ACI A RH2-AN-O Type III Fire Alarm

The ACI A/RH2-AN-O outdoor relative humidity transmitter delivers precise humidity readings from outdoor air, using a 10 kΩ Type III thermistor housed in a rugged Euro enclosure designed for outdoor or sheltered outdoor mounting. It provides flexible output options for building automation systems: a default 4-20 mA humidity signal, with selectable 0-5 VDC or 0-10 VDC analog outputs, enabling straightforward integration with diverse controllers and data loggers. With a stated accuracy of ±2% RH, the unit is suitable for HVAC control, energy management, and environmental monitoring where reliable outdoor humidity data improves control strategies and overall system performance. As part of the A/RH2 family, this sensor combines outdoor RH sensing, the 10 kΩ Type III thermistor, and Euro enclosure construction to support outdoor RH measurements feeding into building management systems.