ACI 122837 Outside Air Relative Humidity Sensor with 10K Thermistor

The ACI 122837 (A/RH3-AN-O) is a high-precision outside air relative humidity sensor designed for HVAC building automation systems. This professional-grade transmitter utilizes a thermoset polymer capacitive sensing element with a factory-applied hygroscopic filter to deliver reliable proportional analog output signals in outdoor environments.

Key Features:

• ±3% accuracy for precise humidity monitoring
• Multiple output options: 0-5 VDC, 0-10 VDC, and 4-20mA (default) - field selectable via onboard DIP switches
• Integrated 10,000 Ohm Type III thermistor for temperature sensing
• Hygroscopic filter provides enhanced resistance to moisture, dust, and chemicals for long-term reliability
• Built-in test options (0%, 50%, 100%) to verify proper operation and wiring
• Field calibration capability using increment/decrement DIP switches without sensor replacement
• Euro-style weatherproof enclosure suitable for outdoor installations

The onboard DIP switches allow technicians to easily configure output signals and supply voltage to match specific application requirements. This sensor is ideal for monitoring outdoor air conditions in commercial and industrial HVAC systems, energy management applications, and building automation projects requiring accurate relative humidity measurement.