MAMAC Systems HU-224-2-MA Transducer

The MAMAC Systems HU-224-2-MA is a high-performance duct humidity transducer engineered for precise atmospheric monitoring in demanding HVAC and building automation environments. Designed for direct insertion into supply, return, or exhaust air streams, this unit features a cross-linked bulk polymer capacitive sensing element that provides 2% RH accuracy across the full 0–100% range. To ensure long-term stability and sensor protection, the probe incorporates a proprietary hydrophobic and oleophobic ePTFE filter, shielding the internals from condensation, airborne pollutants, and salt air. Operating on a versatile 12-40 VDC supply voltage, the 2-wire 4-20mA output is temperature-compensated from -30°F to 130°F, ensuring linear performance even in unconditioned mechanical spaces. The rugged NEMA 4 (IP65) steel enclosure and thick-walled aluminum probe provide the durability required for industrial process control, clean rooms, and commercial ventilation systems.

Key Benefits:

• Enhanced Sensor Protection: Integrated ePTFE filter prevents sensor drift caused by moisture and contaminants.
• Field Reliable Enclosure: NEMA 4 rated housing protects against incidental contact and environmental spray.
• Wide Supply Range: Compatible with 12-40 VDC, facilitating integration into various 24V control loops.
• Fast Response Times: Louvered industrial design ensures rapid detection of humidity fluctuations for tighter psychrometric control.
• Simple Installation: Features an unpluggable screw terminal block and external mounting bracket for efficient field wiring.

Common Questions:

What is the maximum load impedance for the 4-20mA loop?
With a 40 VDC supply, the unit can handle up to 1500 ohms, dropping to 250 ohms at a minimum 12 VDC supply.

How does this unit handle high-saturation conditions?
The bulk polymer element and hydrophobic filter allow for reliable recovery from 100% saturation without permanent calibration shifts.

Is the sensing element field-replaceable?
The HU-224-2-MA is a factory-calibrated assembly; the ePTFE filter provides the primary defense to maximize the service life of the integrated sensor.

This item is not eligible for free shipping.

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.