MAMAC Systems VA-921-VDC-7 Humidity Sensor

The MAMAC Systems VA-921-VDC-7 humidity sensor is a rugged, wall-mount instrument engineered for critical environmental monitoring in building automation systems (BAS) and industrial HVAC applications. Utilizing a high-stability resistive polymer sensing element, this transducer delivers a precise 0-10 VDC output (or field-selectable 0-5 VDC) proportional to 0% to 100% relative humidity. It is designed to maintain ±2% RH accuracy, providing the reliable data required for effective enthalpy control and indoor air quality (IAQ) management.

The VA-921-VDC-7 features an IP65-rated enclosure, protecting internal electronics from dust and moisture in demanding field conditions like data centers, clean rooms, and commercial air handlers. For technicians, the solid-state design ensures minimal drift and long-term calibration stability. The unit's wide supply voltage range (typical 12-40 VDC or 12-35 VAC) and reverse polarity protection simplify field installation and integration with programmable logic controllers (PLCs) and direct digital control (DDC) hardware.

Key Benefits:

• High Accuracy: Maintains ±2% RH precision across the full 0-100% range for tighter climate control.
• Rugged Reliability: IP65-rated housing ensures performance in industrial processes and wash-down environments.
• Seamless Integration: Standard 0-10 VDC signal is compatible with most HVAC controllers and monitoring systems.
• Fast Response: Resistive polymer element rapidly detects humidity shifts for immediate system adjustment.
• Simplified Wiring: Features reverse polarity protection to prevent damage during field commissioning.

Common Questions:

Is the VA-921-VDC-7 compatible with 24VAC power systems?
Yes, this model typically supports 12-35 VAC or 12-40 VDC, making it suitable for standard HVAC control power.

Does this sensor require field calibration?
The VA-921-VDC-7 is factory-calibrated using NIST-traceable standards; however, veteran technicians should verify readings against a psychrometer during annual maintenance to ensure sensor accuracy.

Can this be mounted in high-moisture areas?
While the electronics are IP65 protected, the sensing element should be protected from direct water saturation and high-velocity debris to maintain response time.

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.