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:
Sealed Gauge Reference Pressure Range
Not vented to atmospheric pressure, but instead the reference is fixed to 1 bar.
- UPS-HSR USB Pressure Sensor with High Sample Rate Logging
- SSPT Subsea Wet-Mateable Electrical Connector Pressure Sensor
Absolute Reference Pressure Range
Referenced to absolute zero pressure or a perfect vacuum
- DMP331P Hygienic Flush Pressure Transmitter
- DS200 Combined Pressure Switch, Gauge and Sensor
- IMP Low Cost Pressure Sensor
- DMK457 Marine Approved Pressure Transmitter
Differential Pressure Range
The difference in pressure at point B compared to the pressure at point A.
- DPS Low Differential Pressure Transmitter
- XMD Process Plant DP Cell Differential Pressure Transmitter
- PD33X Digital Differential Pressure Sensor
- Low Differential Pressure Transmitters
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.