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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
  • 50 psi g freshwater pressure transducer with 10 Vdc output signal
  • Recordable indicator and sensor up to 30000 psi for pressure test rig
  • Vacuum gauge to measure both absolute & negative gauge pressure
  • +/- 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
  • 15000 psi combined pressure gauge and logger with USB interface
  • UPS-HSR USB Pressure Sensor with High Sample Rate Logging
  • Event triggered high sampling rate pressure logger
  • 700 bar pressure gauge with fast update rate peak memory

Absolute Reference Pressure Range

Referenced to absolute zero pressure or a perfect vacuum

  • a
  • A
  • abs
  • ABS
Absolute reference related products
  • Cleaned oil contamination free 200bar absolute range 0-10V out pressure sensor
  • 1000 mmHg abs range air pressure gauge with 1/4 NPT male fitting
  • DS201P High Range Flush Pressure Gauge, Switch and Sensor
  • 700 bar pressure gauge with fast update rate peak memory

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
  • 1.5 inWG differential pressure transducer to control positive pressure inside a building
  • DP sensor for -1 to 3 bar differential water pressure and 20 bar overpressure
  • 15psi dp range 4-20mA air pressure sensor for chamber airflow testing use on a 15psi line
  • 70 bar range dp transmitter with a 450 bar overpressure rating in both directions

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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Help Guides

  • Measuring negative pressure using a positive differential pressure range
  • Pressure Sensor Accuracy Specifications
  • Process Connections
  • Determining calibration error of Bourdon tube pressure gauge
  • Measurement Accuracy
  • Supply voltage and load resistance considerations for pressure transmitters
  • Measuring vacuum with negative gauge or absolute ranges
  • What is the difference between gauge and absolute pressure measurement
  • Measuring the difference in air pressure between rooms
  • How to Connect a 4-20mA Current Loop Pressure Transmitter
  • Advantages and Disadvantages of using a 4 to 20 mA Signal
  • Determining water tank volume using hydrostatic pressure
  • How do you measure the volume of a liquid using pressure
  • What is the difference between vacuum and absolute pressure
  • What does negative and positive gauge pressure mean

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