5.8 How to Calibrate an IR Sensor
A full span calibration is not required for the IR Sensors. Any degradation of the sensor's performance is associated with slight
drifts in its zero response. Restoring the sensor's zero is typically sufficient. Note that for zeroing of the IR700 sensor, zero
gas is required. Air contains CO
2
and cannot be used. Nitrogen is recommended as the zero gas. The nitrogen cylinder P/N is
1400262-17.
See 5.5 How to Zero Calibrate XCell and IR Sensors for zero calibration instructions.
If a full calibration of the IRSensor is required, a larger calibration cap is used and covers the entire sensor guard
during calibration. The calibration cap must be removed after completing the zeroing and/or spanning procedure.
NOTICE
If the calibration cap cannot be used (such as for a remote sensor application), ambient wind conditions must be minimized
during calibration to avoid a calibration with increased sensitivity.
5.9 How to Calibrate a Passive Sensor (Catalytic Bead or MOS)
WARNING!
The sensor calibration cup must be removed from the sensor after calibration. Failure to do so could restrict gas flow to the
sensor and result in erroneously low readings.
Failure to follow this warning can result in serious personal injury or death.
• If a password is enabled, you will need to enter it to access the menu system.
• If the sensor is fitted with a sensor guard, calibration must be performed with the sensor guard in place.
• If it is suspected that gases are present, it will be necessary to purge the sensor environment with zero air.
To calibrate sensor:
1. Attach a regulator to the zero air cylinder (if using) and the calibration cylinder.
2. Attach the plastic calibration cup (P/N1400152-1 or 1400154) to the bottom of the sensor if not already installed.
3. Attach the tubing to the plastic stem protruding through the calibration cup.
4. Push the other end of the tubing over the zero cylinder regulator. Ensure the tubing completely covers the gas outlet.
5. Press EZ touch until Calibration is displayed, and release the touch.
6. Turn on zero gas flow by turning knob on the regulator (if using).
7. Unit will start flashing the sensor life. Tap the EZ Touch if you want to reset the sensor life.
8. Wait while the device displays “Zero in Progress”.
9. Once the Zero Calibration is complete, remove the tubing from the calibration cup inlet.
10. The display will show “Apply Gas”. Attach tubing for calibration gas and turn on the regulator.
11. Display will show “Calibration in Progress”.
12. “Calibration Complete. Remove Gas” will show when span is complete.
13. Turn off the calibration gas regulator. Remove the calibration equipment from the device, including the calibration cup.
Unit will return to normal operation.
If “Cal Fail” and fault code displayed, the procedure was unsuccessful. See 6.5 Troubleshooting.
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5 Calibration US
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