section 6 Accidental Release Measures Spill Sweep or vacuum up and place the spilled material in a waste disposal container Avoid raising dust Wash with soap and water after handling Section 7 Handling and Storage Handling Avoid raising dust and minimize the contact between worker and the material Practice good hygienic work practices ...

Page 188: ...water Vapor Pressure Not applicable Specific Gravity 2 1 Evaporation Rate Not applicable Odor Threshold Not applicable Coefficient of water oil distribution Flammable Flash Point Not applicable Not applicable Not applicable Auto ignition Point Flammable Limits Not applicable Not applicable Section 10 Stability and Reactivity Stability Stable Conditions to avoid Moisture and high humidity environme...

Page 189: ...ontact the product during normal use may be retained on the product The user of the product must identify the hazards associated with the retained material in order to assess the waste disposal options Dispose according to federal state and local regulations Section 14 Transportation Information U S Department of Transportation Shipping Name Not classified as a hazardous material Not regulated Tra...

Page 190: ...s data sheet concerning the use of our product and the materials contained therein are believed to be correct but does not purport to be all inclusive and shall be used only as a guide However the customer should determine the suitability of such materials for his purpose before adopting them on a commercial scale Since the use of our products is beyond our control no guarantee expressed or implie...

Page 191: ...4250 Flow Meter Appendix D Material Safety Data Sheets D 7 ...

Page 192: ...4250 Flow Meter Appendix D Material Safety Data Sheets D 8 ...

Page 193: ...onversion Types 2 5 Flowlink Software 4 12 H High Low Alarm Box 2 24 4 12 I Indicators 1 8 Installation AV Sensor 3 12 Desiccant Canister 3 1 Desiccant Cartridge 3 1 Flow Meter 3 7 Maximum Distance 3 9 Parameter Probes 4 13 K Keypad Functions 2 2 L Language 2 27 Level Measurement Open Channel 3 13 Low Power 3 3 M Maintenance Cable Inspection 5 7 Case 5 1 Desiccators 5 2 Moisture Damage 5 1 Printer...

Page 194: ... Parameter to Adjust 2 43 Step 4 Reset Totalizer 2 49 Step 5 Sampler Pacing 2 49 Step 6 Sampler Enable 2 52 Step 7 Alarm Dialout 2 55 Step 8 Printer 2 57 Step 9 Reports History 2 59 Programming Worksheets B 1 R Rain Gauge 4 11 Replacement Parts A 1 Reports 2 24 Ribbon Replacement 5 10 S Safety Information C 1 Scissors Ring 3 18 Serial Output 2 22 4 4 ASCII Codes 2 22 Service and Troubleshooting CM...

Page 195: ...tration of the hazardous substance in this component s any homogeneous pieces is lower than the ST standard limitation X 嫷䯉年㦘㹡㦘 䓸德咂 年捷ↅ䤓㩟 德㧟㠨 䤓 摞怔 ST 㪖 屓 䤓棟摞尐㻑ᇭ 㷳 㫈㗽 棔 ₙ嫷 㓢 X 䤓㔏㦾 扪嫛扪 㷴広㢝ᇭ X Represent the concentration of the hazardous substance in this component s at least one homogeneous piece is higher than the ST standard limitation Manufacturer may give technical reasons to the X marks 䘾 䞷㦮䟀兞洛...

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Page 197: ...ny homogeneous pieces is lower than the ST standard limitation X 嫷䯉年㦘㹡㦘 䓸德咂 年捷ↅ䤓㩟 德㧟㠨 䤓 摞怔 ST 㪖 屓 䤓棟摞尐㻑ᇭ 㷳 㫈㗽 棔 ₙ嫷 㓢 X 䤓㔏㦾 扪嫛扪 㷴広㢝ᇭ X Represent the concentration of the hazardous substance in this component s at least one homogeneous piece is higher than the ST standard limitation Manufacturer may give technical reasons to the X marks 䘾 䞷㦮䟀兞洛䫽 ᇭ The Environmentally Friendly Use Period EFUP was det...

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Page 199: ...operated in a commercial environment This equip ment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which the user will be required to correct the interference at his own ex...

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Page 201: ... 61010 1 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use Standard Description Severity Applied Performance Criteria IEC 801 2 Electrostatic Discharge Level 2 4kV contact discharge Level 3 8kV air discharge B B IEC 801 3 Radiated RF Immunity 27 MHz to 500MHz Level 2 3 V m A IEC 801 4 Electrical Fast Transient Level 2 1kV on ac lines B CISPR11 EN 55011 RF Emis...

Page 202: ...Warranty ...

Page 203: ...the instrument proves to be defective within 30 days of shipment Throughout the remainder of the warranty period the customer will pay to return the instrument to Teledyne Isco and Teledyne Isco will pay surface transportation to return the repaired instrument to the customer Teledyne Isco will not pay air freight or customer s packing and crating charges This warranty does not cover loss damage o...

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