MAMAC Systems PR-274-R3-VDC Low Pressure Sensor

The MAMAC Systems PR-274-R3-VDC is a high-precision low differential pressure transmitter engineered for critical air monitoring in HVAC and building automation systems. Utilizing an ultra-stable glass-on-silicon capacitive sensing element, this unit maintains exceptional long-term calibration stability and resistance to drift, even in high-vibration environments. For maximum field flexibility, it features six field-selectable pressure ranges (including unidirectional and bidirectional scales) and selectable 0-5 VDC or 0-10 VDC outputs. The 4-20 mA current loop option is also available for long-distance signal transmission. Encased in a rugged NEMA 4 (IP66) enclosure, the PR-274-R3-VDC is designed for duct static pressure, filter status monitoring, and cleanroom applications. With an accuracy of ±1% full scale and a resolution better than 0.00001 in. WC, it provides the granular data necessary for advanced VAV control and laboratory safety. This HVAC pressure sensor supports a wide supply voltage range of 12-40 VDC or 12-35 VAC, ensuring compatibility with various BAS controllers.

Key Benefits for Technicians:

• Reduced Inventory Requirements: A single unit covers ranges from 0-5" wc down to ±0.625" wc, reducing the need to stock multiple dedicated sensors.
• High Environmental Resilience: The NEMA 4 rated painted metal enclosure protects internals from moisture and airborne contaminants.
• Seamless Integration: Field-selectable voltage outputs (0-5/0-10 VDC) ensure 100% compatibility with most DDC systems and industrial PLCs.
• Maintenance-Free Reliability: Solid-state capacitive technology eliminates mechanical wear, providing consistent static pressure measurement over time.
• Installation Safety: Integrated short-circuit and reverse polarity protection prevents hardware damage during commissioning.

Common Questions:

What is the maximum pressure this sensor can handle without damage?
The PR-274-R3-VDC has a proof pressure of ±30" WC and a burst pressure rating of ±10 psid. Exceeding these limits can compromise the sensing element.

How do I configure the pressure range?
Ranges are set via internal DIP switches. You can select between 0-5", 0-2.5", 0-1.25", ±2.5", ±1.25", and ±0.625" WC scales without needing external calibration tools.

Is this sensor compatible with wet media?
No, this transmitter is designed specifically for dry air and inert gases. Exposure to liquid or corrosive moisture will damage the silicone-wetted materials.

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.