Model GX-2001 Operator’s Manual
Description • 8
Printed Circuit Boards
The primary function of the Model GX-2001’s three printed circuit boards
are to amplify the current sent to them from the four gas sensors, convert
the current to a meaningful measurement of gas concentration, display the
gas concentration on the LCD, store peak, STEL, and TWA readings, and
activate the alarm circuit if an alarm point has been reached. They monitor
battery level, battery failure, and sensor failure. They also control the
Model GX-2001’s time function and the various operating modes of the
unit.
NOTE: The printed circuit boards contain no user serviceable parts.
Alarm Lights
The Model GX-2001 has two alarm lights located on top of the unit. The
alarm lights are two red LEDs that alert you to gas, low battery, and sensor
failure alarms.
DISP
• Turns the LCD back light on.
• Displays the next target gas when the unit is in
Measuring Mode.
• Enters Time Adjustment Mode with the MODE/
POWER button.
• Decreases settings when the unit is in Alarm
Adjustment Mode or Time Adjustment Mode.
• Toggles between field calibration and auto
calibration when the unit is in Calibration Mode.
AIR
• Turns the LCD back light on.
• Adjusts LCD readings when the a Demand Zero is
performed.
• Enters Calibration Mode with the MODE/POWER
button.
• Enters Alarm Adjustment Mode with the MODE/
POWER button.
• Increases settings when the unit is in Alarm
Adjustment Mode or Time Adjustment Mode.
• Toggles between field calibration and auto
calibration when the unit is in Calibration Mode.
Table 2: The Control Buttons of the Model GX-2001
Button Function
