Infrared Carbon dioxide Modbus® gas detector with a 0 - 2,000 ppm measurement range housed in a water tight, duct style enclosure for mounting in ventilation ducts. Key Features Single internal infrared CO2 sensor 0 - 2,000 ppm standard range Long sensor life (approx. 15 years) Measures ambient air temperature LCD digital display One dry contact relay For duct mount ventilation applications Industrial IP54 rated enclosure Low maintenance, easy calibration 4 - 20 mA or 0 - 10 VDC linear output signal Modbus® RS-485 RTU output Operating power 24 VDC or 24 VAC nominal CE certified Description The AST-IS12 industrial transmitter contain a non-dispersive, infrared sensor for accurate and reliable carbon dioxide (CO2) detection in duct mount applications. The enclosure is IP54 rated and it includes a display, relay and Modbus® output. It is low maintenance and a key component for climate control of buildings and different ventilation strategies. It is designed to communicate with a BAS or Controller. It requires 24 VDC / VAC nominal voltage power, has 4 - 20 mA or 0 - 10 VDC linear output signals and offers a standard 0 - 2,000 ppm gas monitoring range.