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APPENDIX D:  TROUBLESHOOTING

TD1000C™Oil in Water Monitor 

28

TD-1000C Oil In Water Monitor 

Operation Manual 

PN 101687 

REV G

Sample Block

Houses flow cell and optical filters.  The sample block must be replaced to change the flow cell or filters.

Power Terminal 

Strip

Located behind enclosure front panel.  Power, AC relay, DC outputs, flow switch, and 4–20 mA chart recorder 

connections are made on this strip (see 

Figure 7

).  Only trained personnel should make electrical connec-

tions.

APPENDIX D:  TROUBLESHOOTING

A Quick Reference Guide is installed on the left hand face of the TD1000C™.  This guide details all 
necessary parameter access details for both calibration and diagnostic needs.

The TD1000C™ utilizes aspects of optics, chemistry, and electronics in its operation; therefore it is 

important to collect all diagnostic data first.  A troubleshooting worksheet is provided in this appendix to 

facilitate data collection.  After collecting all data on the worksheet, most problems can be solved over 
the phone.  Refer to 

Section D.2

 for the appropriate telephone numbers.

This guide assumes that all problems associated with an alarm have been resolved prior to beginning 
troubleshooting.  Something as simple as a clogged inlet line can lead to other alarm messages, which 
could all be solved at one time simply by clearing the obstruction.  The absence of a System Function 
Alarm (

F-A

) is persuasive evidence that the electronics of the instrument are functioning properly. In that 

case, it is likely that the problem is mechanical, has resulted from another system problem, or from the 
operator’s unfamiliarity with the monitor.

After handling all alarms (see 

Appendix E)

, the troubleshooting procedure works best in this sequence:

1. 

Determine whether or not System Values have been entered correctly (see the Configuration 

Record in 

Appendix B

 and the System Default Values in 

Table 4

.

2.  Perform Diagnostics procedure as described on the following page.

3.  Determine whether or not the process water is behaving as expected.  Does the blank read 

close to zero on the 

HOME

 screen and calibration solution read between 5 and 10 on the FS% 

diagnostic screen?  Check the 

CAL DATA

 screen (see 

Appendix D

) to determine whether the 

last calibration seems correct.

4.  Complete the Troubleshooting Worksheet.

5.  Contact your Turner Designs Hydrocarbon Instruments representative or Turner Designs 

Hydrocarbon Instruments at +1 559 253 1414 (see Section D.2).

D.1  Diagnostics

The TD1000C™ contains diagnostic screens and functions to aid in troubleshooting.  
These functions are accessed from the HOME screen by pressing <

Ý

>, then <ENT> 

to page through the series of 9 screens.  Press the LEFT ARROW

 <

ï

>

 to return to 

a previous screen, or <ESC> or <HOME> to return to the HOME screen.

1.  From the HOME screen, press <

Ý

>:

TD1000C™

SW: V2 0606

Содержание TD1000C

Страница 1: ...TD1000C OIL IN WATER MONITOR PN 101687 REV G ...

Страница 2: ......

Страница 3: ...al Connections 8 3 6 Electrical Connections 8 4 START UP 9 4 1 Start Up Procedure 10 5 CALIBRATION 14 5 1 Cell Condition Calibration Procedure 14 5 2 Fluorescence Calibration Procedure 16 5 3 Notes on Calibrating 18 5 4 Calibration Data Screen 20 5 5 Fluorescence Calibration Screens 20 5 6 Cell Calibration Screens 21 6 PREVENTIVE MAINTENANCE 22 6 1 Re Calibration 22 6 2 Cleaning the Flow Cell 22 6...

Страница 4: ... E ALARMS 35 E 1 Alarm Delay 36 E 2 Alarm Activation 36 E 3 Multiple Alarms 36 E 4 Alarm History 36 E 5 Notes About Alarms 36 E 6 System Function Alarms Definitions 36 E 7 Measurement Function Alarm Definitions 37 APPENDIX F SYSTEM VALUE PARAMETERS 38 APPENDIX G SOFTWARE KEYPAD FUNCTIONS 42 G 1 Screens 42 G 2 Keypad Functions 42 G 3 User Identification 44 G 4 Fluorescence Display 44 G 5 LCD Contra...

Страница 5: ...ctivate control devices to stop divert or dilute process streams This microprocessor based fluorometer consists of optical components an on off controller with electrical inputs outputs for a flow switch a 4 20 mA output signal two 5 VDC alarm outputs and one 120 240 VAC alarm output The TD1000C is engineered to ensure reliability and pre assembled to simplify installation plumbing and calibration...

Страница 6: ...ax 1 559 253 1090 www oilinwatermonitors com 2 SPECIFICATIONS This section lists physical electrical and operating specifications for the TD 1000C monitor Physical Specifications Dimensions 13 75 in 349 3 mm W x 6 11 16 in 170 mm D x 12 75 in 323 9 mm H Weight 13 lbs 5 86 kg 10 lbs 4 54 kg PVC Enclosure Approximates NEMA 4X Inlet Outlet Pipe Size 0 25 in 6 35 mm Female National Pipe Thread FNPT El...

Страница 7: ...gns Hydrocarbon Instruments recommends that stainless steel flexible tubing is used on the inlet and outlet connections to facilitate future maintenance needs 3 3 MONITOR LOCATION The monitor should be installed in an area that allows efficient sampling yet does not exceed any operating parameters The following cautions are provided to prevent monitor damage The monitor should not be installed Adj...

Страница 8: ...igures 1 through 5 for the location of the required mechanical connections Sample inlet 0 25 in 6 35 mm FNPT Sample outlet 0 25 in 6 35 mm FNPT Optional vent connection 0 25 in 6 35 mm compression tube fitting The outlet plumbing connections must not place stress on the 0 25 in 6 35 mm tube drain connection point Damage to the instrument may occur if plumbed incorrectly Pipe rises greater than 10 ...

Страница 9: ...aker 2 Loosen the termination screw and pull the wire out of the terminal When finished carefully insert the ribbon cable onto the PCB and replace enclosure face with the 6 screws Signal wires and power wiring should not be run in the same conduit Failure to separate or shield these wires will result in electrical interference Improper installation use application or unauthorized servicing of this...

Страница 10: ...r The HOME screen will display the RFU value instruments with software 103271 REV B and newer will display PPM as the default unit the process water temperature and the Cell Condition x x RFU T xxC CELL xxx Sample Home Screen Monitors with newer firmware will read PPM instead of RFU If the screen is blank or dark try adjusting the screen contrast using the UP ñ and DOWN ò arrows STEP 3 During star...

Страница 11: ...lue Press ENT Press HOME 1 Offset Value Press 1 Press ENT Key in the desired numerical value Press Ý to select a positive or negative offset Press ENT Press HOME 2 High Signal Alarm Level Press 2 Press ENT Key in High Signal Alarm Level Press ENT Press HOME 3 4 mA Output Press 3 Press ENT Key in 4 mA Output Press ENT Press HOME 4 20 mA Output Press 4 Press ENT Key in 20 mA Output Press ENT Press H...

Страница 12: ...e value is displayed Press HOME 9 Fluorescence temperature compensation Press 9 Press ENT Key in new Temperature Compensation value Press ENT Press HOME Record all system values in the configuration record located in Appendix B STEP 4 During start up the date and time values must be set to local standards The TD1000C ships with time and date set to Pacific Standard Time The date and time values ar...

Страница 13: ...ck menu 4 Day Press from HOME Press 4 Key in the day 1 31 Press ENT Press ESC to return to clock menu 5 Year Press from HOME Press 5 Key in year 00 99 Press ENT Press ESC to return to clock menu After start up wait a minimum of 15 minutes before Cell Condition Calibration to allow the monitor to come to equilibrium STEP 5 Perform a site specific Cell Condition calibration See Section 5 1 for the s...

Страница 14: ...n the drain position with the end of the valve handle pointed up See Appendix K STEP 2 Clean the monitor by injecting cleaning solution with a syringe into the flow cell The syringe screws onto the Luer lock fitting on the inlet of the flow cell see Figure 1 Fill syringe with 60 mL of cleaning solution Screw syringe onto fitting Inject cleaning solution at a slow steady rate into flow cell and all...

Страница 15: ...EP 7 Press ENT PROCESS WATER STEP 8 Press Ý CELL CALIBRATION x xxxV wait WAIT Process water will be flowing through the instrument during the Cell Condition Calibration Any value above 0 50 V is acceptable When the reading is stable press Ý The monitor will display a flashing wait WAIT message in the lower right hand corner of the screen while the monitor registers the cell condition value STEP 9 ...

Страница 16: ...ve to the drain position The valve is correctly positioned when the green valve handle is oriented horizontally If your instrument has PVC wetted parts position the inlet valve handle horizontally and the outlet valve in the drain position with the end of the valve handle pointed up See Appendix K STEP 2 Clean the monitor by injecting cleaning solution with a syringe into the flow cell The syringe...

Страница 17: ...rce bubbles out by pushing a small amount of solution through the needle end of the syringe STEP 7 Press ENT BLANK xx x Any value less than 25 is acceptable If blank is greater than 25 and Ý is pressed an error message will be received Press ESC to abort calibration and check the blank solution Press Ý when the reading is stable The monitor will display a flashing WAIT wait message in the lower ri...

Страница 18: ...en the flow cell inlet valve The valve is open when the yellow valve handle is oriented vertically Shift the flow cell outlet valve to the process flow position The outlet valve is correctly positioned when the green handle is vertical If your instrument has PVC wetted parts position the inlet valve handle vertically and the outlet valve in the process position with the end of the valve handle poi...

Страница 19: ...nts may result in inaccurate fluorescence measurements 9 All solutions are injected with a syringe into the stainless steel Luer lock Injection Port Depress plunger at a steady slow rate 10 Use separate syringes for blank calibration and cleaning solutions Avoid excessive twisting of the syringe onto the Luer lock Injection Port 11 Avoid injecting bubbles into the monitor Bubbles trapped when inje...

Страница 20: ...T 2 0 0 0 250 Cal Std ENT 2 500 0 0 1000 5 5 FLUORESCENCE CALIBRATION SCREENS HOME XXXX RFU T 23C Cell 100 1 From the HOME Screen press ENT ENT 1 Calib 2 Data Cal XX Days Ago 2 Press 2 to view raw data output for blank and cal standard as set during current calibration OR to begin calibration sequence 2 Blank XX X Cal Std XXX X 1 Please Input ID 3 If requested key in ID and press ENT If not reques...

Страница 21: ...e to start sample flow by returning valve handle to the vertical position Calibration is finished 5 6 CELL CALIBRATION SCREENS HOME XXXX RFU T 23C Cell 100 1 From the HOME Screen press CELL CALIBRATION ENT TO START 2 Press ENT to initiate the cell calibration sequence ENT FLOW CELL CLEAN ENT TO CONT 3 Press ENT if the flow cell is clean Press HOME and clean flow cell if flow cell if necessary Rest...

Страница 22: ...ided Calibration Solution If the calibration is stable after two weeks Turner Designs Hydrocarbon Instruments recommends checking at 4 week intervals 2 The flow cell should be cleaned periodically The cell calibration as shown on the HOME screen should be used as a primary reference in determining a cleaning schedule 3 The desiccant plug should be replaced upon turning pink or annually if no color...

Страница 23: ...open when the yellow valve handle is oriented vertically If your instrument has PVC wetted parts position the outlet valve handle downward and the inlet valve handle vertically See Appendix K 8 Turn on the Main Power Switch 9 Calibrate the monitor after allowing it to warm up for at least 15 minutes 6 3 REPLACEMENT PARTS See Appendix H for information on common replacement parts Improper installat...

Страница 24: ...hone Number Type of oil being detected The following checklist is provided so the appropriate preparations may be made prior to equipment start up Completion of the listed items is mandatory to assure proper installation and a properly functioning piece of equipment Although it may be tempting to compromise on the initial requirements history has proven that doing it right the first time pays off ...

Страница 25: ...iate 3 Provide free unrestricted drain for sample stream if possible If the system must be plumbed back into a pressurized process line the line pressure must be sufficient enough to activate the 0 5 psig 3 45 kPa g ball check valve installed on outlet of instrument CUSTOMER REQUIREMENTS ELECTRICIAN 1 Ensure environment will support a NEMA 4X type enclosure 2 Provide 100 130 200 250 VAC 50 60 Hz 5...

Страница 26: ...ed Technician Name System Name System S N System Value Access Keys Range Value Cal Solution Value HOME 0 0 000 998 Offset Value HOME 1 0 000 999 High Signal Value HOME 2 0 004 999 4 mA Output HOME 3 0 000 997 20 mA Output HOME 4 0 002 999 Cell Threshold Value HOME 7 0 000 100 Cell Delay HOME 8 30 sec 1 min 2 min 5 min 10 min 20 min 30 min Fluor Temp Comp HOME 9 0 000 100 ...

Страница 27: ...pare fuse is provided in the instrument enclosure Inlet Line Shut off Valve Directs sample flow to monitor When the yellow handle is vertical the valve is open and sample flows into the monitor When yellow handle is horizontal sample flow is stopped permitting calibration solutions to be injected into monitor via the Luer lock injection port Outlet Three Way Valve Directs sample flow from the outl...

Страница 28: ...time simply by clearing the obstruction The absence of a System Function Alarm F A is persuasive evidence that the electronics of the instrument are functioning properly In that case it is likely that the problem is mechanical has resulted from another system problem or from the operator s unfamiliarity with the monitor After handling all alarms see Appendix E the troubleshooting procedure works b...

Страница 29: ...rom this screen then ENT to toggle the device ON and OFF The device should go on when ON is selected and off when OFF is selected If it does not then be sure to check the pump device itself first and then check the terminal strip connections trained personnel ONLY When the test is finished return to the HOME screen and device control will revert to control by current monitor values This function c...

Страница 30: ...om the above screen press ENT CAL TEMP xx xC MAX TEMP xx xC Cal Temp This is the temperature of the calibration solution during the calibration procedure Max Temp This is the maximum process water temperature the instrument has measured since the original installation 9 From the above screen press ENT BLANK x x CAL STD xxx x Blank This is the stored blank fluorescence value taken during the calibr...

Страница 31: ...nd that the reading is between 1 and 10 Check the expiration date of the solution Controller is or has been in alarm Check active alarms and correct as required HOME screen displays OVER not blinking from over to OVER A steady OVER indicates that the sample reading is too high for the monitor s light detector This is related to the chemistry of the sample and displays that the sample readings are ...

Страница 32: ...on to test if the monitor is properly activating the control device Fuse has blown Replace fuse with spare located on the Main PCB Offset value ineffective i e HOME screen reading does not change when the Offset value is changed This is not usually cause for alarm as the HOME screen reading is a result of a combination of factors Do not attempt to change current settings unless you are certain som...

Страница 33: ... of Last Calibration Press ENT from HOME screen to read last calibration date THE HOME SCREEN READS XXX ppb ppm RFU T C Cell If ALM is blinking press ESC and record alarms PHYSICAL INSPECTION Is main power switch on YES NO Can LCD contrast be adjusted using the UP DOWN arrows YES NO Date flow cell was last cleaned With Cleaning Solu tion With Brush Turn main power to the instrument off and remove ...

Страница 34: ...HOME Ý Software Version HOME Ý ENT Raw Process water flowing for this step FS HOME Ý ENT Raw Stop flow and inject DI blank solution for this step FS HOME Ý ENT Raw Stop flow and inject Calibration solution for this step FS HOME Ý ENT ENT 1 Does AC relay Go Off On when ENT toggled HOME Ý ENT ENT ENT 1 Does DC output go Off On when ENT toggled HOME Ý ENT ENT ENT ENT Oper Hrs LED Flow HOME Ý ENT ENT ...

Страница 35: ... Temp H T 10 sec Water temp 60 C Water temp 60 C C D LED F A 1 min LED Off LED On No Sample Flow N F 5 min Flow Off Flow On 2 Measurement Function Alarms Refer to Table 3 for defaults and Figure 7 for electrical terminations Table 3 Measurement Function Alarms Alarm Delay Time Range Default Alarm Terminals High Signal H S 2 min 0 004 999 999 4 5 6 Cell Threshold C C 30 sec 1 min 2 min 5 min 10 min...

Страница 36: ...ailure in one part of the monitor causes what appears to be a failure in another part of the monitor For example If the LED light source is not working F A this condition may also trigger the Cell Threshold C C even if there is really nothing wrong with the cell condition E 4 Alarm History The alarm history can be viewed by pressing ï Left Arrow from the HOME screen This shows which alarms have be...

Страница 37: ...ner Designs Hydrocarbon Instruments representative or Turner Designs Hydrocarbon Instruments at 1 559 253 1414 Pressing ESC from the HOME screen allows the user to determine which function alarm is activated E 7 Measurement Function Alarm Definitions High Signal Alarm H S If the measurement level rises above the High Signal Alarm level and remains there for the 2 minute delay period an H S alarm w...

Страница 38: ...ortant that the offset value is entered correctly To determine this value perform the following steps 1 Ensure the Calibration Solution Value is set to the proper value 2 Ensure the Offset Value is set to 0 3 Allow non contaminated process water to flow through the instrument 4 Record readings every 10 seconds for a period of 5 minutes 30 readings total 5 Average the readings and enter the calcula...

Страница 39: ...m is activated alerting the operator that maintenance is required Cell Threshold values of 30 to 70 are typical 8 Cell Delay This value determines the time interval delay for activating the Cell Threshold DC output alarm The cell delay is activated when the Cell Threshold value is exceeded lower value for the Cell Delay period Cell Delay intervals of 30 sec 1 min 2 min 5 min 10 min 20 min and 30 m...

Страница 40: ... 8 Cell Delay Set cell transmission alarm delay 9 Fluor Temp Comp Set fluorescence cor rection factor Cell Calibration Initiate Cell calibration ï Alarm History Displays past alarm history ESC View Current Alarms Displays current active alarms From the HOME screen press to access the Date Time functions 0 Hour The correct hour of day must be entered Only numerical values 1 12 will be accepted 1 AM...

Страница 41: ...PPENDIX F SYSTEM VALUE PARAMETERS PN 101687 REV G TD 1000C Oil In Water Monitor Operation Manual 41 Time and Date 0 to 01 01 07 5 07 30 55AM 0 Hour 7 New 1 AM PM AM ENT to toggle 2 Min 20 New 3 Month 4 New 4 Date 14 New 5 Year 7 New ...

Страница 42: ...rom the HOME screen access the calibration data and the calibration sequence by pressing ENT Other screens are accessed from the HOME screen by pressing various keys on the keypad Go to the HOME screen by pressing the HOME key except during the calibration procedure To return to the HOME screen from calibration first press ESC to abort the calibration sequence G 1 2 Warning Screens There are warni...

Страница 43: ...history ï G 2 3 Up Down Arrows From HOME screen these arrows can be used to change LCD contrast ñ ò G 2 4 Escape Enter The ESC key is used to navigate to a previous screen abort calibration and view current alarms from the HOME screen The ENT key is used to accept numerical entries and other parameters and to initiate the change of a system value G 2 5 HOME Key The HOME key takes the user back to ...

Страница 44: ... ID To change the User ID contact your Turner Designs Hydrocarbon Instruments representative or Turner Designs Hydrocarbon Instruments Service Department at 1 559 253 1414 for assistance with the Master ID Once an ID has been entered if the keypad is not used for 15 minutes the monitor will automatically return to the HOME screen The ID will have to be entered again before the monitor values can b...

Страница 45: ...on Instruments representative or by calling Turner Designs Hydrocarbon Instruments at 1 559 253 1414 Common Replacement Parts Part Number Description Part Number Description 101063 60 mL Luer Lock Syringe 101795 TD1000C 2 Year Spares Kit 101665 TD1000C Calibration Kit 101815 Keypad Replacement 101666 Calibration Solution 101817 TD1000C Main PCB Replacement 101667 Desiccant Plugs Pkg of 3 101843 TD...

Страница 46: ...lid state electronic design The TD1000C contains five important components that it uses to make the fluorescence measurement 1 Light Source 2 Excitation Filter 3 Sample Cell 4 Emission Filter 5 Light Detector The TD1000C electronics and a highly sensitive light detector allow oil to be detected from the parts per million ppm to parts per billion ppb range Light Source The TD1000C utilizes a LED li...

Страница 47: ...TD1000C Oil in Water Monitor APPENDIX J FIGURES PN 101687 REV G TD 1000C Oil In Water Monitor Operation Manual 47 APPENDIX J FIGURES Figure 1 Front View ...

Страница 48: ...APPENDIX J FIGURES TD1000C Oil in Water Monitor 48 TD 1000C Oil In Water Monitor Operation Manual PN 101687 REV G Figure 2 Bottom View ...

Страница 49: ...TD1000C Oil in Water Monitor APPENDIX J FIGURES PN 101687 REV G TD 1000C Oil In Water Monitor Operation Manual 49 Figure 3 Left View ...

Страница 50: ...APPENDIX J FIGURES TD1000C Oil in Water Monitor 50 TD 1000C Oil In Water Monitor Operation Manual PN 101687 REV G Figure 4 Right View ...

Страница 51: ...TD1000C Oil in Water Monitor APPENDIX J FIGURES PN 101687 REV G TD 1000C Oil In Water Monitor Operation Manual 51 Figure 5 Back View ...

Страница 52: ...APPENDIX J FIGURES TD1000C Oil in Water Monitor 52 TD 1000C Oil In Water Monitor Operation Manual PN 101687 REV G Figure 6 Electrical Installation ...

Страница 53: ...TD1000C Oil in Water Monitor APPENDIX J FIGURES PN 101687 REV G TD 1000C Oil In Water Monitor Operation Manual 53 Figure 7 Electrical Installation 2 ...

Страница 54: ...PPENDIX K FIGURES PVC WETTED PARTS TD1000C Oil in Water Monitor 54 TD 1000C Oil In Water Monitor Operation Manual PN 101687 REV G APPENDIX K FIGURES PVC WETTED PARTS Figure 8 Front View PVC Wetted Parts ...

Страница 55: ...TD1000C Oil in Water Monitor APPENDIX K FIGURES PVC WETTED PARTS PN 101687 REV G TD 1000C Oil In Water Monitor Operation Manual 55 Figure 9 Bottom View PVC Wetted Parts ...

Страница 56: ...APPENDIX K FIGURES PVC WETTED PARTS TD1000C Oil in Water Monitor 56 TD 1000C Oil In Water Monitor Operation Manual PN 101687 REV G Figure 10 Left View PVC Wetted Parts ...

Страница 57: ...TD1000C Oil in Water Monitor APPENDIX K FIGURES PVC WETTED PARTS PN 101687 REV G TD 1000C Oil In Water Monitor Operation Manual 57 Figure 11 Right View PVC Wetted Parts ...

Страница 58: ...APPENDIX K FIGURES PVC WETTED PARTS TD1000C Oil in Water Monitor 58 TD 1000C Oil In Water Monitor Operation Manual PN 101687 REV G Figure 12 Back View PVC Wetted Parts ...

Страница 59: ...TD1000C Oil in Water Monitor APPENDIX K FIGURES PVC WETTED PARTS PN 101687 REV G TD 1000C Oil In Water Monitor Operation Manual 59 Figure 13 Electrical Installation PVC Wetted Parts ...

Страница 60: ...APPENDIX K FIGURES PVC WETTED PARTS TD1000C Oil in Water Monitor 60 TD 1000C Oil In Water Monitor Operation Manual PN 101687 REV G Figure 14 Electrical Installation 2 PVC Wetted Parts ...

Страница 61: ...ion as set during calibration It can be used to check proper calibration Calibration Temperature Cal Temp the temperature of the calibration solution during the calibration procedure Chemistry a science that deals with the composition structure and properties of substances and with the transformations that they undergo Cell Condition a measure of the percentage of light being transmitted through t...

Страница 62: ...e sample through the monitor Flow cell a small quartz tube within the sample block through which the sample flows as its fluorescence is being measured FL Fluorescence this value is the current raw non calibrated fluorescence measurement from the detector Fluorescence luminescence that is caused by the absorption of radiation at one wavelength followed by nearly immediate reradiation usually at a ...

Страница 63: ...rast how light or dark the characters appear on the LCD in relation to the background The contrast of the LCD can be adjusted on any screen except during calibration by pressing ñ or ò ñ makes the LCD darker and ò makes the LCD lighter LCD Liquid Crystal Display an electronic display that consists of segments of a liquid crystal whose reflectivity varies according to the voltage applied to them Li...

Страница 64: ...with no associated units of measurement Generally it takes the literal parts per meaning of a comparative ratio However in this text it will refer to a concentration measurement representing the number of parts of the hydrocarbon that exist in every billion parts of the process water It is a value of 10 9 This is equivalent to 1 drop of water diluted into 250 chemical drums 50 m3 or about three se...

Страница 65: ...he system consisting of the TD1000C monitor calibration kit calibration solution operation manual and the mounting back panel with inlet and outlet valves Troubleshooting the process of locating trouble and making repairs in machinery and technical equipment Turbidity thick or opaque with or as if with roiled sediment U Up Arrow the ñ key One of two arrow keys used to change LCD contrast The up ar...

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