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What does the suffix a, abs, d, dp and diff, g, rel and sg mean after the pressure units in a pressure range?

There is a loose convention across manufacturers for designating the type of reference that a pressure sensing device has, which can be confusing if you are unfamiliar with specifying this often overlooked but critical specification parameter.

To help identify the reference of a particular pressure range found on a product label or technical data sheet a list of abbreviated suffixes is provided below.

Contents

  • Vented Gauge Reference Pressure Range
  • Sealed Gauge Reference Pressure Range
  • Absolute Reference Pressure Range
  • Differential Pressure Range

Vented Gauge Reference Pressure Range

Measuring pressure with reference to atmospheric pressure, also referred to as Relative and Vented Gauge:

  • g
  • G
  • rel
  • REL
  • vg
  • VG
Vented gauge reference related products
  • Recordable indicator and sensor up to 30000 psi for pressure test rig
  • KL1 Cable Junction Box for Submersible Level Transmitters
  • Vacuum gauge to measure both absolute & negative gauge pressure

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Sealed Gauge Reference Pressure Range

Not vented to atmospheric pressure, but instead the reference is fixed to 1 bar.

  • sg
  • SG
Sealed gauge reference related products
  • UPS-HSR USB Pressure Sensor with High Sample Rate Logging

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Absolute Reference Pressure Range

Referenced to absolute zero pressure or a perfect vacuum

  • a
  • A
  • abs
  • ABS
Absolute reference related products
  • 300°C max temperature, 0 to 300 bar, high range pressure sensor
  • Vacuum gauge to measure both absolute & negative gauge pressure
  • DMP331 Precision Pressure Transmitter
  • Absolute Pressure Transmitters

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Differential Pressure Range

The difference in pressure at point B compared to the pressure at point A.

  • d
  • D
  • diff
  • DIFF
  • dp
  • DP
Differential pressure related products
  • DMD341 Compact Differential Air Pressure Sensor
  • 0-100Pa air pressure transducer with a 0-10V analog output
  • 1 psi delta pressure sensor with 4 to 20 mA output
  • DPS300 User Switchable Pressure Range, Volts or Current Output Low DP Sensor

Request info on differential pressure related products for your application.

On product marking labels or any document that includes a description of the pressure range, the reference type is included after the pressure unit type e.g. 15 psi abs or 15 psia.

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