GT SERIES
1 INSTRUMENT, 7 APPLICATIONS
46
67112
Revision 10
Figure 66: Hydrophobic Filter Bulb Removal
6.3.3 Chemical Filter (optional accessory)
The Chemical Filter assembly (Part no. 67142) is available as an accessory. The filter contents can
be replaced with any of the following:
• Charcoal Granules (part no. 67148)
Charcoal removes higher hydrocarbons from the sample.
• Silica Gel (part no. 67205)
Silica Gel removes moisture from a sample.
The Gel will change colour from gold to green when saturated and replacement is
required.
• NOx absorber (part no. 67270)
The NOx absorber will remove Nitric Oxide (NO) and Nitrogen Dioxide (NO
2
) from a
sample.
The absorber will change colour from dark purple to brown when saturated and
replacement is required.
1. Remove and discard the dust filter, as detailed in
2. Remove the probe adaptor from the chemical filter assembly, as shown in
3. Unscrew the chemical filter assembly from the hydrophobic filter bulb, as illustrated in
Caution: The contents of this filter must only be replenished with
Teledyne GMI approved chemicals.
Note: When replacing the chemical filter, you must also replace the dust filter.