Model GP-01 Operator’s Manual
Maintenance • 31
3. Rotate the membrane retainer about one-quarter turn counterclockwise
to remove it from the sensor retainer (the top of the unit).
4. Carefully remove the old filter or filters from the recess in the senor
retainer.
NOTE: Install the new sensor filter or filters into the recess. If H
2
S
scrubber filters are used, put them in first. Make sure they are
properly seated in the recess. Then insert one sensor cover in the
recess over the two H
2
S scrubber disks.The H2S scrubber filters
are shown for reference in case they are installed. They are not
installed as shipped from the factory. See “Combustible Gas
Detection” on page 15 for a discussion of when they should be
installed.
CAUTION: If the H
2
S scrubber disks are installed, be very careful not to
push them too far into the recess in the sensor retainer. Lay
the disks carefully in the opening on top of the small tabs in the
recess.
5. Reinstall the membrane retainer.
H2S Scrubber Disks
Sensor Cover
POWER
MODE
AIR
GP-01
%LEL
Figure 12: Replacing the Sensor Filters
