RKI Instruments 35-3000RKA-LEL - Manual (Page 11)

Sample Draw Combustible Gas Detector • 11
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 combustible gas 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
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 reading of 0 %LEL (4 mA) at the monitoring device or a reading of 100 mV at
the transmitter test points. Investigate significant changes in the reading.
Monthly
This procedure describes a test to verify that the sample draw combustible gas detector
responds properly to the target gas.
Preparing for the response test
NOTE: This procedure describes the RKI calibration kit that includes a gas collection
bag. A calibration kit that uses a demand flow regulator is also available.
1. Verify that the monitoring device is reading 0 %LEL (4 mA).
If the reading is not 0, set the zero reading as described in the “Start Up” section on
page 10, then continue this procedure.
2. Connect the calibration kit sample tubing along with the tubing clamp to the fitting on
the gas collection bag.
3. Connect the sample tubing from the gas collection bag to the inlet line at or near the
INLET fitting.
Allow the sample draw pump to draw out any residual gas in the gas collection bag.
NOTE: This will cause a low flow alarm when the bag is empty. Normal operation of the
sample draw adapter will resume when the tubing is disconnected from the inlet
line.
4. Disconnect the calibration kit sample tubing from the inlet line.
5. Close the clamp right away. The clamp is attached to the calibration kit sample tubing.
6. Connect the tubing from the gas collection bag to the fixed flow regulator, then open
the clamp.
7. Screw the fixed flow regulator onto the calibration gas cylinder. The gas collection bag
begins to fill.