14 • Instrument Description GX-2003 Operator’s Manual
CO and H
2
S Sensors
The CO and H
2
S sensors are electrochemical cells that consist of two
precious metal electrodes in a dilute acid electrolyte. A gas permeable
membrane covers the sensor face and allows gas to diffuse into the
electrolyte. The gas reacts in the sensor and produces a current
proportional to the concentration of the target gas. The current is
amplified by the Model GX-2003’s circuitry, converted to a
measurement of gas concentration, and displayed on the LCD.
LCD
A digital LCD (liquid crystal display) is visible through a clear plastic
window on the front of the case. The LCD display simultaneously
shows the gas reading for all installed sensors. The display also shows
information for each of the GX-2003’s program modes.
Control Buttons
Five control buttons are located below the LCD. They are arranged in
a circular pattern around a central button, the POWER ENTER button.
The DISPLAY (ADJ) button is on the left, the RESET SILENCE button
on the right, the ▲AIR button on the top, and the (SHIFT)▼ is on the
bottom.
Printed Circuit Boards
The GX-2003 printed circuit boards analyze, record, control, store, and
display the information collected. The circuit boards are located inside
the case. They are not user serviceable.
Table 2: GX-2003 Control Button Functions
Button Function(s)
POWER ENTER • turns the GX-2003 on and off.
• used during setup and calibration.
RESET SILENCE silences and resets audible alarm if the GX-2003 is programmed
for latching alarms and the alarm silence option is on
1
DISPLAY (ADJ) • activates Display Mode
• enters instructions into the GX-2003’s microprocessor
▲AIR • activates the demand-zero function (automatically adjusts the
GX-2003 in fresh-air conditions)
• scrolls through the display and settings modes
(SHIFT)▼ • scrolls through the display and settings modes
• enters instructions into the GX-2003’s microprocessor
1 The GX-2003’s alarms are user-adjustable. See “Chapter 6: Setup Mode” on page 58.
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