MAMAC Systems HU-225-3-MA Humidity Transducer

The MAMAC Systems HU-225-3-MA is a professional-grade wall-mounted humidity transducer designed for integration into HVAC and building automation systems (BAS). This unit features a high-performance thermoset polymer capacitive sensor, providing 3% accuracy across the full 0–100% RH range. Engineered for field reliability, the HU-225-3-MA utilizes a 4-20mA 2-wire output, making it compatible with most standard controllers and data loggers. The device operates on a versatile power supply of 12-40 VDC or 24 VAC, allowing for flexible installation in various commercial and industrial environments. Its low-profile enclosure is optimized for space humidity monitoring in offices, hospitals, and mechanical rooms where maintaining precise environmental conditions is critical. With temperature compensation and multi-point calibration, this MAMAC relative humidity sensor ensures stable, long-term performance without the drift issues common in consumer-grade equipment.

• Enhanced Signal Integrity: The 4-20mA current loop output minimizes noise interference over long cable runs compared to voltage-based signals.
• Wide Power Compatibility: Supports 24VAC/VDC supply voltage, simplifying integration into existing 24V control circuits.
• Precise RH Monitoring: Delivers ±3% RH accuracy, critical for meeting tight specifications in LEED-certified buildings and lab environments.
• Field Durability: The rugged wall humidity transmitter housing protects sensitive electronics from dust and contaminants common in mechanical spaces.
• Fast Response Time: Optimized airflow through the vented cover ensures the sensor reacts quickly to changes in room load.

What is the proper wiring configuration for this transducer?
The HU-225-3-MA is a 2-wire 4-20mA transmitter. The supply voltage and the output signal share the same two wires, requiring a series connection with the load resistor and power source.

Can this sensor be used in high-temperature environments?
This model is designed for standard ambient room humidity applications. For high-temp duct or specialized industrial processes, a probe-style transducer from the HU-224 series may be more appropriate.

Is the sensor resistant to chemicals?
The capacitive sensing element is resistant to most common contaminants, but exposure to volatile organic compounds (VOCs) or corrosive gasses should be minimized to maintain 3% RH accuracy over time.

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.