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Optical Scientific Inc

 

 

OFS 2000FW User’s Guide 

 

P/N 1910-901-1 

 

Rev. 03/28/13 

 

47 

8.2.2 Display and Keypad  

 
The Control Box features a digital display module and 4-position keypad that may be used to enter all user 
parameters. To access the Menu press and hold the SET key for at least 3 seconds. This will bring up the first 
Menu item which is “Units of Measure”. The following keys are used: 
 
The NEXT (

) key is used to accept the selection and move to the next available parameter. 

The SET (

) key is used to accept the selection and exit to operational mode. 

The Press the UP (

) or DOWN (

) keys to move up and down to the available choices of a given 

parameter such as 9600 baud, 14,400 baud, etc. 
 
The tables describe each user - selectable parameter, available choices, and how to use the keypad to 
navigate within the parameter. 
 

Units of Measure 

Press 

 or 

keys to select a new unit of measure. Press NEXT to select and 

advance to the next parameter or SET to select and exit set-up function. 

Meters per Second 

Default 

Km per Hour 

 

Miles per Hour 

 

Feet per Second 

 

Feet per minute 

 

 

Averaging Time 

Press 

 or

keys to select a new averaging time. Press NEXT to select and 

advance to the next parameter or SET to select and exit set-up function. 

3 Seconds 

Not recommended for operation. Setup, testing and diagnostics only. 

10 Seconds 

 

30 Seconds 

 

60 Seconds 

Default 

2 Minutes 

 

5 Minutes 

 

10 Minutes 

 

NOTE:

 While setting up the meter for the first time or doing trouble shooting, the averaging time should be set to 

a short time duration (10 seconds or 3 seconds) for rapid response to any parameter changes. The averaging 
time is equivalent to a radio circuit time constant. For any step change in the input, it will take approximately 3 to 5 
time constants to reach a 90% Full Scale response. Once the meter is properly set up you can change the 
Averaging time to a longer setting such as 60 seconds, to smooth out the data. Regardless of the averaging time, 
the display refreshes every 3 seconds.  
 

Baud Rate 

 

RS-232 output only

 

Press 

 or

keys to select a new baud rate. Press NEXT to select and advance 

to the next parameter or SET to select and exit set-up function. 

300 Baud 

 

1200 Baud 

 

2400 Baud 

 

4800 Baud 

 

9600 Baud 

Default 

14,400 Baud 

 

19,200 Baud 

 

28,800 Baud 

 

 
 

 

Содержание OFS-2000F

Страница 1: ...2000FW User s Guide P N 1910 901 1 User s Guide OFS 2000FW Optical Flow Sensor 03 28 13 OPTICAL SCIENTIFIC INC Tel 1 301 963 3630 Fax 1 301 948 4674 2 Metropolitan Ct Suite 6 Gaithersburg MD 20878 USA...

Страница 2: ...6 Release Model 2000W with Automatic Transmitter Power Feedback Control 5 11 07 Add Installation Procedure Summary in Appendix B 7 1 07 Change new address 08 04 10 Update OFS 2000W Wiring Diagram in A...

Страница 3: ...essurization Unit Set Up 22 3 6 3 Pressurization Unit Operation 23 3 7 AC Power Connections 24 3 7 1 Transmitter Unit 24 3 7 2 Control Boxes 24 3 8 User Interface Connections 25 3 9 OFS 2000FW Interco...

Страница 4: ...eiver Signal Led Not Lit 57 10 2 6 Signal Voltage Checks Receiver 58 10 2 7 Signal Voltage Checks Receiver Control Unit 58 10 3 Control Box Troubleshooting 59 10 4 Error Messages 59 10 4 1 Channel A B...

Страница 5: ...pressed Air Purge 17 Figure 3 11 Purge Air at 90 to Vertical Flow 18 Figure 3 12 Rotameter Installation 18 Figure 3 13 Typical Gate Valve Installation 19 Figure 3 14 Z Purge Control Unit 20 Figure 3 1...

Страница 6: ...LEDs 44 Figure 8 4 Correction Factor Display 50 Figure 9 1 Window Cleaning 54 Figure 10 1 DSP Power Indicators 57 Figure 10 2 DSP Main Com 57 Figure 12 1 Typical Thermal Activator Setup 61 Figure 12...

Страница 7: ...voltages Disconnect AC power before servicing Optical Scientific Inc will not be held liable for any accident injury to personnel or damage to property incurred while operating or servicing this equip...

Страница 8: ...ts The LED in the transmitter emits a light beam which illuminates twin photodetectors in the receiver The received signal is amplified and sent to the Digital Signal Processor DSP in the Control Unit...

Страница 9: ...orrect operation Operational Environment Outdoor components TX RX Heads NEMA 4 4X Control Box Ambient Temperature 40 to 60 C Dust Intrusion IP65 Moisture 0 100 condensing Data Output Dual 4 20 ma opti...

Страница 10: ...h integral spool piece flange adapters These adapters provide isolation and are equipped with purge air fittings to keep the light path clear There are two types of Control Box Outdoor and Rack Mount...

Страница 11: ...clean The transmitter housing contains the transmitter optical assembly and transmitter driver circuit board The optical assembly is pre aligned in the factory and needs no focusing just aiming The L...

Страница 12: ...Gaskets are supplied for installing the Receiver and flange adapter on the customer s flange A silicone gasket is provided between the housing and the flange adapter to provide a weather tight seal A...

Страница 13: ...front panel for setup and display of real time information B Power Supply The OFS contains a universal input DC power supply that operates with input voltages from 100 to 240 VAC 50 60 Hz This allows...

Страница 14: ...nts This data is transmitted to the microcontroller to be integrated into the information data stream D Interface Board Central point for all of the OFS interconnections A 12 pin terminal Block TB2 to...

Страница 15: ...diameter leading upstream of the OFS and one times the pipe diameter trailing are good enough for OFS to make a representative flow measurement In some cases OFS units have been installed right at the...

Страница 16: ...to measure and know the path length for an OFS meter which is required for example when mounting an opacity meter Therefore in this regard mounting an OFS is simpler Alignment need not be micrometric...

Страница 17: ...the light beam off center The transmitted light beam will still reach the receiver and the system will work However the received signal will be weaker and performance will be compromised Note OFS use...

Страница 18: ...re the flow is dampened somewhat by the stack interior surface Since this falls outside the RATA test area pipe protrusion should not pose a problem For example Figure 2 3 Measured Flow Cross Section...

Страница 19: ...ge Air Figure 2 4 Flange Installation Incorrect Figure 2 5 Flange Installation Correct OFS 2000 is designed to mount to the 4 inch ANSI 150 pipe flanges commonly used in industry The standard dimensio...

Страница 20: ...r junction box 3 2 Required at Control Unit Location Instrument grade air See notes in Sections 3 4 Purge Air and 3 6 Z Purge Air Single phase 100 240 VAC 1 A power with appropriately rated and approv...

Страница 21: ...ches for the TX RX head with Flange Adapter is shown in Figure 3 4 Figure 3 1 Common Vertical Installation Figure 3 2 Common Horizontal Installation Figure 3 3 OFS Mounting Hardware ITEM QTY DESCRIPTI...

Страница 22: ...Optical Scientific Inc OFS 2000FW User s Guide P N 1910 901 1 Rev 03 28 13 15 Figure 3 4 OFS TX RX Overall Dimensions Units inches...

Страница 23: ...of the RX Unit if the standard P N 1910 217 cable was ordered The maximum length of the RX cable is 300 feet Figure 3 5 shows the Control Box mounting dimensions 3 3 2 2 Control Box Indoor Figure 3 6...

Страница 24: ...from misapplication and or lack of control it s use is not encouraged The use of Active Purge as described herein is recommended for optimum results Active Purge It is recommended the user apply inst...

Страница 25: ...common sense is encouraged The user should monitor window conditions and adjust purge air incrementally if needed until a balance is reached between affecting the system velocity readings and need for...

Страница 26: ...are available Consult OSI Engineering Department A typical installation is shown below Figure 3 13 Typical Gate Valve Installation Install a gate valve or similar shutoff device between the flange ad...

Страница 27: ...and practices OSI offers an equipment package which meets established North American requirements and has been found to work satisfactorily This package and recommended configuration is designed to p...

Страница 28: ...r TX and RX units and one for the control box Figure 3 16 Typical Z Purge Control Unit When the Z Purge option is ordered the OFS is shipped with vents and air fittings installed as shown in the figur...

Страница 29: ...or is closed and Protective Gas Supply is ON 2 Adjust Redundant Regulator if utilized to 5 psi maximum or skip to step 3 if enclosure is equipped with a Model PV 3 Purge Vent 3 Test Purge Vent if util...

Страница 30: ...rization Unit Operation 1 Ensure Protected Enclosure Power is OFF Enclosure Pressure Control Regulator is closed Protective Gas Supply is ON and alarm system is activated if utilized 2 If utilized tes...

Страница 31: ...from the user supplied AC power cord should be connected to the earth ground stud in the TX Unit The OFS is supplied with an internal green yellow ground wire from this stud to the ground terminal on...

Страница 32: ...are at terminal block TB3 pins 1 and 2 Other pins are provided for Second current loop OFS 2000 F FW P V Fault Indicator Relay Calibration Indicator Relay Remote switch for Cal Initialization The RS...

Страница 33: ...interface board The AGC Cable 1910 810 carries a signal voltage to the Automatic Gain Control AGC circuitry on the transmitter driver board It connects directly to the circuit boards in both units as...

Страница 34: ...e ex 1910 217 XXX where 1910 217 BASIC ASSEMBLY NUMBER XXX CABLE LENGTH IN FEET Customers may opt to make their own cables If this is the case the following information is provided Cables should be 10...

Страница 35: ...inals The maximum loop resistance is 600 ohms This includes the cable resistance and the load resistor in the customer data acquisition system Loop 1 is standard on all models Pins 3 and 4 are for a s...

Страница 36: ...Box must be installed more than 100 feet from the user s computer The LDM converts the RS 232 levels to current loops for noise free long distance transmission Using 24 AWG wire the LDM will transmit...

Страница 37: ...or is plugged in J2 on the Control Box and one at the remote computer Since OFS is configured as a DCE device and the user s computer is configured as DTE the FOM at the OFS side should be configured...

Страница 38: ...for trouble shooting purposes since it includes diagnostic and calibration information The computer outputs a delimited text file that can be imported into a spreadsheet and plotted or analyzed An ad...

Страница 39: ...case is used throughout See following tables for details of poll responses 4 1 A Poll Short Data String Output 4 1 1 A Poll Response Bytes Byte Description Field Symbol Description 1 Flow Direction r...

Страница 40: ...scribed in section below 33 Comma delimiter 34 Low Cal Point L Fixed Field Low Calibration Point 35 Comma delimiter 36 or indicates calibration value is greater than reference indicates calibration va...

Страница 41: ...0 10 1 kph 1 30 2 mph 2 60 3 fps 3 120 4 fpm 4 300 5 600 6 3 Byte Operation Mode Description Byte Full Scale Range Description 31 0 Normal Operation 32 0 0 40 m s 1 A B out of range 1 0 20 m s 2 Velo...

Страница 42: ...ds and Bytes What this shows Flow 8 27 Meters per second Outward Carrier A signal 7 40 Volts DC Carrier B signal 7 79 Volts DC System status Units of Measure m s Averaging Time 60 sec Operation Mode N...

Страница 43: ...M1 Set 9600 8 0 1 Choose File Properties Choose ASCII Setup Choose Append Line feeds Figure 5 2 HyperTerminal setup steps Figure 5 1 Connect PC to Controller The most effective tool in determining how...

Страница 44: ...r the purpose of the data collection in this case is for problem analysis Often proper analysis will require several hours of data over and above the minimum hours worth so plan accordingly 5 2 Using...

Страница 45: ...flow will suffice The A photo detector should be the first to see the flow stream with the B following Figure 6 2 Receiver LEDs and Flow Direction Loosen the locking screw on the right side of the mou...

Страница 46: ...though care is taken in the initial installation of the mounting flanges the beam may not be properly centered Figure 6 5 Centering Light Beam Figure 6 6 TX Rear View Note You will have to peer throug...

Страница 47: ...ed the A B voltages should be within 30 of each other although If they are not within 30 re do the aim until they are By convention the A detector is the one that first sees the turbulence and is ther...

Страница 48: ...tector board and have some confidence that it is properly centered Do this exercise with both the Up Down and Side to Side adjustment knobs Figure 6 8 Transmitter Module Figure 6 9 Beam Centering In F...

Страница 49: ...T cause any harm to any components but will cause the A B voltage readings to max out and make it difficult to determine when the light beam is truly centered on the receiver module A temporary remedy...

Страница 50: ...erprint match is good enough that we can be confident it was made by the same set of eddies and the velocity output will be within specifications Various factors may affect the shape match of the scin...

Страница 51: ...n signal LED is OFF The transmitter LED is off or not modulated properly Receiver Red power LED is ON The system is powered 8VDC from Control Box Red power LED is OFF The system is not powered Green s...

Страница 52: ...t front panel see that the display steps through initialization and reports voltage levels correlation and flow Set the flow rate unit of measure to the type preferred by the customer Set the time con...

Страница 53: ...on typically in the range of 30 to 999 The 4 bytes of data beginning with A are the received signal strength of optical channel A 0 1 to 9 99 volts The 4 bytes of data beginning with B are the receive...

Страница 54: ...Miles per Hour Feet per Second Feet per minute Averaging Time Press or keys to select a new averaging time Press NEXT to select and advance to the next parameter or SET to select and exit set up func...

Страница 55: ...o select and exit set up function Show Curve Fitting Value Curve fitting can only be inputted via a laptop computer Press key to show current OFS and Ref values up to 6 points If there is no curve fit...

Страница 56: ...n m s equivalent velocity in that unit shows on the menu automatically The Current Loop can be set to 0 20mA and be set to default to 0 or 4mA on fault condition These menu items are accessed by press...

Страница 57: ...e NEXT key to step thru the menu selections until you come to Correction Factor Press the UP or DOWN keys to select percentage in 1 increments Press the SET key to save and exit the setup menu From an...

Страница 58: ...bration check cycle the OFS injects precise phase shifted frequency pairs that represent by default 10 of the full range Zero Calibration 30 of the full range Mid Calibration and 60 of the full range...

Страница 59: ...to on site real time flow measurements at the same location while the system is installed and in actual operation These calibration tests are known in the United States as RATA Relative Accuracy Test...

Страница 60: ...n you have to diagnose a problem which has appeared and you want to compare with the way it used to look Biannually or when cleaning windows Installation condition check Inspect the TX Head RX Head an...

Страница 61: ...he remaining top bolt so that the window is exposed Use commonly available glass cleaner or alcohol to flood the glass windows Be careful they may be HOT Use a soft cloth to wipe away any dirt accumul...

Страница 62: ...umber of 100 or over is considered good For more details about correlation See Section 7 Correlation A low temperature slow moving air mass will have little thermal turbulence low correlation A hot ra...

Страница 63: ...d the LED module Carefully look from far down the interior of the pipe near the stack wall location right up to the window It sometimes takes some patience and time for your eye to adjust and to get t...

Страница 64: ...there is AC voltage present replace the transmitter board If there is no AC voltage present check the AC supply line for fault 10 2 3 Transmitter Signal Led Not Lit Be sure the transmitter module wiri...

Страница 65: ...re NOT a valid determination of system performance They are simple tests to verify system function and assist field personnel in tracing problems Refer to Section 3 10 for cabling diagram The Outdoor...

Страница 66: ...ace Control Module 1910 309 Velocity data near zero with A B between 1 and 8 volts and correlation R 30 Verify that orientation arrows on RX Optical Assembly are pointing in direction of known flow Re...

Страница 67: ...ue gas 5 Window Retaining Ring w Gaskets Screws p n 1910 808 Specify 3 hole aluminum older units or 6 hole stainless steel newer current units version 6 Digital Signal Processor DSP PCB p n 1910 312 7...

Страница 68: ...g heat to increase the amount of thermal turbulence present has been found to work very well To that end OSI offers the Thermal Activator option The Thermal Activator Option is simply a bar heater ins...

Страница 69: ...nsions Operational Environment Ambient Temperature 40 to 60 C Power Requirements 120 VAC 50 60 Hz 7A or 240VAC 50 60 Hz 3 5A depending on user line power Physical Characteristics Weight 4 lb 12 oz Dim...

Страница 70: ...e at bottom of page Figure 12 3 Heater Wiring Figure 12 4 Heater Schematic Note The use of the thermocouple for temperature control purposes and or monitoring is at the discretion of the user and outs...

Страница 71: ...e low the fact that there are multiple sources of different media densities ensures that there is sufficient thermal and or density turbulence present to sense and measure the flow velocity Figure 12...

Страница 72: ...breaker be provided The heater element is 3 4 in diameter 36 long with an INCONEL sheath and threaded to fit a 3 4 NPT port The active portion of the heating element begins 12 from the base and extend...

Страница 73: ...beam axis A certain amount of shifting may be allowed for as not all sites are ideal but the more critical parameter is the 8 centerline distance between the heater and the light path This should be...

Страница 74: ...ver and 8 inches upstream of the light path The heater should have a dedicated AC line of suitable gauge based on wattage and distance controlled by a circuit breaker The heater head has connection hu...

Страница 75: ...which in it s progress provides the base information to fix the curve fitting points During the RATA the customer facility is operated at Low Medium and High load capacity while the independently cont...

Страница 76: ...n the User Guide This will prevent the system from interrupting the procedure with a calibration check 5 Remove any Correction Factor that may have been entered Set to 1 See Section 8 2 4 Correction F...

Страница 77: ...Units of Measure UOM you wish to use In this example we enter 3 for Feet per Second Once the UOM has been chosen you will be prompted to enter the three data sets in ascending order 1 Low 2 Medium and...

Страница 78: ...will be the second curve fitting point Medium and last will be the third curve fitting point High Another press of the Next key will return you to Setup level At this point the curve fitting procedure...

Страница 79: ...olidays Telephone assistance for overseas customers is available by appointment E mail at least 1 business day in advance 16 1 Before Calling Technical Support Please have or be able to provide Unit o...

Страница 80: ...Optical Scientific Inc Appendix B OFS 2000F FW User s Guide P N 1910 901 1 Rev 03 28 13 73 This page intentionally left blank...

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