Pump, Flow chamber – RKI Instruments GX-2003 Manual User Manual
Page 17
GX-2003 Operator’s Manual
Instrument Description • 10
its optional battery charging station or by placing the battery pack in
the charging station.
NOTE:
Use of batteries or battery chargers not specified by RKI
Instruments, Inc. will void the CSA classification and may
void the warranty. See “Replacing or Recharging the
Batteries” on page 70.
WARNING: To prevent ignition of a hazardous atmosphere, batteries
must only be changed or charged in an area known to be
nonhazardous.
Pump
A diaphragm pump inside the GX-2003 draws the sample to the
sensors. It can draw sample from as far as 40 feet from the GX-2003.
The pump is not user serviceable.
CAUTION:
Sample hose lengths of more than 40 feet are not recommended
for the GX-2003 because of flow rate reduction.
Flow Chamber
The flow chamber is on the back of the GX-2003 and is held in place by
three phillips screws. The flow chamber seals on the face of the
sensors inside the GX-2003 and routes flow from the pump to the
sensors to the exhaust port (also a part of the flow chamber). The flow
chamber includes filter ports for the HC filter and the CO filter.
HC Filter
The HC filter is located in the flow chamber directly over the % LEL
sensor. It is a yellow and black plastic ring which contains two H
2
S
removal filter disks and a thin white plastic sheet with a hole in the
middle on each side to support the H
2
S removal filter disks. The
yellow side of the HC filter snaps into a threaded plastic filter retainer
which screws into the flow chamber over the % LEL sensor.
The H
2
S removal filter disks are white when new. They scrub H
2
S out
of the gas sampled to increase the life of the combustible sensor. They
darken as they absorb H
2
S and the HC filter must be changed when
the filter disks turn a dark brown color. The recommended
replacement frequency will depend on how often the unit is exposed
to H
2
S and the concentration. Check the condition of the H
2
S removal
filter disks through the holes in the white plastic support sheets
quarterly.