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The General Monitors Model IR7000 Infrared Point Detector is a microprocessor-based Carbon Dioxide gas detector that continuously monitors CO2 in ppm levels. The IR7000 detection principle is based on measuring the absorption of infrared radiation passing through a volume of gas using a dual beam with a single detector. The IR detector measures the intensity of two specific wavelengths, one at an absorption wavelength and another outside of the absorption wavelengh. The gas concentration is determined by a comparison of these two values. All of the IR7000's electronics are contained within an explosion-proof housing allowing detector information to be processed at the point of detection. The IR7000 provides a 4-20mA signal proportional to 0-100% full scale. Another feature of the IR7000 is its RS-485 communications output for linking up to 128 Model IR7000's in series or up to 247 units with repeaters. The RS-485 output provides status, alarm, fault and other information for operation, including troubleshooting, or programming the detector. The IR7000 Infrared Point Detector is available in either an aluminum or stainless steel housing and is designed for use in Class I, Div. 1, Groups B, C & D and Zone 1 areas. The housing is IP66/Type 4X rated.