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
- Vacuum gauge to measure both absolute & negative gauge pressure
- +/- 30 inches of water compound range pressure transmitter
- 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
- 250 bar pressure transducer with 20 millivolt full scale output
- Event triggered high sampling rate pressure logger
- Submersible sensor for measuring sludge pressure in pipe
- Logger for verifying water supply pressure over 7 days
Absolute Reference Pressure Range
Referenced to absolute zero pressure or a perfect vacuum
- a
- A
- abs
- ABS
- 15000 psi combined pressure gauge and logger with USB interface
- Vacuum gauge to measure both absolute & negative gauge pressure
- Calibrator for testing absolute pressure measurement devices
- 0.5 to 4.5 volt output pressure sensor for 5 volt input with 30 psi absolute range
Differential Pressure Range
The difference in pressure at point B compared to the pressure at point A.
- d
- D
- diff
- DIFF
- dp
- DP
- Air blower 100 inWG range differential pressure transducer
- Hydro power plant sea water high accuracy DP transmitter
- 0.1 inH2O differential range 0-10Vdc output between rooms air pressure sensor
- Low delta P sensor with 200mmH2O range and response time < 5ms
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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