MAMAC Systems PR-276-R11-MA Pressure Sensor

The MAMAC Systems PR-276-R11-MA is a professional-grade duct static pressure transmitter designed for precise HVAC automation and VAV system monitoring. Built around a micro-machined, glass-on-silicon (Gl-Si) capacitance sensor, this unit offers exceptional stability and NIST traceable accuracy of ±1.0% FS, even at low pressure levels. As a veteran-preferred HVAC pressure sensor, it features three field selectable pressure ranges (0-15"wc, 0-7.5"wc, or 0-3.75"wc), allowing technicians to adapt the device to various commercial ductwork requirements without carrying multiple SKUs.

Installation is streamlined via the integrated static pressure probe and NEMA 4 enclosure, which eliminates the need for separate pick-up tubes or additional control panels. The 4-20mA 2-wire output ensures reliable signal transmission over long distances when powered by a 12-40Vdc supply. This duct pressure sensor is housed in a rugged 18-gauge steel casing with a gasketed cover, providing effective protection against moisture and contaminants in harsh mechanical room environments.

• Field Selectable Ranges: Easily configure for 0-15", 0-7.5", or 0-3.75"wc using internal switches to match specific air handling unit specs.
• Integrated Pressure Tip: Standard 8-inch aluminum probe with dual orifices and baffles reduces velocity-induced errors for accurate static pressure readings.
• Industrial Durability: The NEMA 4 (IP65) rated enclosure and 6061T aluminum probe are built for reliable service in industrial HVAC applications.
• Protected Electronics: Features short circuit and reverse polarity protection to prevent board damage during site HVAC troubleshooting or commissioning.

How do I calibrate the zero point on the PR-276-R11-MA?

While the Gl-Si sensor has negligible mounting orientation error, you can use the onboard zero trimmer pot to fine-tune the signal after mounting the pressure transducer. Ensure the system is at zero pressure before adjustment.

Can this sensor be used for liquid pressure monitoring?

No, this model is specifically engineered for clean, dry air or inert gas media. Exposure to liquids or corrosive fumes will damage the capacitive sensor element.

What wiring gauge is recommended for the 4-20mA loop?

The unpluggable screw terminal block accepts up to 12 AWG wire. For most BMS controller runs, standard 18 AWG shielded twisted pair is sufficient to maintain signal integrity.

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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.