The tasks described in this chapter are reserved for authorised
trained personnel only, since these tasks are liable to affect
detection reliability
This procedure describes:
zero adjustment;
Sensitivity adjustment.
Necessary equipment
Multimeter (ranges 0-30 mA and 0-2 V), intrinsically safe if necessary.
Cylinder of pure air.
Cylinder of calibration gas, of suitable concentration for the measurement
range (between 30 and 70% of the measurement range).
Commissioning
Prior checks
Check the following points:
Detector housing grounded.
Connexion of the shielding of the cable and the ground to the controller
Integrity of the mechanical mounting (fixings, cable gland, and cover) ensured.
Powering up detector
1. Inhibit any installation alarms to avoid unexpected triggering during the
operation.
2. Connect power to the detector line in accordance with the manufacturer's
instructions.
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