GMI GT series - Chemical Filter (Accessory)

13-5
OPERATOR MAINTENANCEUSER HANDBOOK
13.2.3 Chemical Filter (Accessory)
The Chemical Filter assembly (Part No.67142) is available as an
accessory and the lter contents can be replaced with either of the
following:
(a) Colour indicated water absorbent silica gel.
The silica gel, supplied in a bottle, (Part No. 67205), provides
the user with a simple visual indication of lter gel saturation
by changing colour from gold to green when gel replacement
is required.
or
(b) NOx absorber, for absorbing Nitric Oxide (NO) and Nitrogen
Dioxide (NO
2
) from the sample.
The absorber, supplied in a bottle, (Part No. 67270), provides
the user with a simple visual indication of lter absorbent
saturation by changing colour from dark purple to brown
when absorber replacement is required.
The lter contents replacement procedure is the same, regardless
of chemical type.
CAUTION: The contents of this filter must only be
replenished with GMI approved chemicals.
Note: When replacing the chemical lter, it is essential to also
replace the dust lter.
1) Remove then discard the dust lter, as detailed in section
13.2.1 paragraphs 1 and 2.
2) Unscrew the probe adaptor in a counter clockwise direction,
then remove the adaptor from the chemical lter assembly
as shown in Fig. 13.3.