RKI Instruments GX-2001 Manual - Manual (Page 20)

15 • Operation Model GX-2001 Operator’s Manual
• The GX-2001 provides the combustible sensor with some protection
against exposure to high levels of combustible gas. It does this by
turning off the combustible sensor power temporarily when it
determines that an over scale (more than 100% LEL) concentration of
combustible gas is present that may damage the sensor. Nevertheless,
concentrations of combustible gas of more than 100% LEL can still
affect the zero level or calibration of the combustible sensor if the
concentration is high enough.
CAUTION: Do not expose the combustible 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 perform of the sensor.
Alarms
This section covers alarm indications, including multiple alarms and trouble
alarms. It also tells you how to reset the Model GX-2001 after an alarm has
occurred and how to respond to an alarm condition.
NOTE: False alarms may be caused by radio frequency (RF) or
electromagnetic (EMI) interference. Keep the GX-2001 away from
RF and EMI sources such as radio transmitters or large motors.
Alarm Indications
The Model GX-2001 will sound an alarm and the unit will vibrate when one
of the target gas concentrations rises above the first alarm point, or in the
case of oxygen, falls below the low point alarm setting for that gas.
The Model GX-2001 also sounds an alarm and vibrates when the second
alarm point is reached for HC, CO, and H
2
S, when the concentration of
oxygen rises above 23.5% in the monitoring area, and when the STEL and
TWA alarm points are reached for CO and H
2
S.
When a trouble condition occurs, such as a sensor failure or low battery
charge, the unit will also sound an alarm but it will not vibrate.