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GASMAX II Operation & Maintenance Manual, Revision 4.0 LOCAL GDS‐IR INFRARED SENSOR (CH 2) When the GASMAX II is configured to include a GDS‐IR Infrared Combustible or CO2 sensor, the IO/Power Supply board is factory modified to make Channel 2 compatible with the sensor’s 4‐20mA input signal. An integrated “zero set” pushbutton and magnetic zero switch is included inside the GASMAX II enclosure and is used to periodically set the zero point for the GDS‐IR. Zero‐set pushbutton located COM IO/Power Supply 420 IN 4‐20mA Input PWR PWR OUT 1 OUT 2 GND inside GASMAX enclosure 10‐0233‐420 Ribbon to Display TB2 TB1 I/O Power Supply with 4‐20mA In S1 Factory‐Supplied Wiring GDS‐IR Red Wire (+) to TB1 RED GDS‐IR Blue Wire (signal) to TB1 BLU GDS‐IR White Wire (zero) to TB1 WHT GDS‐IR Black Wire (‐) to TB1 BLK Figure 4-13: GASMAX with Local GDS-IR Page 26
