23.2 Sensor Module Calibration
The sensor module is calibrated before it leaves the factory. However,
you can also calibrate the sensor module. Allow it to warm up for two
hours before calibrating it. Calibration should be performed using
external equipment, using a two-point calibration for the 100 and
1000 ppm VOC sensor.
100 ppm and 1000 ppm range sensor module calibration. First
perform a zero gas calibration by applying fresh air to the sensor
module. If the module is configured for use with a pump, the fresh
air’s flow rate must be greater than the pump’s draw rate. A
calibration time of 1 minute is recommended. The other calibration
point requires exposure of the sensor to span gas. The span gas
concentration should be 10 ppm (for 100 ppm range) or 100 ppm (for
1000 ppm range) isobutylene, and calibration time is also 1 minute.
IMPORTANT!
Whenever you change the sensor head while the instrument is in
operation, follow this procedure:
Press and hold [+] until the screen says:
Change Sensor
Press [+]. The RAEGuard 2 performs a full startup.
If you leave the sensor head detached from the RAEGuard 2 for
more than 60 seconds, it goes into alarm and displays this message:
Sensor Fail:0
Replace the sensor head and follow the procedure above for
restarting it.
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