RKI Instruments 35-3001-06-01 - Manual (Page 16)

12 • 35-3001-06-01 Combustible Gas/Oxygen Sample-Draw Detector
reading is not 0 %LEL for the combustible channel or 20.9% for the oxygen channel, continue
with step 3.
3. Perform a zero (fresh air) operation at the controller. See “Setting the Zero Reading” on
page 17 (for IR LEL sensor), “Setting the Fresh Air Reading” on page 18 (for oxygen sensor),
and the controller operator’s manual for instructions to perform a zero (fresh air) operation.
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 quarterly 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 clockwise
to increase the flow and counterclockwise to decrease the flow.
3. Verify a display reading of 0 %LEL for the combustible channel and 20.9% for the oxygen
channel 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 %LEL for the combustible channel and
20.9% for the oxygen channel.
If the display reading is not 0 %LEL for the combustible channel or 20.9% for the oxygen
channel, set the zero reading as described in “Calibration, IR LEL Sensor” on page 17 or
“Calibration, Oxygen Sensor” on page 18, then continue this procedure.
Performing the response test
1. Screw the demand flow regulator into the combustible gas calibration cylinder.