RKI Instruments 35-3000RK-LEL - Manual (Page 14)

14 • 35-3000RK-LEL Combustible Gas Sample-Draw Detector
3. Disconnect the incoming sample line from the sample-draw detector’s inlet fitting,
then connect the sample tubing from the gas collection bag to the inlet fitting.
Allow the sample-draw pump to draw out any residual gas in the gas collection bag.
4. Close the tubing clamp.
NOTE: This step will cause a low flow alarm.
5. Disconnect the calibration kit sample tubing from the inlet fitting.
NOTE: If you can verify a fresh air environment, it is not necessary to use a zero air
calibrating sample to set the zero reading at the controller. If you can verify a
fresh air environment, go to the next section, Setting the Zero Reading.
6. Screw the dispensing valve onto the test gas cylinder.
7. Connect the tubing from the gas collection bag to the dispensing valve, then open the
clamp.
8. Open the dispensing valve. The gas collection bag begins to fill.
9. Close the dispensing valve when the gas collection bag appears full.
10. Close the tubing clamp, then disconnect the sample tubing from the dispensing valve.
11. Remove the dispensing valve from the test gas cylinder.
Performing the response test
1. Connect the calibration tubing from the gas collection bag to the INLET fitting.
The sample-draw detector’s pump automatically begins pulling the test sample from
the gas collection bag when you connect the tubing to the INLET fitting.
2. After approximately one minute, verify that the reading at the controller stabilizes
within ± 10% of the concentration of the test sample. If the reading is not within ± 10%
of the test sample, calibrate the sample-draw detector as described in “Calibration” on
page 18.
3. Remove the calibration tubing from the INLET fitting, then reconnect the sample
tubing to the INLET fitting.
Quarterly Calibration
RKI Instruments recommends calibrating the combustible gas sample-draw detector
quarterly. Some applications may require a more or less frequent calibration schedule
depending on environmental conditions, frequency of gas exposure, and other factors.
Calibrate the sample-draw detector as described in “Calibration” on page 18.
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended
action for problems you may encounter with the sample-draw detector.
NOTE: This troubleshooting guide describes sample-draw detector problems only. See
the controller Operator’s Manual if the controller exhibits any problems.