8 • Operation
Model GX-82 Instruction Manual
Safety Self-Check
The GX-82 continuously monitors itself for proper operation. If a malfunction occurs, a
single steady “trouble” tone sounds, and one of the following messages display.
Emergency Operation
The GX-82 can operate temporarily with up to three failed sensors. If a sensor(s) fails or is
absent at start-up, the GX-82 sounds a seven-tone alert, displays
FAIL COMB O2 CO
or
H2S
(any combination of two) then adjusts to operate on the remaining sensor(s). The GX-82
displays
XX
for the defective sensor(s) and normal readings for the active sensors. The
GX-82 performs normal monitoring functions for the active sensors for 13 minutes, when
it performs a self-diagnosis, then shows a malfunction alarm. To continue using the
GX-82, turn off the power and restart.
If a sensor fails during operation, the GX-82 shows a malfunction alarm. To continue
monitoring with the remaining active sensors, turn off the power and restart as described
above.
Table 4: GX-82 Error Messages
Display
Description
FAIL (COMB)
Indicates sensor failure (the failed sensor is
displayed).
00 OVER 00.0
Indicates O
2
concentration in excess of 40.0% or
an O
2
sensor failure.
WARNING: High oxygen concentration
increases the risk of fire hazard.
LOW BATT
Indicates the battery voltage is too low to run the
GX-82. See “Displaying battery voltage” on
page 6.
