To zero calibrate the sensor:
1. Screw the sensor guard to the bottom of the sensor housing.
2. Place the green calibration cap over the sensor guard inlet so that it is flush with the bottom of the sensor guard and
completely covers the sensor guard inlet.
3. Attach the tubing to the plastic stem protruding through the green calibration cap.
4. Screw the regulator onto the top of the zero gas cylinder.
If a password is enabled, you will need to enter it to access the menu system.
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. Press EZ touch until Zero is displayed, and release.
6. Once the screen displays Zero in Progress, turn on zero gas flow by turning knob on the regulator.
7. Wait while the device displays Zero in Progress.
8. Once the zero calibration is complete, a Zero PASS or FAIL is displayed.
If PASS displays, the procedure is complete.
If FAIL displays, the procedure was unsuccessful (see 6.5 Troubleshooting).
9. Remove the zero calibration equipment from the device including the sensor guard and calibration cap.
Sensors with TruCal and have Diffusion Supervision enabled can go into Diffusion Supervision Fault if the green
calibration cap is left on after completing a zero calibration.
WARNING!
The green calibration cap must be removed from the sensor after a zero 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.
5.6 How to Calibrate XCell Sensors
See 5.7 How to Calibrate an Oxygen XCell Sensor for calibrating oxygen sensors.
NOTICE
If a password is enabled, you will not be able to proceed with the calibration without the password.
• To abort, press the EZ touch button or apply magnet over GM logo before applying target gas.
• In the event that a calibration cannot be completed, the user can acknowledge the FAIL by pressing the EZ
touch button or applying magnet to the GMI logo area until "Reset" is displayed and then release. The device
will revert to the settings of the last successful calibration.
If it is suspected that gases are present, it will be necessary to purge the sensor environment with zero air.
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5 Calibration US
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