Figure 32 Calibration Curve
The Sensor Span Value (i.e. Cal Level) in the device menu should be the same as the concentration listed on the calibration
gas cylinder.
5.5 How to Zero Calibrate XCell and IR 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 unit will revert to the
settings of the last successful calibration.
WARNING!
The regulator used with the zero gas cylinders should not be the same as the regulator used for the target gas. The zero gas
regulator can be contaminated with the target gas over time, and thus raise the detection baseline and make the sensor less
sensitive to the target gas.
Failure to follow this warning can result in serious personal injury or death.
If there is no target gas in the atmosphere around the sensor, using a zero gas cylinder is optional. Note that, since
air contains CO
2
, a zero gas cylinder is required for zeroing an IR 700 sensor. For IR700 sensors, nitrogen is
recommended as the zero gas.
68
US 5 Calibration
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