MAMAC Systems PR-274-R2-MA Pressure Sensor

The MAMAC Systems PR-274-R2-MA is a professional-grade low pressure sensor designed for precise monitoring in critical HVAC and building automation environments. Featuring a micro-machined glass-on-silicon (Gl-Si) capacitance sensor, this unit delivers exceptional stability and high sensitivity, making it ideal for measuring duct static pressure, room pressure, and filter pressure drop. The multi-range pressure transmitter includes six field-selectable ranges—0-1", 0-0.5", 0-0.25", -0.05 to +0.05", -0.25 to +0.25", and -0.125 to +0.125" w.c.—allowing you to standardize on one part for multiple applications. The 4-20mA 2-wire output ensures reliable signal transmission over long distances when integrated into BAS control systems. Housed in a rugged NEMA 4 enclosure, this sensor is built to withstand demanding mechanical room conditions while offering unpluggable screw terminal blocks for streamlined installation.

• Versatile Range Selection: Six field-selectable low differential pressure ranges eliminate the need to stock multiple fixed-range transmitters.
• Advanced Sensor Technology: The ultra-stable capacitance sensor resists zero drift and calibration shifts associated with overpressure up to 10 PSID.
• High Environmental Protection: A gasketed NEMA 4 (IP65) steel enclosure provides dust and splash protection for long-term reliability in utility spaces.
• Simplified Commissioning: Non-interacting zero and span trimmers allow for precise field adjustments without affecting the linearity of the 4-20mA sensor.

What media is compatible with the PR-274-R2-MA?
This transmitter is designed specifically for clean, dry air or non-corrosive inert gases. It should not be used with liquids or in hazardous, explosive environments.

How do I configure the pressure range?
The unit features internal DIP switches that allow you to select between uni-directional and bi-directional (compound) ranges at the time of installation.

Can this sensor be mounted in any orientation?
For maximum accuracy, the sensor should be mounted vertically as indicated by the arrows on the enclosure. Mounting in other positions may cause a small zero shift that must be corrected using the zero trimmer.

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.