MAMAC Systems HU-225-2-MA Humidity Transducer

The MAMAC Systems HU-225-2-MA is a high-performance wall humidity transducer engineered for precise monitoring in demanding HVAC and Building Automation Systems (BAS). Featuring a cross-linked bulk polymer capacitive sensing element, this unit delivers a reliable 4-20mA 2-wire output with 2% RH accuracy across the full 0-100% range. Built to withstand challenging environments, the sensing element is shielded by a proprietary hydrophobic ePTFE filter, protecting it from condensation, salt air, and airborne pollutants that typically degrade sensor performance.

Designed for easy field integration, the HU-225-2-MA supports a wide 12-40Vdc supply voltage and includes an unpluggable terminal block for simplified wiring. The aesthetically appealing ABS enclosure is optimized with top and bottom louvers to ensure maximum airflow for an ultra-fast response time. This transducer is temperature compensated for consistent operation between -30ºF and 130ºF, making it an ideal choice for clean rooms, hospitals, and commercial office buildings where NIST-traceable precision is non-negotiable.

• Enhanced Durability: The ePTFE Teflon filter prevents sensor drift caused by contaminants or high-humidity fog.
• Field Accuracy: Individually calibrated in environmental chambers to meet NIST traceable 2% accuracy standards.
• Circuit Protection: Equipped with short circuit and reverse polarity protection to prevent board damage during installation.
• Flexible Mounting: The low-profile housing fits standard 2" x 4" handy boxes or can be flush-mounted on flat surfaces.
• System Compatibility: The 4-20mA current loop signal is compatible with most industrial controllers and BAS platforms.

Is this sensor resistant to chemicals?
Yes, the bulk polymer sensor is specifically designed to resist most common chemical contaminants and is immune to the effects of condensing humidity.

Can the output be adjusted in the field?
The unit features easily accessible, non-interacting zero and span trimmers for precise calibration adjustments if required by local protocols.

What wire gauge should be used for the terminal block?
The unpluggable screw terminals are designed to accept up to 12 AWG wire, though standard HVAC shielded twisted pair is typically recommended for signal integrity.

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.