Model GX-2001 Operator’s Manual
Start Up • 10
Start Up
This section explains how to start up the Model GX-2001 and to get it ready
for operation.
Start-up Procedure
1. Press and hold the MODE/POWER button for one second to turn on the
Model GX-2001 and to activate its LCD. The alarm lights flash, the
buzzer sounds, and the vibrator vibrates.
2. The Model GX-2001 tests all elements of the LCD, then displays the
year, month, day, and time before displaying the battery voltage. The
buzzer sounds again after the battery voltage is displayed.
CAUTION: If the battery level is low or if the battery icon is flashing and
the unit’s buzzer sounds, recharge the Model GX-2001’s
battery.
3. The four gas sensors inside the Model GX-2001 begin working, and the
concentrations of the target gases are displayed on the LCD in the
following order: O
2
, H
2
S, CO, and HC. The Model GX-2001 is now in
Measuring Mode. Oxygen is displayed as a percentage (%), H
2
S and
CO as parts per million (ppm), and HC (combustible gases) as a
percentage of the lower explosive limit (% LEL).
NOTE: You can test the oxygen sensor and alarm circuit by exhaling into
the oxygen sensor. When the LCD reading falls below the alarm
point for oxygen, the buzzer will sound, the vibrator will activate,
the LCD reading for oxygen will flash, and the alarm lights will turn
on.