35-3010RKA-04H Sample-Draw Detector Head
Calibration, Oxygen Detector
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Setting the Fresh Air Reading
CAUTION:
This procedure may cause alarms at the controller. Take appropriate action to avoid
this, such as entering the calibration mode at the controller.
NOTE:
If you can verify a fresh air environment, it is not necessary to use the zero air
calibration cylinder to set the zero reading.
1. Screw the regulator into the zero air calibration cylinder.
2. Connect the calibration kit sample tubing to the regulator.
3. Connect the sample tubing from the regulator to the inlet line at or near the INLET fitting.
4. Allow the gas to flow for one minute.
5. Verify a voltmeter reading of 434 mV ± 2 mV at the test points as described in the Preparing
for Calibration section above.
6. If necessary, use a small flat-blade screwdriver to adjust the zero pot until the voltmeter
reading is 434 mV ± 2 mV.
7. Disconnect the sample tubing from the inlet line.
8. Unscrew the regulator from the zero air calibration cylinder. Leave the sample tubing
connected to the regulator.
Returning to Normal Operation
1. Reconnect the incoming sample line.
2. Wait 1 to 2 minutes to allow the calibration gas to be drawn out and the reading to stabilize.
3. Close the housing door.
4. Store the components of the calibration kit in a safe and convenient place.
