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RKI Instruments 65-2380, Operator'S Manual

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RKI Instruments 65-2380 Operator'S Manual Download Page 18

18

 •

 Calibration Frequency

NOTE:

When a transmitter is first powered up with a new amplifier, the initial 
output may be either high or below zero depending on the setting of the zero 
pot. Be sure to make arrangements so that this does not cause unwanted 
alarms.

10. Turn on power to the controller.

11. Turn on the controller and place it into normal operation.

12. Allow the transmitter to warm-up for 5 minutes.

13. Calibrate the transmitter as described in “Calibration” on page 18 of this manual.

Calibration Frequency

Although there is no particular calibration frequency that is correct for all applications, a 
calibration frequency of every 6 months is adequate for most MPS combustible gas transmitter 
applications. Unless experience in a particular application dictates otherwise, RKI Instruments, 
Inc. recommends a calibration frequency of every 6 months. 
If an application is not very demanding, for example detection in a clean, temperature controlled 
environment where calibration adjustments are minimal at calibration, then a calibration 
frequency of every 9 to 12 months is adequate. 
If an application is very demanding, for example if the environment is not well controlled, then 
more frequent calibration than every 6 months may be necessary. 

Calibration

This section describes how to calibrate the combustible gas transmitter. It includes procedures to 
prepare for calibration, set the zero reading, set the response reading, and return to normal 
operation.

WARNING: The controller is not an active gas monitoring device during the calibration 

procedure.

NOTE:

The following procedure assumes the use of a calibration kit which includes a 
calibration gas cylinder, a 0.5 LPM fixed flow regulator with an on/off knob, a 
calibration cup for the detector, and a short piece of sample tubing to connect the 
regulator to the calibration cup.

NOTE: During calibration, the detector must be calibrated with a cylinder of methane in a 

background of real air containing argon and CO

2

. Only use the RKI-provided 

calibration cylinder 81-9070RK-03. 

Summary of Contents for 65-2380

Page 1: ...RKI Instruments Inc www rkiinstruments com 65 2380 Molecular Property Spectrometer Combustible Gas Detector Operator s Manual Part Number 71 0595 Revision P2 Released 10 14 22 TM ...

Page 2: ...h Periodic calibration and maintenance of the transmitter is essential for proper operation and correct readings Please calibrate and maintain this transmitter regularly Frequency of calibration depends upon the type of use you have and the sensor types For most applications typical calibration frequencies are between 6 and 12 months but can be more often or less often based on your usage ...

Page 3: ...ndicates the full extent of our liability and we are not responsible for removal or replacement costs local repair costs transportation costs or contingent expenses incurred without our prior approval THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES AND REPRESENTATIONS EXPRESSED OR IMPLIED AND ALL OTHER OBLIGATIONS OR LIABILITIES ON THE PART OF RKI INSTRUMENTS INC INCLUDING BUT N...

Page 4: ...e Gas Transmitter 10 Wiring the Combustible Gas Transmitter 11 Startup 13 Introducing Incoming Power 13 Setting the Zero Reading 13 Maintenance 14 Preventive Maintenance 14 Troubleshooting 15 Replacing the MPS LEL Sensor 16 Calibration Frequency 18 Calibration 18 Preparing for Calibration 19 Setting the Zero Reading 19 Setting the Response Reading 20 Returning to Normal Operation 20 Parts List 21 ...

Page 5: ... 1 Detection Ranges and Accuracy Target Gas Formula Detection Range Accuracy at 50 LEL Butane C4H10 0 100 LEL 5 LEL Ethane C2H6 0 100 LEL 5 LEL Hydrogen H2 0 100 LEL 5 LEL Isobutane HC CH3 3 0 100 LEL 5 LEL Isobutylene C4H8 0 100 LEL 5 LEL Isopropanol C3H8O 0 100 LEL 10 LEL Methane CH4 0 100 LEL 3 LEL Methyl Ethyl Ketone C4H8O 0 100 LEL 5 LEL Octane C8H18 0 100 LEL 5 LEL Pentane C5H12 0 100 LEL 5 ...

Page 6: ...ications High concentrations of hydrogen sulfide H2S or silicones present where sensor poisoning is a common problem High humidity environments where catalytic or IR sensors may not hold up Environments more likely to have mixtures of hydrocarbons present Table 2 Specifications Area Classification Explosion proof for Class I Groups B C and D Operating Temperature Range 20ºC to 50ºC 4ºF to 122ºF Hu...

Page 7: ...ation as often as catalytic combustible sensors It also responds accurately to 14 different combustible gases This section describes the components of the combustible gas transmitter The transmitter is a 4 20 mA type detector head It consists of the combustible gas detector amplifier and junction box Figure 1 Component Locations Amplifier J Box R G LEL PWR SIG W B S ZERO MPS LEL Detector SPAN Sens...

Page 8: ...he cover on the front of the junction box to access the interior of the junction box The detector and amplifier are factory installed in the junction box Three spacers installed on the back of the junction box control the distance of the junction box from a mounting surface and ensure that there is enough room to install a calibration cup on the detector during calibration Amplifier The amplifier ...

Page 9: ...esh air output during the start up and calibration procedures Turn the adjustment screw clockwise to increase the zero output and counterclockwise to decrease the zero output Span Pot The span pot is located to the right of the zero pot see Figure 2 Use a small flat blade screwdriver to turn the span pot s adjustment screw and adjust the amplifier s gas response output during the calibration proce...

Page 10: ... where the transmitter is not likely to be bumped or disturbed Make sure there is sufficient room to perform start up maintenance and calibration procedures Select a site where the target gas is likely to be found first For lighter gases mount the detector near the ceiling for heavier gases mount the detector near the floor Figure 3 Mounting the Combustible Gas Transmitter 2 At the monitoring site...

Page 11: ... conduit hub of the junction box 7 Pull out the controller terminal strip and connect the three wires to the terminal strip as follows see Figure 11 Connect the positive wire to the PWR SIG terminal Connect the signal wire to the PWR SIG S terminal Connect the negative wire to the PWR SIG terminal CAUTION If shielded cable is used leave the cable shield s drain wire disconnected and insulated at t...

Page 12: ...to an available chassis earth ground at the controller RKI controllers typically have a ground stud that can be used to ground the cable s drain wire Red Amplifier Transmitter Cable Shield DC Ground 24 VDC 4 20 mA In S Controller or Recording Device MPS LEL Detector Detector Wires Green White J Box B R W G L EL PWR SI G Black S Figure 4 Wiring the Combustible Gas Transmitter to a Controller ...

Page 13: ...is determined to be non hazardous Keep the junction box cover tightly closed during operation NOTE If you can verify that the combustible gas transmitter is in a fresh air environment you do not need to apply zero air to the detector before adjusting the zero reading The procedure below describes applying zero emission air usually called zero air using a calibration kit that includes a calibration...

Page 14: ... convenience leave the sample tubing connected to the regulator and the calibration cup 15 Store the components of the calibration kit in a safe and convenient place 16 Remove the voltmeter leads from the test points 17 Secure the junction box cover to the junction box Maintenance This section describes maintenance procedures It includes preventive maintenance troubleshooting and component replace...

Page 15: ...etector 5 If the fail condition continues contact RKI for further instruction Slow or No Response Dif ficult or Unable to Cali brate Unable to accurately set the zero or response reading during calibration Transmitter requires frequent calibration NOTE Under normal circumstances the transmitter requires calibration once every 6 months NOTE Some applications may require a more frequent calibration ...

Page 16: ...nvironmental conditions apply thread sealant or Teflon tape to the hub and or detector threads to seal them 8 Connect the detector leads to the detector terminal strip as shown in Table 4 below and Figure 11 on page 12 of this manual 9 Reinstall the detector terminal strip into its socket 10 Reinstall the junction box cover 11 Turn on or plug in power to the controller 12 Turn on the controller an...

Page 17: ...the amplifier Make sure the amplifier is seated flat in the junction box 8 Install the new amplifier into the junction box with the screw lock washer and flat washer you removed in Step 5 above 9 Install the detector and controller terminals strips into their sockets on the new amplifier as shown in Figure 11 on page 12 of this manual If controller leads or detector leads were removed during this ...

Page 18: ...n in a clean temperature controlled environment where calibration adjustments are minimal at calibration then a calibration frequency of every 9 to 12 months is adequate If an application is very demanding for example if the environment is not well controlled then more frequent calibration than every 6 months may be necessary Calibration This section describes how to calibrate the combustible gas ...

Page 19: ...alibrating sample of 50 LEL and a fullscale setting of 100 LEL the correct output is 300 mV 300 mV 50 100 X 400 100 5 Screw the calibration cup onto the detector housing 6 Use the sample tubing to connect the regulator to the calibration cup 7 Place the controller into its calibration mode or disable external alarms NOTE Calibrating the combustible gas transmitter may cause alarms Be sure to put t...

Page 20: ...ute and verify that the reading matches the response reading 2 mV you determined earlier If necessary use the span pot on the amplifier to adjust the reading to match the correct response reading 5 Turn the regulator s on off knob clockwise to close the regulator 6 Unscrew the regulator from the calibration cylinder Returning to Normal Operation 1 Remove the voltmeter leads from the amplifier test...

Page 21: ...65 2380 MPS transmitter includes detector junction box and amplifier 71 0595 65 2380 Combustible Gas Detector Operator s Manual this document 81 1051RK Regulator with gauge and knob 0 5 LPM for 103 liter calibration cylinders cylinders with internal threads 81 1103RK Calibration cup 81 9070RK 03 Calibration cylinder 50 LEL methane in real air 103 liter 81 F076RK Cal kit 103 liter cylinder of 50 LE...

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