RKI Instruments GX-6000 User Manual

11 • Instrument Description GX-6000 Operator’s Manual
top left corner of the sensor block.
The standard calibration for a PID channel is to isobutylene. A PID channel
can be factory setup for and calibrated to other gases. Regardless of the
calibration gas, the PID channel will still detect and respond to a variety of
volatile organic compounds (VOCs). Consult RKI Instruments, Inc. for other
available PID configurations and to specify the desired PID configuration
when a unit is ordered.
Dummy Sensors
Any unit that has less than 6 sensors will have a dummy sensor installed in
one or more unused sensor positions. Dummy sensors are factory installed.
The flat top of the dummy sensor should face up and the bottom hollow side
should face down.
Filters
An H
2
S removal filter disk is placed into a recess in the sensor gasket over
the %LEL sensor. It prevents H
2
S in the ambient air from reaching the unit’s
combustible gas sensor. Removing H
2
S that is present in the monitored air
prolongs the life of the sensor. The H
2
S filter disk is dark red in color and
although it may darken over time, its color is not indicative of remaining
filter life. The H
2
S filter disk can absorb H
2
S for 33 ppm hours and should be
replaced after that much exposure. With this many ppm hours of absorption,
the H
2
S filter disk should be replaced after 80 minutes of exposure to 25 ppm
H
2
S. This equates to replacing the H
2
S filter disk after 40 2-minute
calibrations with a cylinder containing 25 ppm H
2
S. If H
2
S exists in the
monitoring environment, the H
2
S filter disk will have to be replaced more
frequently.
A charcoal filter is placed into a recess in the sensor gasket over the CO
sensor. The charcoal filter is black, has a woven texture, and is impregnated
with an H
2
S absorbing material. The CO sensor will respond if exposed to
H
2
S and certain hydrocarbon gases. The charcoal filter disk scrubs these
gases out of the sample to avoid false CO readings. If false or elevated CO
readings are noticed, especially in the presence of H
2
S, change the charcoal
filter.
Inlet Filter Holder
The filter holder is a clear plastic dome shaped piece on the top of the case. A
male quick connect fitting is located on the inlet filter holder. This is the
GX-6000’s inlet fitting. The filter holder may be removed by turning it
counterclockwise and pulling it away from the case. One flat membrane disk
hydrophobic filter, a wire mesh disk, and a rubber filter retaining gasket are

RKI Instruments GX-6000 Specifications

General

Brand	RKI Instruments
Model	GX-6000
Category	Measuring Instruments
Language	English