24 • Chapter 3: Operation GX-3R Operator’s Manual
Measuring Mode Operation
When the GX-3R completes its startup sequence, it is in Measuring Mode. In Measuring
Mode the GX-3R continuously monitors the sampled atmosphere and displays the target gas
concentrations. The GX-3R is considered to be in Normal Operation if there are no alarm
indications.
Heart Symbol: The heart symbol in the upper left corner of the LCD indicates the operation
status and blinks when normal. A microprocessor error causes the heart symbol to stop
flashing or to disappear.
Check Mark
: If BUMP.RMDR is set to ON and if a bump test is not due, a check mark
appears in the upper left corner of the LCD.
“S”
: If the instrument is operating in Stealth Mode, an “S” appears at the top of the LCD.
Backlight: In a low-light environment, press and release either button to turn on the display
backlight. See pg.74 to program backlight duration.
Confirmation/Non-Compliance Indicator: If the BEEP menu item in User Mode is set to
anything other than OFF, the GX-3R gives periodic indications to confirm that it’s operating
or to indicate a non-compliance (pg.72).
Monitoring an Area
1 . Start up the GX-3R as described above in “Start Up” on page 18. It is now in Measuring
Mode.
2 . Take the GX-3R to the monitoring area.
3 . Wait at least 15 seconds and observe the display for gas readings. If a reading is
observed, allow the reading to stabilize to determine the gas concentrations present.
4 . If a gas alarm occurs, take appropriate action. See pg.29.
5 . Do not expose the GX-3R to rain.
6 . The GX-3R’s IP 66/68 ratings do not imply that the GX-3R will detect gas during and
after exposure to those conditions. If exposure occurs, dry the instrument with a cloth
and perform a bump test as described on pg.46.
7 . If the GX-3R gets exposed to flammable liquids:
a. Wipe the instrument off with a cloth dampened with water.
b. Replace the filters as described on pg.82 and pg.84 if they became saturated
c. Perform a bump test as described on pg.46.
S 7:49
0 0.0
CO ppm H2S ppm
0 20.9
CH4 LEL O2 %
7:49
0 0.0
CO ppm H2S ppm
0 20.9
CH4 %LEL O2 %
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