MAMAC Systems HU-921-5-VDC-12 Humidity Sensor

For high-performance environmental control, the MAMAC Systems HU-921-5-VDC-12 is a reliable HVAC humidity sensor designed for precise relative humidity and temperature monitoring. This duct mount humidity sensor features a cross-linked bulk polymer capacitive element, providing ±3% RH accuracy over a 30% to 70% range. Built for rugged industrial environments, the sensor is protected by a proprietary ePTFE filter that is both hydrophobic and oleophobic, shielding the sensing element from moisture, pollutants, and salt air. The unit includes a 10,000 ohm NTC Type II thermistor for accurate temperature readings and operates with a stable 12-40 VDC or 12-35 VAC supply voltage. The 0-10 VDC output ensures seamless integration with standard building automation systems and HVAC controllers. Encased in a UL-94-V-0 polycarbonate enclosure, it is suitable for fresh air hoods and return air ducts, maintaining performance even in 100% condensing humidity conditions.

Key Benefits

• Industrial Durability: Rugged 20% glass-filled polycarbonate enclosure handles demanding mechanical stress.
• Chemical Resistance: Conformal coated electronics and ePTFE filter prevent sensor drift caused by contaminants.
• System Compatibility: Universal 10K Ohm Type II NTC thermistor and 0-10 VDC signal output for broad controller support.
• Field Service Friendly: Includes 1/4" quick-disconnect terminals and an external mounting bracket for fast installation.
• Fast Response: Optimized for high-speed air handler monitoring and economizer control strategies.

Common Questions

How does this sensor handle high-condensation environments?
The HU-921 series is engineered for 100% condensing humidity. The internal circuitry is moisture-sealed with an acrylic coating, and the expanded Teflon filter prevents liquid water from reaching the polymer element.

Can the HU-921-5-VDC-12 be installed in fresh air intakes?
Yes, the sensor is specifically designed for installation in fresh air hoods and discharge ducts. Its temperature-compensated range of -30°F to 130°F ensures stable readings in outdoor air applications.

What is the required power supply for the 0-10V output?
This model requires a supply voltage between 12-40 VDC or 12-35 VAC to provide a stable analog output signal.

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.