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35-3001A-01-03 Methane Sample-Draw Detector • 5

counterclockwise to increase the flow and clockwise to decrease the flow.

Status LEDs

Two status LEDs are above the flowmeter. They are also visible through the window in the housing 
door. The green Pilot LED is on when the sample-draw detector is receiving power from the 
controller. The red Fail LED is on when the sample flow rate is below the low flow level.

Pressure Switch

The pressure switch is mounted to the back of the flowmeter circuit board. The pressure switch 
monitors the flow rate of the incoming gas sample.

If the flow rate falls below the preset low flow level, the pressure switch causes the Fail LED to 
turn on and interrupts the signal from the detector. The interrupted detector signal causes a fail 
condition at the controller. The low flow level is factory-set at 0.6 SCFH (±0.1 SCFH). See 
“Adjusting the Low Flow Setting” on page 16 to adjust this setting.  

Pump Reset Switch

The pump reset switch is located to the left of the status LEDs. When a low flow condition occurs, 
the pump will be shut off. To reset the low flow condition and start the pump again, press and hold 
the pump reset switch for about 2 seconds, then release. 

Hydrophobic Filter

The hydrophobic filter is located toward the bottom left of the main circuit board. The filter 
prevents particulates and water in the incoming gas sample from damaging the flow and detection 
systems. Replace the filter when it appears dirty, discolored, or clogged.

Pump

The pump is mounted to the right side of the main circuit board. The pump pulls the gas sample 
into the sample-draw detector. The pump operates on 24 VAC, which is generated from the 24 
VDC supplied by the controller.

IR Methane Sensor/IR Methane Sensor PCB

The methane sensor is an infrared type plug-in detector. Infrared combustible detectors are 
generally used instead of the catalytic combustible detectors in applications where there may be 
catalyst poisons such as silicone present or where oxygen is not present in the monitoring 
environment.

The methane sensor is installed in the IR methane flow block and the IR methane flow block is 
mounted to the middle of the main circuit board. A small circuit board, the IR methane sensor PCB, 
with a 4-wire cable mates to the IR methane sensor and retains it in the flow block. The cable is 
wired to the main PCB. The IR methane sensor PCB allows you to replace the sensor without 
disconnecting the wiring. 

Содержание 35-3001A-01-03

Страница 1: ...www rkiinstruments com 35 3001A 01 03 Methane Sample Draw Detector Operator s Manual Part Number 71 0447 Revision P1 Released 10 30 17...

Страница 2: ...riodic calibration and maintenance of the detector is essential for proper operation and correct readings Please calibrate and maintain this detector regularly Frequency of calibration depends upon th...

Страница 3: ...eplacement 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 REPRESENTATIO...

Страница 4: ...Draw Detector to a Controller 9 Start Up 11 Introducing Incoming Power 11 Setting the Zero Reading 11 Maintenance 12 Preventive Maintenance 12 Troubleshooting 13 Replacing Components of the Methane Sa...

Страница 5: ...e operation of the 35 3001A 01 03 and to minimize the risk of personal injury Be sure to maintain and periodically calibrate the 35 3001A 01 03 as described in this manual Table 1 Specifications Targe...

Страница 6: ...or PCB IR CH4 Flow Block W L E L G B R Pilot LED Fail LED Sensor Flow Control Valve W Interconnect Terminal Strip Pump Reset Switch Flowmeter B G AMP 2 S S AMP 1 R W G OXY Hydrophobic Filter Particle...

Страница 7: ...mple fittings accept 1 4 in rigid tubing See the Installation section on page 7 to connect tubing to the sample fittings Particle Filter A particle filter with a tubing stub on one end is shipped with...

Страница 8: ...t corner of the main circuit board Use the pump connector to connect the pump to the main circuit board NOTE The pump is factory wired to the main circuit board See Installation on page 7 for all wiri...

Страница 9: ...gain press and hold the pump reset switch for about 2 seconds then release Hydrophobic Filter The hydrophobic filter is located toward the bottom left of the main circuit board The filter prevents par...

Страница 10: ...just the amplifier s gas response output during the calibration procedure Turn the adjustment screw clockwise to increase the span output and counterclockwise to decrease the span output CAUTION The a...

Страница 11: ...owing when you select the mounting site Is there enough room to open the housing door and make wiring and tubing connections at the bottom of the housing Make sure there is sufficient room to perform...

Страница 12: ...g components 4 Connect a length of sample tubing to the other side of the particle filter and route it to the sampling area 1 4 O D rigid polypropylene Teflon or flexible polyurethane tubing may be us...

Страница 13: ...t to seal the connection between the tubing and the inlet fitting 3 Hand tighten the nut on the exhaust fitting so the ferrules clamp on the tubing If the tube nut is removed see Figure 6 for the arra...

Страница 14: ...ing the Sample Draw Detector to a Controller 9 If shielded cable is used connect the cable s drain wire to an available chassis earth ground at the controller RKI controllers typically have a ground s...

Страница 15: ...this test 7 Verify that the incoming sample line is not leaking To test the sample line press and hold the reset switch and plug the open end of the sample line with your thumb If the flowmeter ball d...

Страница 16: ...ay reading of 0 volume at the controller or a reading of 100 mV at the amplifier test points Investigate significant changes in the display reading Monthly Response Test This procedure describes a tes...

Страница 17: ...n a safe place Biannual Calibration Calibrate the sample draw detector as described in Calibration on page 18 Troubleshooting The troubleshooting guide describes symptoms probable causes and recommend...

Страница 18: ...nt demand flow regulator to determine if the original one is functioning properly 3 If necessary set the correct flow rate with the sensor flow control valve 4 If you cannot set the correct flow rate...

Страница 19: ...om the main circuit board 7 Install the new amplifier in the same orientation as the old amplifier See Figure 1 8 Reinstall the screw lock washer and flat washer you removed in step 5 9 Install the de...

Страница 20: ...the particle filter 2 Disconnect the particle filter from the tubing stub 3 Install the new particle filter onto the tubing stub Be sure the arrow on the particle filter is pointing toward the inlet...

Страница 21: ...kwise Repeat steps 3 and 4 if necessary 5 Use the sensor flow control valve to set the flow to 1 0 SCFH 6 Make sure the sample draw detector s Fail LED is off Removing the Particle Filter s Tubing Stu...

Страница 22: ...libration 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 calibrati...

Страница 23: ...next section Setting the Response Reading 5 Disconnect the sample tubing from the inlet line 6 Unscrew the regulator from the zero air calibration cylinder Setting the Response Reading 1 Screw the re...

Страница 24: ...K Hydrophobic filter 33 0167RK Particle filter 57 1053RK 10 Amplifier 61 5041RK CH4 Infrared methane sensor plug in type vol range 71 0447 Operator s Manual 35 3001A 01 03 Sample Draw Detector 81 0013...

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