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ACI’s A/RH Duct Series Sensor is a Relative Humidity Transmitter designed for use with electronic controllers in commercial HVAC building management systems. The RH Duct Transmitter can be powered with either AC or DC supply voltage and is field selectable with a 4-20 mA, 0-5 VDC, or 0-10 VDC output signal that is equivalent to 0 to 100% RH.Calibration Although ACI sensors are designed and engineered to drift less than other competitive humidity sensors on the market, over time, factors like env …