65-2428 H
2
S Detector • 11
Calibration
This section describes how to calibrate the H
2
S detector. It includes procedures to prepare
for calibration, set the zero reading, set the response reading, and return to normal
operation. It describes calibration 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.
Preparing for Calibration
1.
Screw the calibration cup onto the bottom of the H
2
S detector.
2.
Screw the regulator into the zero air calibration cylinder.
3.
Use the sample tubing to connect the regulator to the calibration cup.
NOTE:
If you can verify that the H
2
S detector is in a fresh air environment, you do not
need to apply zero air to the detector before adjusting the zero reading.
4.
Put the controller into its calibration program.
Setting the Zero Reading
1.
Follow the directions in the controller operator’s manual for setting the zero reading.
2.
When the instructions call for applying zero air to the detector, turn the regulator’s
on/off knob counterclockwise to open it. Gas will begin to flow.
3.
Allow the gas to flow for two minutes.
4.
Set the zero reading according to the controller operator’s manual.
5.
Turn the regulator’s on/off knob clockwise to close it.
6.
Unscrew the regulator from the zero air calibration cylinder. Leave the sample tubing
connected to the regulator and the calibration cup.
Setting the Response Reading
1.
Screw the regulator into the calibration gas cylinder.
2.
Follow the directions in the controller operator’s manual for setting the response
reading.
3.
When the directions call for exposing the detector to gas, turn the regulator’s on/off
knob counterclockwise to open it. Gas will begin to flow.
4.
Allow the gas to flow to the detector for 2 minutes.
5.
Set the response reading according to the controller operator’s manual.
6.
After setting the response reading, unscrew the regulator from the cylinder and
remove the calibration cup from the detector.
NOTE:
For convenience, leave the regulator and calibration cup connected by the
sample tubing.
Returning to Normal Operation
1.
Allow about 45 seconds for the gas reading to decrease below the alarm points and
then return the controller to normal operation.
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