Calibration - Prosense PQ Series User Manual

If test fails the screen will indicate the result

Calibration

Once test completed screen will display back to Test menu items.
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
for 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). It is
possible to use calibration gas from 25%LEL to 75%LEL gas concentrations via adjusting
reference gas details on detector menu for calibrating flammable gas detectors 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. The gas flow rate must be 0,5lt/min for correct calibration.
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 select Calibration from menu:
Screen will show calibration options:
PRS-UM-HT-EN-Rev1.0-19.12.2022
Start Concentration
0%LEL
Peak Concentration
24%LEL
End Concentration
0%LEL
1. Alarm Settings
2. Calibrate
3. Configure
4. Information
5. Test
6. Exit
1. Set Zero
2. Set Span
3. Cancel Cal
4. Reference Gas
5. Cal. Interval
6. Previous Menu
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