17 • Operation
Model GX-2001 Operator’s Manual
Multiple Alarms
If more than one gas alarm is activated, the LCD shows the concentration
of the gas that triggered the last alarm. To see the concentration of the
other gasses, press the DISP button until the gas of interest is displayed.
When the DISP button is pressed, the displayed gas will stay displayed for
20 seconds, then the display will cycle.
For example, if concentrations of both CO and H
2
S in the monitoring
environment were to rise above their respective alarm points and CO was
the first to do so, the concentration of H
2
S would display on the LCD since
it was the most recent alarm event. Pressing the DISP button would display
the concentration of CO for 20 seconds, then HC for three seconds, etc.
If the TWA and STEL alarms are triggered, alarm indications for both
gasses occur at the same time. The LCD would then display both “TWA”
and “STEL” next to the time and both “TWA” and “STEL” would be blinking.
Resetting Alarms
To reset an alarm, press the MODE/POWER button after the gas reading
falls below the Alarm 1 point (or above for oxygen). If a TWA alarm has
been activated, it cannot be reset unless you turn off the unit.
NOTE: Even though gas concentrations may have returned to normal or
have fallen below the alarm point, the alarm indications will
continue until you have reset the alarm using the MODE/POWER
button.
Sensor Failure
• Name of gas
sensor displayed.
• Gas reading
replaced by FAIL.
Double Pulsing Tone
(two pulses in quick
succession)
Table 4: Alarm Types and Indications
Alarm Type
LCD Indications
Other Indications
