MSA PrimaX IR Manuel D'utilisation page 26

Start-up and Calibration
4-20 mA is held at the sensor calibration level for two minutes to reduce the
chance of a nuisance alarm upon completion of a calibration procedure.
During calibration and this 2 minute period, the unit will not be detecting

any gas in the ambient area.
Alternately, the device can be commanded via HART to track the gas level dur-

ing calibration [see the Calibration Signal Enable/Disable command in the
HART Specification].
Once the calibration cap is removed it can take up to two minutes for gas to

diffuse and the device to read normal ambient levels.
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PrimaX IR
MSA
US