Revision 1.1
GM ECx Instruction Manual
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3.7.1 “Sensor Type” and GM ECX Signal Conditioning
Electrochemical sensors are available for detection of many different gas compounds and ranges.
The GM ECx must be configured for each type’s different response coefficients, signal strength
and gain and offset requirements. The block / wiring diagram in Figure 3-7 illustrates how the GM
ECx is able to accept many sensor types without the need of manual potentiometers or jumpers.
Smart Sensors carry this setup information with each sensor.
Figure 3-7: GM ECX Block / Wiring Diagram
SECTION 4 – INITIAL START-UP
4.1 “Transmitter
Configuration”
Menu
Figure 4-1shows the GM ECX XMITTER CONFIG menu used to activate channels, precisely
calibrate 4-20mA outputs and set time / date. Its menus are set at the factory and typically not
needed by the user. To access from any data display, press and hold the NEXT key for 5-
seconds until the screen appears requesting a special key sequence (4-UP keystrokes).
Figure 4-1: Transmitter Configuration Menu
4.2
Initial Toxic / Oxygen Monitor Start-Up
GM ECX Toxic / Oxygen Monitors, factory equipped with a local Simple or Smart electrochemical
sensor, rarely require adjustments (other than routine calibrations) to provide accurate readings.
However, after installation the following checks should be performed to insure proper operation.