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The Model MC600 is a microprocessor-based multichannel controller that provides six channels of continuous gas detection. It is compatible with General Monitors' hydrocarbon sensors, H2S sensors, all versions of our combustible & H2S intelligent/smart sensors, IR2100, IR5000, IR7000, TS4000, TS400 and TS420. It provides a front panel user interface including six independent LCD channel displays and keypad for setup, calibration and gas reading functions as well as ready, alarm & fault indicators. The MC600 also provides dual-RS485 serial communication utilizing MODBUS protocol. The MC600's modular design allows for a variety of configuration options. It provides local alarm indication as well as common/discrete relay contacts. The design incorporates the use of a custom display to provide channel status and a user setup interface. The MC600 provides six user configurable auxiliary relays. The relays can be configured to activate on any of the six channel's alarm high, alarm low or warn set points for use with external devices such as a horn and/or beacon. These relays have the following independent user configurable options: common warn or alarm activation set point, discrete channel alarm activation set point, energized/de-energized, latching/non-latching and an adjustable timer from 1-120 minutes. The units' front panel has six individual backlit LCD channel displays and warn and alarm daylight readable LED indicators. The MC600 provides one common fault relay, which activates upon any system or individual channel malfunction. This relay has two user selectable options, activated/de-activated during setup or cal mode operation. The MC600 provides a user selectable zoning and voting feature as well. The system is capable of providing up to three zones of which single or dual voting may be selected.