RKI Instruments 35-3000RK-LEL - Manual (Page 13)

35-3000RK-LEL Combustilbe Gas Sample-Draw Detector • 13
3. Perform a zero operation at the controller. See the controller operator’s manual for
instructions to perform a zero 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.
Monthly Visual Checks
1. Verify that the pilot light is on.
2. Verify that the flowmeter indicates a flow rate of approximately 1.5 SCFH.
If necessary use the bypass valve or flow adjust potentiometer to adjust the flow rate
to 1.5 SCFH.
3. Verify a display reading of 0 %LEL 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 dispensing valve
and a gas collection bag. A calibration kit that uses a demand flow regulator is
also available.
1. Verify that the display reading a the controller is 0 % LEL.
If the display reading is not 0 % LEL, set the zero reading as described in
“Calibration” on page 18, then continue this procedure.
1. Follow the instructions in the controller’s operator’s manual for entering calibration
mode.
2. Connect the calibration kit sample tubing to the fitting on the gas collection bag and
run the tubing through the tubing clamp provided with the calibration kit.