MAMAC Systems PR-274-R4-MA Pressure Sensor

The MAMAC Systems PR-274-R4-MA is a high-precision low pressure sensor designed for critical monitoring of clean dry air or inert gases in commercial and industrial HVACR environments. Built with a micro-machined, glass-on-silicon capacitance sensor, this differential pressure transducer provides field technicians with exceptional stability and a 10 PSID overpressure rating to prevent zero shift during system surges. The unit features six field selectable pressure ranges, including 0-30"wc, 0-15"wc, and 0-7.5"wc, as well as bi-directional compound ranges down to +/- 3.75"wc, allowing for versatile deployment across various duct static and filter monitoring applications.

Housed in a rugged 18-gauge steel NEMA 4 enclosure, the PR-274-R4-MA is engineered for survival in harsh mechanical rooms. It operates on a wide 12-40 VDC supply voltage and delivers a standard 4-20mA 2-wire output, ensuring compatibility with most building automation systems. Integration is streamlined via unpluggable screw terminal blocks and non-interacting zero/span trimmers, facilitating precise NIST-traceable calibration without affecting linearity. For reliable HVAC pressure monitoring, this 100% solid-state device eliminates the common maintenance issues associated with mechanical drift in low-velocity airflow systems.

• Selectable Versatility: On-site configuration of six narrow-span ranges reduces the need to carry multiple fixed-range transmitters.
• Rugged Durability: NEMA 4 (IP65) rated housing protects sensitive electronics from dust and moisture in demanding environments.
• Superior Stability: Silicon capacitance technology minimizes temperature-related zero drift and maintains long-term accuracy.
• Circuit Protection: Built-in reverse polarity and short circuit protection prevent damage during field wiring and commissioning.

How do I select the desired pressure range on the PR-274-R4-MA?
Ranges are configured via internal DIP switches. Technicians can toggle between uni-directional and bi-directional modes to match specific system requirements like duct static or cleanroom pressure.

What is the maximum overpressure this sensor can handle?
The unit is rated for up to 10 PSID overpressure. This allows the sensor to survive accidental pressure spikes or line blockages without requiring a full recalibration of the 4-20mA signal.

Can this device be mounted in any orientation?
For maximum accuracy at low-pressure scales, it should be mounted vertically. Always utilize a J-loop in the pneumatic tubing to prevent condensate from entering the sensor ports.

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.