Impact / Impact Pro / Impact Pro IR Operating Instructions
54
8� Routine Servicing
Apart from the maintenance described in Section 7 Routine Maintenance the
servicing requirements are limited to:
Calibration•
Changing of the cartridge when required or indicated by the instrument•
Replacing sensors in serviceable cartridges (i.e. non-OFCH combinations •
where supported by the instrument)
8�1 Serviceable Cartridges
Instruments that support serviceable cartridges can have the individual sensors
replaced, instead of replacing the whole cartridge.
The procedure is as follows:
Switch the instrument off and remove the cover grille.1.
Unscrew the central cartridge screw and remove the cartridge.2.
On the underneath undo the two screws (1).3.
Lever out the PCB from the locating tabs (2), on the two sides adjacent 4.
to the screws. Retain the sensor retainer (3) if fitted.
Pull out the PCB.5.
For all sensors except the oxygen, replacing the sensor requires the 6.
user to unplug the existing sensor and locate the new sensor in the
same position.
For the oxygen sensor the two screws (4) must be undone. The tabs of 7.
the replacement sensor must be securely screwed to headers. Ensure
each sensor tab is secured to the correct header.
Replace the PCB in the housing, until it clicks into place.8.
Replace the two screws (1), ensuring the retainer is fitted (3) and insert 9.
the cartridge into the instrument.
Check the cover grille filter and if necessary replace it. 10.
Replace the cover grille and wait at least 20 minutes. Then switch the 11.
instrument on.
The instrument must be calibrated before use.12.
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