Automation Components Inc (ACI) A/RH2-R Transmitter

The Automation Components Inc (ACI) A/RH2-R Transmitter is a relative humidity room transmitter engineered for precision in Building Automation Systems (BAS) and demanding HVAC environments. This unit utilizes a capacitive sensing element with a factory-fitted hydrophobic filter, ensuring high-performance monitoring in spaces sensitive to dust, oils, and environmental chemicals. Designed for versatile field integration, the A/RH2-R features field-selectable output signals—including 4-20 mA, 0-5 VDC, and 0-10 VDC—reachable via on-board DIP switches. Its ±2% RH accuracy at 77°F (25°C) from 10% to 95% makes it a standard for humidity control in pharmaceutical facilities, hospitals, and clean rooms. The low-profile room housing supports both AC or DC power sources (15-40 VDC or 18-28 VAC), providing the electrical flexibility required for retrofitting or new HVACR installations. Technicians can execute single-point field calibration via increment and decrement switches, maintaining long-term sensor stability without total unit replacement.

• Selectable Analog Outputs: On-board DIP switches allow for seamless switching between 4-20 mA, 0-5 VDC, and 0-10 VDC signals to match controller requirements.
• Durable Sensing Element: The thermoset polymer capacitive humidity sensor is protected by a hydrophobic filter, reducing drift in contaminated or moist environments.
• Ease of Calibration: Integrated push-button DIP switches enable 0.5% incremental adjustments for efficient field-level verification and tuning.
• Universal Compatibility: Wide supply voltage range (15-40 VDC/18-28 VAC) ensures compatibility with most standard building controllers.
• Optimized Airflow: The Delta-style room enclosure is designed with four-way ventilation to minimize self-heating and ensure accurate ambient humidity readings.

Can I change the output signal after installation?
Yes. The A/RH2-R features internal DIP switches that allow the technician to toggle between voltage and current outputs in the field without requiring specialized software.

Does this unit require a specific power polarity?
The transmitter is reverse polarity protected and supports both AC and DC power, though proper wiring to the BAS controller is required to ensure signal integrity for 3-wire voltage configurations.

Is this sensor suitable for high-purity environments?
With its ±2% accuracy and moisture-resistant capacitive element, this ACI room humidity sensor is commonly specified for clean rooms, laboratories, and museums where strict atmospheric boundaries are required.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.