MAMAC Systems HU-921-MA-8 Humidity Sensor

The MAMAC Systems HU-921-MA-8 is a high-performance OEM humidity sensor engineered for demanding HVAC/BAS applications, specifically in economizer control and packaged rooftop air handlers. This unit features a cross-linked bulk polymer capacitive sensing element, providing an ultra-fast response to changes in relative humidity. For precise monitoring, it delivers a 4-20mA 2-wire output for humidity and utilizes a 10,000 Ohm NTC thermistor (Carel) for accurate temperature sensing. With a 3% accuracy rating across the 30% to 70% RH range, it offers a cost-effective solution for dehumidification control without sacrificing reliability. The electronics are protected by an acrylic conformal coating and a proprietary ePTFE filter, ensuring the sensor remains resilient against condensing humidity, salt air, and pollutants. Built into a rugged, 20% glass-filled polycarbonate enclosure, the HU-921-MA-8 is designed for direct unit mounting in fresh air hoods or return air ducts.

• Advanced Protection: Features a hydrophobic and oleophobic ePTFE filter to shield sensitive components from water, oils, and airborne contaminants.
• NIST Traceable Calibration: Delivers ±3% RH accuracy, ensuring consistent performance for building automation systems.
• Extreme Environment Ready: Rated for 100% condensing humidity with a wide operating temperature range of -30°F to 130°F.
• Universal Compatibility: Standard 4-20mA humidity output and 10K NTC thermistor allow for seamless integration with most HVAC controllers and PLC systems.
• Durable Construction: The UL-95-V-0 polycarbonate enclosure with 1/4 inch quick-disconnect terminals simplifies field installation and maintenance.

Is this sensor suitable for high-moisture environments?
Yes, the HU-921-MA-8 is specifically designed to handle 100% condensing humidity thanks to its moisture-sealed electronics and specialized filter media.

What power supply is required for this humidity transmitter?
This model operates on a wide supply voltage range of 12-40Vdc, making it compatible with most standard control loops.

Can this sensor be used for duct-mounted applications?
While typically used for unit mounting or in fresh air hoods, its rugged design allows it to be installed in discharge or return air ducts where accurate humidity and temperature sensing is 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.