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:
- KL1 Cable Junction Box for Submersible Level Transmitters
- +/- 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
Sealed Gauge Reference Pressure Range
Not vented to atmospheric pressure, but instead the reference is fixed to 1 bar.
- Submersible sensor for measuring sludge pressure in pipe
- 700 bar pressure gauge with fast update rate peak memory
- 250 bar pressure transducer with 20 millivolt full scale output
- Event triggered high sampling rate pressure logger
Absolute Reference Pressure Range
Referenced to absolute zero pressure or a perfect vacuum
- Measuring steam pressure up to 10bar with analog/digital output
- SWL Marine Bronze Submersible Level Sensor
- 10 metre range non-vented submersible absolute range pressure and barometric sensor
- 500 kPa absolute intrinsically safe pressure transmitter
Differential Pressure Range
The difference in pressure at point B compared to the pressure at point A.
- 150psi freshwater differential pressure sensor & panel indicator
- 70 bar range dp transmitter with a 450 bar overpressure rating in both directions
- -200 to 200 Pa bi-directional range 4-20mA output dp pressure transmitter for venturi tube
- Clean Room Monitor for Air Differential Pressure, Temperature and Humidity – PMDS4
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.