RKI Instruments 35-3000RKA-H2S - Manual (Page 10)

10 • Sample-Draw Hydrogen Sulfide Gas Detection
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 hydrogen sulfide 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 ppm (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 hydrogen sulfide gas
detector responds properly to the target gas.
Preparing for the response test
1. Verify that the monitoring device is reading 0 ppm (4 mA).
If the reading is not 0, set the zero reading as described in the “Start Up” section on
page 9, then continue this procedure.
2. Assemble the calibration kit as described in the Calibration section of this insert.
Performing 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. Connect the calibration tubing from the gas collection bag to the inlet line at or near
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 line.
2. After approximately one minute, verify that the reading at the monitoring device
stabalizes 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 the
Calibration section of this manual.
3. Remove the calibration tubing from the inlet line, then reconnect the inlet line.
Quarterly
Calibrate the sample-draw detector as described in the “Calibration” section on page 14 .