14 • Chapter 2: Description GX-3R Operator’s Manual
CO Sensor Charcoal Filter (Black)
A black charcoal filter is placed into a recess in the filter gasket over the CO sensor. The
charcoal filter disk scrubs H
2
S and certain hydrocarbons 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.
H
2
S Sensor Humidity Filter (White)
A white humidity filter covers the H
2
S sensor. The filter absorbs humidity in the sampling
environment to prevent unstable readings around 0 ppm H
2
S. For users with a 1 ppm H
2
S
alarm setpoint, the filter should be replaced every 6 months, if you notice a drift on the zero
reading, or if the filter appears dirty (whichever is sooner). For users with a 2 ppm or higher
H
2
S setpoint, the filter does not necessarily need to be replaced.
Hydrophobic Dust Filter
The oval-shaped hydrophobic dust filter is attached to the top of the filter gasket, covering the
sensor ports and the filters. The filter gasket and hydrophobic dust filter get replaced as a set.
NOTE: Some GX-3Rs have a hydrophobic dust filter that is not attached to the filter gasket.
When replacing the hydrophobic dust filter on one of these GX-3Rs, remove the
filter and
the gasket and replace it with a filter gasket/hydrophobic dust filter
assembly.
Infrared Communications Port
An infrared (IR) communications port is located on the top of the case, near the top LEDs.
Logged data transmits through the port in standard IrDA protocol. A computer’s infrared port
or an IrDA/USB cable connected to a USB port can be used to download data to the GX-3R
Data Logger Management Program. See the GX-3R Data Logger Management Program
operator’s manual for data logging and downloading instructions.
Charging Socket and Battery Pack
A charging socket on the back of the instrument allows for charging cable connection.
A lithium ion (Li-ion) battery pack powers the GX-3R. At 25°C the battery lasts at least 25
hours. The battery icon in the upper right of the LCD shows remaining battery life.
A low battery warning activates when the GX-3R detects a low battery voltage. The GX-3R
sounds a dead battery alarm when battery voltage is too low for Measuring Mode.
The battery pack can be recharged by using the GX-3R charging cable. The battery pack is not
user-replaceable.
NOTE: Use of batteries or battery chargers not specified by RKI Instruments, Inc. will
compromise the CSA classification and may void the warranty. See “Recharging
the Batteries” on page 80.
WARNING: To prevent ignition of a hazardous atmosphere, batteries must only be
changed or charged in an area known to be nonhazardous.
AVERTISSEMENT:Pour éviter l’inflammation d’une atmosphère dangereuse, les batteries
doivent uniquement être modifiés ou facturés dans une zone connue
comme non dangereuse.
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