MAMAC Systems PR-275-R2-MA Pressure Sensor

Low Pressure Sensor with 0-1"wc, 0-0.5"wc, 0-0.25"wc, -0.05"wc-0.05"wc, -0.25"wc-0.25"wc, or -0.125"wc-0.125"wc field selectable pressure ranges, 4-20mA 2-wire Output, 12-40Vdc Supply voltage, and Panel Mount Chassis

MAMAC Systems PR-275-R2-MA Pressure Sensor – Low Differential Pressure Transmitter, 4–20mA

The MAMAC Systems PR-275-R2-MA Pressure Sensor is a precision low differential pressure transmitter engineered for accurate, stable, and reliable HVAC and building automation measurements. Featuring field-selectable pressure ranges, a loop-powered 4–20mA output, and a capacitive sensing element, this sensor delivers exceptional resolution and long-term stability in demanding environments.

Key Features

• Field-Selectable Ranges – Supports multiple low-pressure configurations:

  • 0–1" W.C.

  • 0–0.5" W.C.

  • 0–0.25" W.C.

  • -0.05" to 0.05" W.C.

  • -0.25" to 0.25" W.C.

  • -0.125" to 0.125" W.C.

• Uni- or Bi-Directional Measurement

• High Accuracy – ±1% Full Scale

• Ultra-Stable Capacitive Sensor – Micro-machined glass-on-silicon design

• Excellent Resolution – Detects extremely small pressure changes

• 4–20mA 2-Wire Output – Loop powered

• Wide Supply Voltage – 12 to 40 VDC

• Solid-State Reliability – No moving parts

• Protection – Short circuit & reverse polarity protected

• Compliance – CE & RoHS approved

Specifications

• Model: PR-275-R2-MA

• Type: Pressure Transmitter

• Measurement Range: Up to ±1 in W.C. (field selectable)

• Accuracy: ±1% Full Scale

• Sensor Type: Capacitive

• Output Options:

  • 4–20mA (loop powered)

  • 0–5V / 0–10V (voltage output models)

• Supply Voltage: 12–40 VDC @ 20 mA

• Overpressure (Burst): ±10 psid

• Proof Pressure: ±30" W.C.

• Operating Temperature: 25°F to 150°F (-4°C to 65°C)

• Operating Humidity: 10–90% RH, non-condensing

• Media Compatibility: Inert gases / dry air

• Wetted Materials: Silicone

• Process Connection: 3/16" OD brass (fits 1/4" OD tubing)

• Mounting: Surface / Panel Mount Chassis

• Enclosure Options: Panel mount or NEMA-4 (IP-65)

• Dimensions: 6.0"W × 2.2"H × 4.0"D

• Weight: 1.0 lb

• Approvals: CE, RoHS

• Warranty: 5 Years

Performance Advantages

• Resolves pressure as low as ±0.05 in W.C. (±12.5 Pa)

• Can detect changes below 0.00001 in W.C.

• Designed for long-term drift-free stability

• Ideal for critical low-pressure monitoring

Typical Applications

• HVAC duct static pressure

• Filter monitoring

• Cleanroom pressure control

• Building automation systems (BAS)

• Airflow and differential pressure measurement

Why Choose the PR-275-R2-MA?

The PR-275 series combines laboratory-grade precision, field flexibility, and rugged construction, making it a trusted solution for professionals requiring accurate low-pressure sensing.

Compatibility Note

Verify pressure range selection and output requirements before installation.