26 • Chapter 3: Operation GX-3R Operator’s Manual
Overscale Protection
The GX-3R protects the combustible gas sensor by temporarily turning off the sensor power if
levels exceeding 100% LEL are detected. Nevertheless, combustible gas concentrations above
100% LEL can still affect the zero level or calibration of the combustible gas sensor.
CAUTION: Do not expose the combustible gas sensor to high concentrations of
combustible gas such as that from a butane lighter. Exposure to high
concentrations of combustible gas may adversely affect the performance of the
sensor.
CAUTION: Any rapid increase in the combustible gas reading on the combustible gas
channel followed by a declining or erratic reading may indicate a gas
concentration above the LEL which may be hazardous.
Damaging Gases
Some gases such as silicone vapors, chlorinated hydrocarbons, and sulphur compounds can
contaminate the sensor’s detection elements. This causes sensor damage and/or a reduced
response to combustible gas. Make every effort to avoid these gases.
The H
2
S scrubber disks protect the combustible sensor from H
2
S, but you should avoid other
sulphur compounds.
Oxygen-Enriched Atmospheres
The GX-3R Pro is not intended for use in oxygen-enriched atmospheres.
WARNING: Do not use the GX-3R Pro in an environment whose oxygen concentration
is above 21% .
H
2
-Compensated CO Detection
• GX-3R displays CO readings.
•H
2
reading is not displayed but “H2 RICH” appears once H
2
concentration rises above
2000 ppm.
Interference Information
Some gases interfere with CO and H
2
S sensors. For a complete list of these gases, see pg.112.
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