A calibration cap is recommended for sensor calibration.
Connect power to the device at least one hour before attempting a calibration.
Carry out the calibration during commissioning as well as at regular intervals. This ensures
optimum operation of the sensor.
It is recommended that all calibration components are connected before starting a calibration
as it is necessary to apply test gas to the device during a countdown.
When monitoring flammable gas in safety related applications the -PrimaX must be
calibrated with a known concentration of the gas being monitored.
The lower explosive limits (LEL) of the gases and vapors in the following example were taken from EN
60079-20-1. Local regulations may specify different LEL values; always ensure the correct values are used.
It is recommended that the PrimaX zero is calibrated using clean air, free of measuring gas, and calibration
gas of approximately 50 % of measuring range (comb. and TOX) in air of the gas being monitored. The
recommended calibration gas for oxygen is 50% of measuring range, but for a measuring range 0-25 vol%
O
2
, the device can be calibrated using 20.9vol% O
2
.
For calibration a test gas cylinder can be used.
The application time of dry calibration gas (< 15% rel. humidity) to the electrochemical
sensors shall not exceed 15 minutes.
For oxygen a zero calibration with gas is not required, it is performed internally.
Calibration example for Methanol
Methanol calibration gas concentration being used = 3,5 Vol%
Methanol volume concentration for 100%LEL = 6,0 Vol%
Methanol calibration gas concentration in %LEL
3,5 Vol% CH
4
O x
100% LEL
6,0 Vol% CH
4
O
= 58,3 % LEL
21 PrimaX GB
4 Operation
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