Calibration - Prosense PQ Series Installation And User Manual

Calibration

It is recommended to periodically carry out calibration to ensure correct operation. Prosense
PQ series detector calibration includes two steps as zero and span calibration. It is possible to
perform each step independently. Prosense recommends to perform both calibration steps to
have correct calibration. Detector should be powered and stabilized for at least 4 hours before
calibration. During the calibration phases the detector output is inhibited (default 3mA) to
avoid false alarms. Zero calibration of infrared sensors should be done with N2 and zero
calibration of other sensors should be done with zero air (O2 and N2 gas mixtures). For
Flammable gas calibration use a calibration gas concentration of between 25%LEL and 75%LEL
to ensure that the required accuracy can be attained. It is necessary to use international
tracable gases.
To calibrate the detector, use an appropriate span gas cylinder, constant flow regulator and
Prosense Gas Cap. Calibration gas should be applied with 0.5 lt/min flow rate.
It is recommended to use a compressed air cylinder (20.9%Vol oxygen) to perform the zero
calibration if the area where the detector is located contains any residual amount of the
target gas. If no residual gas is present then the background air can be used to perform the
zero calibration.
To perform calibration procedure a hand terminal or screen is necessary. Attach hand
terminal to detector and press Enter to reach menu. The screen will request password
information:
The default password is 1234. If user changed the default password use updated password.
You need to set values via using up and down keys. Once the value is set press Enter again to
confirm and move to the next digit. The digit confirmed will made invisible by detector
program:
PRS-UM-PQ-EN-Rev.05-18.06.2020
PASSWORD
0
PASSWORD
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40