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

Low Pressure Sensor with 0-5"wc, 0-2.5"wc, 0-1.25"wc, -2.5"wc-2.5"wc, -1.25"wc-1.25"wc, or -0.625"wc-0.625"wc field selectable pressure ranges, 0-5Vdc or 0-10Vdc field selectable Output, 12-40Vdc/12-35Vac Supply voltage, and NEMA 4 Enclosure

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

The MAMAC Systems PR-274-R3-VDC is a high-accuracy, field-selectable low differential pressure sensor and transmitter designed for HVAC, building automation, and industrial air monitoring applications. Built with an ultra-stable glass-on-silicon capacitive sensing element, this solid-state transmitter delivers exceptional long-term stability, precision, and reliability in demanding environments.

Featuring up to six field-selectable pressure ranges in a single unit, selectable 0–5 VDC, 0–10 VDC, or 4–20 mA outputs, and a rugged NEMA 4 (IP66) painted metal enclosure, the PR-274-R3-VDC offers unmatched flexibility and durability for both unidirectional and bidirectional pressure measurements.

Key Features & Benefits

• Multiple Field-Selectable Pressure Ranges

  • 0–5" WC

  • 0–2.5" WC

  • 0–1.25" WC

  • ±2.5" WC

  • ±1.25" WC

  • ±0.625" WC

• High Accuracy: ±1% Full Scale

• Ultra-Sensitive Resolution: Resolves less than 0.00001 in. WC (0.0025 Pa)

• Selectable Outputs: 0–5 VDC, 0–10 VDC, or 4–20 mA (loop powered)

• Wide Power Supply Range: 12–40 VDC or 12–35 VAC

• Rugged NEMA 4 / IP66 Enclosure for harsh environments

• Uni-Directional or Bi-Directional Measurement

• Short-Circuit & Reverse Polarity Protection

Technical Specifications

• Sensor Type: Capacitive, solid-state, glass-on-silicon

• Pressure Range (Normal): 0 to 30" WC, uni- or bi-directional

• Accuracy: ±1% Full Scale

• Output Signals:

  • Voltage: 0–5 VDC or 0–10 VDC @ 1kΩ

  • Current: 4–20 mA @ 600Ω (loop powered)

• Supply Voltage:

  • 12–40 VDC @ 20 mA

  • 12–35 VAC @ 0.35 VA

• Overpressure (Burst): ±10 psid (68.95 kPa)

• Max Operating Pressure (Proof): ±30" WC (±7.47 kPa)

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

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

• Media Compatibility: Dry air and inert gases

• Wetted Materials: Silicone

• Process Connection: 3/16" OD brass fitting for 1/4" OD tubing

• Mounting: Surface mount using two #8 screws

• Wiring: Plug-in terminals (2 for 4–20 mA, 3 for voltage)

Applications

• HVAC air pressure monitoring

• Filter status and airflow measurement

• Building automation systems (BAS)

• Clean rooms and laboratories

• Fan and duct static pressure sensing

Certifications & Compliance

• CE Certified

• RoHS Compliant

• Conforms to EMC standards

The MAMAC Systems PR-274-R3-VDC Low Pressure Sensor is a versatile, high-performance solution for professionals who require precision, flexibility, and long-term reliability in low-pressure measurement applications. Ideal for both retrofit and new installations across commercial and industrial environments.