RKI Instruments 65-2427RKSS-05 - Manual (Page 17)

65-2427RKSS-05 H
2
S Detector • 13
Setting the Zero Reading
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.
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.
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.
7. Leave the sample tubing connected to the regulator and the calibration cup.
NOTE: Depending on the size of your zero air cylinder, it is possible that you will have a
different regulator for the zero air cylinder and the H
2
S gas cylinder. If necessary
to fit the H
2
S calibration gas cylinder, change the regulator.
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 (span).
3. When the directions call for exposing the detector to gas, turn the regulator’s on/off
knob counterclockwise to open it.
4. Allow gas to flow for 2 minutes.
5. Set the response reading according to the controller operator’s manual.
6. After setting the response reading, turn the regulator’s on/off knob clockwise to close
it.
7. Unscrew the regulator from the cylinder.
8. Remove the calibration cup from the detector.
NOTE: For convenience, leave 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.
NOTE : If you do not allow the gas reading to decrease below the alarm points, then
unwanted alarms may occur.
2. Verify that the controller display reading decreases and stabilizes at 0 ppm H
2
S.
3. Store the components of the calibration kit in a safe and convenient place.