MAMAC Systems HU-224-3-MA Transducer

The MAMAC Systems HU-224-3-MA is a professional-grade duct humidity transducer engineered for reliable performance in demanding building automation and industrial process applications. This 4-20mA humidity sensor utilizes a high-speed polymer capacitance element, ensuring rapid response times and long-term stability across a 0-100% RH range. Designed for harsh environments, the sensing element features an ePTFE filter that protects against contaminants and condensation without compromising 3% accuracy. For field technicians, the HU-224-3-MA transducer offers an unpluggable terminal block and a rugged NEMA 4 (IP65) enclosure, streamlining installation in high-velocity ductwork. This 2-wire device operates on a wide 12-40Vdc supply voltage, providing the robustness required for precise HVAC relative humidity measurement in schools, hospitals, and data centers. With non-interacting zero and span trimmers, this duct mount RH transmitter allows for streamlined calibration and high repeatability in complex environmental control sequences.

• Engineered for Durability: The NEMA 4/IP65 enclosure and Teflon-protected sensor withstand prolonged exposure to high humidity, fog, and airborne contaminants.
• High Precision Calibration: Each unit is NIST traceable with 3% accuracy, ensuring tight control over humidification and economizer cycles.
• Technician-Friendly Design: Features an unpluggable screw terminal block and standard 1/2-inch conduit knockout for efficient field wiring.
• Circuit Protection: Integrated reverse polarity and short circuit protection prevent damage from common field wiring errors.
• Stable Output: The bulk polymer sensor provides a stable 4-20mA signal with negligible hysteresis even after saturation.

Can the HU-224-3-MA be used in high-velocity air ducts?
Yes, the rugged NEMA 4 enclosure and the protective ePTFE filter are specifically designed to handle the airflow and potential contaminants found in commercial duct applications.

What happens if the humidity sensor gets wet?
The polymer capacitance sensor is not affected by condensation. If it becomes contaminated with dust or oils, the probe can be cleaned with isopropyl alcohol to restore performance without a calibration shift.

How is this unit powered?
This is a 2-wire, loop-powered device that requires a 12-40Vdc unregulated supply voltage to generate the 4-20mA output signal.

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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.