RKI Instruments 35-3001-01-03 - Manual (Page 16)

12 • 35-3001-01-03 Methane Sample-Draw Detector
Maintenance
This section describes maintenance procedures. It includes preventive maintenance procedures.
This section also includes procedures to troubleshoot the sample-draw detector, replace
components of the sample-draw detector, and adjust the low flow setting.
Preventive Maintenance
This section describes a preventive maintenance schedule to ensure the optimum performance of
the sample-draw detector. It includes daily, monthly, and biannual procedures.
Daily Visual Checks
1. Verify that the Pilot LED is on.
2. Verify that the flowmeter indicates a flow rate of approximately 1.0 SCFH. If necessary use the
sensor flow control valve to adjust the flow rate to 1.0 SCFH. Turn the valve’s knob
counterclockwise to increase the flow and clockwise to decrease the flow.
3. Verify a display reading of 0 %vol at the controller. Investigate significant changes in the
display reading.
Monthly Response Test
This procedure describes a test to verify that the sample-draw detector responds properly to the
target gas.
NOTE: To reduce the response time of this test, use a short incoming sample line. If the sample-
draw detector’s sample line is long, connect a shorter line for this test. Make sure you
reconnect the sample line after you complete this procedure.
NOTE: Performing a response test on the sample-draw detector may cause alarms. Be sure to put
the controller into its calibration program or disable external alarms before performing
this test.
Preparing for the response test
NOTE: This procedure describes the RKI calibration kit that includes a demand flow regulator.
1. Verify that the display reading at the controller is 0 %vol.
If the display reading is not 0 %vol, set the zero reading as described in “Calibration” on
page 16, then continue this procedure.
Performing the response test
1. Screw the demand flow regulator into the calibration cylinder.
2. Connect the calibration tubing from the demand flow regulator to the inlet fitting. Gas will
begin to flow.
3. After approximately one minute, verify that the reading at the controller stabilizes within ±
20% of the concentration of the test sample. If the reading is not within ± 20% of the test
sample, calibrate the sample-draw detector as described in “Calibration” on page 16.
4. Remove the calibration tubing from the inlet fitting, then reconnect the sample tubing to the
inlet fitting.