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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
  • Vacuum gauge to measure both absolute & negative gauge pressure
  • Recordable indicator and sensor up to 30000 psi for pressure test rig
  • KL1 Cable Junction Box for Submersible Level Transmitters
  • +/- 30 inches of water compound range pressure transmitter

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
  • 5000 psi hydraulic pressure transmitter with M12 electrical connector 5000 psi hydraulic pressure transmitter with M12 electrical connector
  • Submersible sensor for measuring sludge pressure in pipe
  • 15000 psi combined pressure gauge and logger with USB interface
  • OEM water depth sensor for integrating inside a Sonde

Absolute Reference Pressure Range

Referenced to absolute zero pressure or a perfect vacuum

  • a
  • A
  • abs
  • ABS
Absolute reference related products
  • 400 bar high range 0-10Vdc output engine oil pressure sensor with snubber for hydraulic control use
  • Baroli 02P Low Range Flush Diaphragm Digital Pressure Gauge
  • 30 psi absolute vacuum pressure transmitter with 4 to 20mA output 30 psi absolute vacuum pressure transmitter for process plant installations
  • 20 kg/cm² range 5Vdc output pressure transducer for potable water

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
  • PD39X High Differential Pressure Transmitter PD39X High Differential Pressure Transmitter
  • 250″wc Orifice plate flow measurement dp transmitter
  • 4 x clean rooms pressure, humidity & temperature measurement system
  • 200 bar gradient pressure sensor with RS232 for use on oil

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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