G F M 4 0 0 S E R I E S U S E R M A N U A L
To change the batteries, remove the two screws on
the rear of the instrument, then lift the battery
cover and remove the battery pack from the recess.
Place the new battery pack in the recess, making
sure that the polarity is correct, replace the battery
cover and secure with the two screws.
Always replace the battery pack in dry, clean
conditions, preferably indoors.
NEVER allow dust or moisture to enter the
battery compartment
.
NEVER attempt to replace batteries in a
potentially explosive atmosphere.
If you replace the batteries in the field, you can, of course, recharge them later
when you return to base.
Changing the gas filter
There is a gas filter built into the input of the instrument. Check this filter weekly
and change it when it becomes clogged or dirty. Always use the correct filter of the
recommended type, which can be supplied by Gas Data Limited. If you use a non-
recommended filter, this will invalidate the warranty on the instrument.
To replace the filter,
first remove the four
screws around the
base of the Sample In
port. Lift the top off
the port and remove
the old filter.
Insert a new filter,
making sure to
orientate it correctly,
replace the top of the
port and secure with
the four screws.
18 GFM400 Series User Manual
WARNING:
NEVER use the
GFM400 without
the correct filter
.
GFM400 Series
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