Atest Gaz ProGas 4, User Manual

Page: 22 / 48

www.atestgaz.pl
Figure 11: Design of the gas sensing head
5.6.3.3 Sensor replacement {5}
During operation there is a natural loss of metrological parameters of the sensors. Compensation of this
phenomenon occurs through periodic, systematic adjustment of the display (see Section 5.6.2.2) – until the
moment when it is necessary to exchange the sensor. It is assumed that the exchange should be carried out
after the loss of sensitivity below 50% of the initial sensitivity.
Sensor replacement must be always combined with subsequent calibration of the detector.
To assembly and disassembly the sensor, it is necessary to:
loosen the locking screws in the bushing with 1.5 mm Allen wrench (see Figure 3),
unscrew the sensor housing (do not allow bushing to rotate due to the possibility of damage to
the connector inside the enclosure),
remove the filling stuff (unscrew the bolts in the case of the HW head),
take out the old sensor (or a sensor module) from the head (unscrew the bolts in the case of the
HW head) and replace it with a new one, make sure that the new sensor is positioned correctly,
insert (and screw if necessary) the filling stuff,
follow instruction in section 5.6.3.1,
carry out calibration of the detector.
Not all errors resulting from improper assembly are detected by the diagnostics system of
the detector. Each disassembly and assembly of the measurement head must be verified by
supplying gas and checking the detector’s reaction to gas.
s. 22|27
User Manual: POD-064-ENG R05
Cover with the sinter
Protective cover
Securing bolt
Ring
Membrane