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:
- 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.
- 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
- 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 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.
- 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.