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PR-275-R8-MA | MAMAC Systems | Pressure

AIR DIFF PRESS XMTR,+/-1.00%, 0-7500 PA,+/-3750 PA, 4-20 MA, NO LCD, PANEL

Manufacturer:MAMAC Systems



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product family specifications

Supply Voltage

Current Output

12 to 40 VDC @ 20 mA

Volts Output

12 to 35 VAC @ 0.35 VA, 12 to 40 VDC @ 10 mA


±1% Full Scale

Signal Output

0-5/10V @ 1KΩ, 4-20mA @ 600Ω (loop powered)

Sensor Type



Range select switch and Zero & Span POT

Normal Measurement Range

0 to 30″WC, Uni- or Bi- Directional


(Burst) ±10 psid (68.95 kPa)

Max Operating Pressure

(Proof) ±30″WC, (±7.47 kPa)

Operating Temperature

25° to 150℉ (-4 to 65℃)

Operating Humidity

10 to 90% Non-condensing

Wetted Parts


Media Compatibility Inert

dry air

Process Connection

3/16″OD brass, for 1/4″ OD tubing

Wiring Plug-in terminals

2-(4-20mA), 3-(Volts)


2 , #8 screws

Enclosure Rating

Painted Metal, NEMA 4, (IP66), or panel mount


6.0″W x 2.2″H x 4.0″D, (15.2 x 5.6 x 10.2 cm)


1.0 lb (0.45 Kg)




5 years

product family features

  • 100% solid state, micro-machined, glass-on-silicon, ultra-stable capacitance sensor
  • As low as ± 0.05" W.C. (± 12.5 pa)
  • Up to 6 field selectable ranges in one unit
  • Can resolve less than 0.00001″ W.C. (0.0025 pa)
  • Two rugged steel enclosure types NEMA-4 (IP-65) or panel mount for ease of installation
  • Short circuit and reverse polarity protected
  • Conforms to EMC and RoHS standards

more information & related documents

Family Description

The MAMAC Systems PR274/275 Series Low Pressure Transmitter incorporates a new micro-machined glass-on-silicon (Gl-Si) capacitance sensor. This technology revolutionizes very low pressure measurement. Temperature related zero drift, calibration shift due to overpressure, non-repeatability, non-linearity, and extremely low pressure sensitivity have been some of the problems which have plagued the controls industry. The PR274/275 Series with the new Gl-Si technology not only addresses all of the above shortcomings, but for the first time offers a reliable, accurate means to measure and control building/room pressure, air flow, duct pressure, filter pressure drop, or any other extremely low pressure application. Up to six field selectable direct or compound ranges, two enclosure types, field selectable outputs, fully temperature compensated NIST traceable accuracy, non-interacting zero and span adjustments, short circuit and reverse polarity protected output, and a liberal five year warranty are some of the features which make the PR274/275 Series the industry's highest performance, ultra-stable, low pressure sensor.

Kele Description

AIR DIFF PRESS XMTR,+/-1.00%, 0-7500 PA,+/-3750 PA, 4-20 MA, NO LCD, PANEL


MAMAC Systems

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