What does the suffix a, abs, d, dp and diff, g, rel and sg mean after the pressure units in a pressure range?

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.

Contents

Vented Gauge Reference Pressure Range

Measuring pressure with reference to atmospheric pressure, also referred to as Relative and Vented Gauge:

Featured vented gauge reference related products

Retrofitting ship bubbler tank gauging system with 22mm submersible level probe - A narrow 22mm diameter submersible level transmitter was used to replace an old bubbler system on a ship, providing an easy retrofit solution for fuel tanks without mechanical changes.
Recordable indicator and sensor up to 30000 psi for pressure test rig - Accurate and reliable pressure measurement up to 30,000 psi with integrated data recording. Ideal for demanding pressure test rig applications.

Sealed Gauge Reference Pressure Range

Not vented to atmospheric pressure, but instead the reference is fixed to 1 bar.

Featured sealed gauge reference related products

SSPT Subsea Wet-Mateable Electrical Connector Pressure Sensor - This stainless steel ceramic sensing diaphragm based subsea connector pressure sensor provides a unamplified ratiometric millivolt output or an amplified analogue output signal corresponding to ranges from 0…1 bar (14.50 psi) up to 400 bar ( 5800 psi).
Event triggered high sampling rate pressure logger - This pressure logger can record for months at time at a slow logging rate, and when a predefined event threshold is exceeded it will record pressure at a much faster rate.

Absolute Reference Pressure Range

Referenced to absolute zero pressure or a perfect vacuum

Featured absolute reference related products

DCT531P RS485 Modbus RTU Flush Pressure Sensor - RS485 Modbus RTU serial interface pressure sensor with exposed all welded stainless steel 316L flush diaphragm in ranges from 100mb up to 40 bar gauge or absolute.
S12S SDI-12 Coms IP68 Pressure and Temperature Sensor - Combined pressure and temperature sensor with a 1200 baud rate serial data interface as defined by the SDI-12 support group.

Differential Pressure Range

The difference in pressure at point B compared to the pressure at point A.

d
D
diff
DIFF
dp
DP

Featured differential pressure related products

Bidirectional -50 to +50 Pa diff pressure transmitter with user calibration adjustment - Enhance your hvac or filter monitoring system with this accurate and durable low differential pressure transmitter featuring user-adjustable zero and span.
10Pa diff range 0-20mA output air pressure sensor for automotive component testing - A very low range pressure sensor for automotive component testing use to measure pressure of air over a range of 0 to 10 Pa diff from two barbed tube hose connections, and sending the corresponding 0-20mA signal through the DIN plug electrical connection.

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.