Honeywell AreaRAE Plus User Manual page 91

Refer to RAE Systems Technical Note TN-114 for a list of biased sensors.
Testing the Gamma Radiation Sensor
The gamma radiation sensor does not require user calibration. To check whether the sensor is
operational, place a gamma check-source on the upper half of the rear of the AreaRAE Plus/Pro
equipped with a gamma sensor. The reading should increase.
Zero Calibration for Parts-Per-Billion (ppb) PID Sensor
IMPORTANT! The parts-per-billion PID sensor for volatile organic compounds (VOCs) should not
be zeroed in fresh air. VOCs are normally present in ambient air, so zeroing the sensor in
ambient air will not allow for a true zero to be set. The parts-per-billion PID sensor should be
zeroed with ambient air using a charcoal filter or a VOC zeroing tube. Refer to the procedure on
See "VOC Zero Calibration Procedure for Enhanced Linearity with Extended- Range and ppb PID
Sensors" on page 92 for more information..
Fresh Air Calibration
This procedure determines zero points of most sensors. The AreaRAE Plus/Pro should be zero-
calibrated in clean air with 20.9% oxygen or with a cylinder of clean zero air.
Note: If you use a zero air cylinder, you must connect it directly to the filter that is attached to
the instrument's inlet.
At the Calibration menu, select "Fresh Air" by pressing [Y/+] once to enter fresh air calibration.
After a timer countdown, the zero calibration is done. The LCD displays the sensor names and
tells you whether each calibration passed or failed, followed by the sensor readings.
AreaRAE 90 User Manual