MSA PrimaX IR Manuel D'utilisation page 20

Start-up and Calibration
Calibrations
General
The calibration must be done at regular intervals in accordance with applicable na-
tional and regional regulations.
The device is calibrated at the factory. Nevertheless, it is recommended to re-
calibrate the device after installation. New sensors should be calibrated more often
until the calibration records prove sensor stability. The calibration frequency can
then be reduced to the schedule set by the safety officer or plant manager.
Signal
The 4 - 20 analog signal is available within 1 minute of power-on.
CAUTION
For maximum accuracy, the device should be powered for at least
60 minutes before attempting calibration to allow for temperature stabi-
lization.
CAUTION
Carry out the calibration during commissioning as well as at regular in-
tervals. This ensures optimum operation of the sensor.
It is recommended that all cali b ration components are connected before
starting a calibration as it is necessary to apply test gas at the appropri-
ate time as shown in fig. 14.
Although the device is factory-calibrated, it is good practice to calibrate the unit
once it is installed in its final environmental destination.
As with any type of gas monitor, the only true check of its performance is to apply
gas directly to the sensor. New sensors should be calibrated more often until the
calibration records prove sensor stability. The calibration frequency can then be re-
duced to the schedule set by the safety officer or plant manager.
Span gas selections are shown in chapter 4.3.
(1) Read all calibration instructions before attempting an actual calibration.
(2) Identify and become familiar with all of the calibration components.
Prior connection of the calibration components will make it easier to cali-

brate the unit.
CAUTION
Failure to follow the above can result in inaccurate calibration.
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PrimaX IR
MSA
US