Maintenance – RKI Instruments 65-2498RK User Manual
Page 11
65-2495RK/65-2498RK H
2
S Detector • 7
Maintenance
This section describes maintenance procedures. It includes preventive maintenance,
troubleshooting, and component replacement procedures.
Preventive Maintenance
This section describes a preventive maintenance schedule to ensure the optimum
performance of the H
2
S detector. It includes daily, monthly, and quarterly procedures.
Daily
Verify a display reading of 0 ppm at the controller. Investigate significant changes in the
display reading.
Monthly
This procedure describes a test to verify that the H
2
S detector responds properly to the
target gas. It describes the test using a calibration kit that includes a calibration cup,
calibration gas, sample tubing, and a fixed flow regulator with an on/off knob. RKI
Instruments, Inc. recommends using a 0.5 LPM (liters per minute) fixed flow regulator.
WARNING: Failure to use the recommended calibration gas flow rate will result in an
inaccurate reading.
NOTE:
Performing a response test on the H
2
S 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
1.
Place the controller into its calibration program or disable external alarms.
2.
Verify that the controller display reading for the channel you are testing is 0 ppm.
If the display reading is not 0 ppm, set the zero (fresh air) reading of the detector as
described in the Start Up section of this manual, then continue this procedure.
3.
Screw the regulator into the calibration cylinder. Make sure the regulator is off. It is off
when the on/off knob is turned all the way clockwise.
4.
Screw the calibration cup onto the bottom of the H
2
S detector.
5.
Use the sample tubing to connect the regulator to the calibration cup.
Performing the response test
1.
Turn the regulator’s on/off knob counterclockwise to open the regulator. Gas will
begin to flow.
2.
Allow the gas to flow for two minutes, then verify that the reading is within ± 20% of
the cylinder gas concentration.
NOTE:
If the reading is not within ± 20% of the correct response reading, calibrate the
detector as described in “Calibration” on page 12.
3.
Turn the regulator’s on/off knob clockwise to close the regulator.
4.
Unscrew the regulator from the calibration cylinder.