Edwards D141-32-000, Instruction Manual

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D141-32-880 Issue A
Page 14 © Edwards Limited 2009. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
MAINTENANCE
5 MAINTENANCE
5.1 Replacing/fitting batteries
Refer to Figure 10 . Remove the battery cover using a finger nail or small screwdriver (A). Unclip the battery holder
from the clip (B). Remove the old batteries and replace with 4 new ones (C). Reconnect the battery holder to the
GasCheck G3 ensuring that the polarity is correct (D). The battery holder can then be placed back in the instrument.
Ensure that wires are not trapped when refitting the battery cover.
It is recommended that after battery replacement, the GasCheck G3 is programmed with the correct battery
selection (alkaline or nickel metal hydride) as described in
Section 4.4 . This ensures that the battery status indicator
can correctly identify the remaining capacity of the battery.
Figure 10 - Replacing batteries
5.2 Calibration
CAUTION
Calibration should only be attempted by qualified service engineers. Edwards offers a calibration facility for
GasCheck G3 instruments. Contact Edwards for more details.
The GasCheck G3 is supplied with two calibration settings, factory and custom. The Factory calibration setting cannot
be changed. The custom calibration allows the user to calibrate the GasCheck G3 at the local atmospheric pressure
which may offer an improvement over the factory calibration.
The custom calibration procedure varies depending on whether the unit has been set to concentrations (ppm or mg/
m3) or volumetric leak rates (cc/sec or g/yr).