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The General Monitors Model 2602A is a single-channel Hydrogen Sulfide Gas Control Module that has been designed for use with General Monitors' H2S Gas Sensors. It is designed to monitor H2S in parts per million (ppm) levels and provide status indication and alarm outputs. Microprocessor-based electronics allow all options to be user selectable through front panel interface (mode/select switch and digital display). The digital display on the 2602A indicates gas concentration, fault codes, calibration cues and setup options. Other features of the 2602A are LED indications of status, as well as both open collector and relay outputs for fault, low alarm and high alarm. Each module has RS-485 serial communications which provides an interface with a General Monitors Model CC02A MODBUS communications module. Fault and alarm status, as well as setup options, can be configured via the CC02A module. The 2602A is part of the General Monitors Zero Two Series Gas and Fire Detection System which is a flexible solution for various combustible, toxic gas and fire detection applications. All of the Zero Two Series system cards are completely compatible and can be intermixed within the same rack if required. The Zero Two Series Rack includes options of 4, 8 or 16 channels and provides a bus of common terminals to each channel.