Model GP-01 Operator’s Manual
Description • 11
LCD
The LCD is visible through the front of the case. When the GP-01 is in
Measuring Mode, the target gas concentration, battery condition, and
alarm indications are displayed on the LCD. Various other items are
displayed when the LCD is in other modes, such as Calibration Mode.
When either of the two control buttons are pressed, the LCD backlight
comes on for 20 seconds.
Control Buttons
Below the LCD are two control buttons: POWER/MODE and AIR. The
POWER/MODE button turns the Model GP-01 on and off. The functions
performed by the control buttons are summarized in the following table:
Printed Circuit Boards
The primary function of the Model GP-01’s printed circuit boards is to
amplify the signal sent to them from the combustible gas sensor, convert
the signal to a meaningful measurement of gas concentration, display the
gas concentration on the LCD, store peak gas 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 various operating
modes of the unit.
Table 2: Model GP-01 Control Buttons
Button Function
POWER/MODE
• Turns the unit on and off.
• Turns the LCD back light on.
• Displays peak readings
• Resets the alarm circuit (gas alarms).
• Enters Calibration Mode with the AIR button.
• Enters Alarm Adjustment Mode with the AIR
button.
AIR
• Turns the LCD back light on.
• Adjusts LCD readings when the fresh air
adjustment is performed.
• Enters Calibration Mode with the POWER/MODE
button.
• Enters Alarm Adjustment Mode with the POWER/
MODE button.
• Increases settings when the unit is in Alarm
Adjustment Mode or Calibration Mode.
