GX-6000 Operator’s Manual
Appendix C: Using the GX-6000 in Leak Check Mode • 167
6 . The GX-6000 is now monitoring for gas in Leak Check Mode. The pump is on and
one of the following screens appears depending on the setting of the
CO DISPLAY
parameter in Maintenance Mode.
NOTE:
For maximum sensor stability, allow 3-5 minutes for the sensor to warm up.
The small increment size in the lower range of a ppm measurement can cause
instability if the unit is not properly warmed up.
7 . If you wish to change operating modes by returning to the Mode Select Screen, press
and hold the
▲
AIR
and DISP/LOCK buttons for 5 seconds.
Performing a Demand Zero, Leak Check Mode
Before using the GX-6000, it is recommended to set the fresh air reading for the target gas
by performing a demand zero. This will set the CH
4
channel to zero.
1 . Find a fresh-air environment. This is an environment free of toxic or combustible
gases and of normal oxygen content (20.9%).
2 . Turn on the unit as described above in “Turning On the GX-6000, Leak Check
Mode”.
3 . Press and hold the
▲
AIR button. The display prompts you to hold the
▲
AIR button.
4 . Continue to hold the
▲
AIR button until the display prompts you to release it. The
GX-6000 will set the fresh air reading for the CH
4
channel. Start up is complete and
the unit is now ready for monitoring.
Leak Testing
In Leak Check Mode, the GX-6000 only displays combustible gas readings. The
increment of the reading is always 100 ppm but the display range can be adjusted by using
the DISP/LOCK button. The display range choices are 500 ppm, 1000 ppm, 2000 ppm,
and 5000 ppm. The readings are displayed in both numerical and bar graph form. As the
gas concentration increases from 0 ppm, the alarm LEDs begin to blink in unison with the
buzzer’s pulsing. The blinking/pulsing rate increases as the gas reading increases.
In a low-light environment, press and release any of the buttons to turn on the display
backlight. If
CONFIRMATION
is set to
ON
in the Maintenance Mode menu, the GX-
6000 beeps once every user-defined interval to confirm that it’s operating.
4:07
CH4
F . S .
0
ppm
5000
ppm
4:07
CH4
F . S .
0
ppm
5000
ppm
CO
ppm
0
CO DISPLAY
set to
OFF CO DISPLAY
set to
ON