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.
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
- +/- 30 inches of water compound range pressure transmitter
- Vacuum gauge to measure both absolute & negative gauge pressure
- 50 psi g freshwater pressure transducer with 10 Vdc output signal
- Recordable indicator and sensor up to 30000 psi for pressure test rig
Sealed Gauge Reference Pressure Range
Not vented to atmospheric pressure, but instead the reference is fixed to 1 bar.
- sg
- SG
- Water system peak demand pressure and flow data logger
- Absolute Unvented Reference Hydrostatic Liquid Level Sensors
- OEM water depth sensor for integrating inside a Sonde
- 250 bar pressure transducer with 20 millivolt full scale output
Absolute Reference Pressure Range
Referenced to absolute zero pressure or a perfect vacuum
- a
- A
- abs
- ABS
- Wind turbine USB PC logging pressure & temperature sensor
- Agricultural irrigation low price 50psia range 0.5-4.5V ratiometric output water pressure sensor
- 100psia range 0-10Vdc output signal air pressure sensor for manufacturing use
- 10mH2O absolute 4-20mA marine approved seawater pressure sensor for bilge water leak testing use
Differential Pressure Range
The difference in pressure at point B compared to the pressure at point A.
- d
- D
- diff
- DIFF
- dp
- DP
- 3 bar differential pressure sensor for sea water
- Solvent compatible +/-100mWG dp transmitter with PTFE seals
- 15,000 Pa DP Transmitter with built-in digital display
- 1 inH2O dp range wall mounted HEPA air filter pressure gauge with 4-20mA output
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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