Often you will see a measurement of vacuum pressure described as an absolute pressure reading, so is there any difference between the two?
A vacuum pressure is one that is lower than the ambient environment surrounding pressure, and is typically measured relative to a perfect vacuum or full vacuum.
Since the reference pressure is not relative to another pressure and does not change, it is called the absolute reference or absolute pressure reference.
Featured vacuum measurement products
DS201 Combined Pressure Sensor, Display and Switch - Ceramic diaphragm diaphragm based pressure sensor, indicator & electronic switch with pressure ranges from 0-0.4 bar up to 0-600 bar.
450 mmHg vacuum range pressure gauge - The Baroli 05 pressure gauge can be supplied with a negative gauge vacuum range and display the pressure in millimetres of mercury (mmHg) pressure units.
Any pressure measured relative to a full vacuum, whether above or below the surrounding ambient air pressure, is called an absolute pressure.
A vacuum pressure can always be measured and defined as an absolute pressure, but an absolute pressure can also be used to define pressures outside the vacuum range.
Featured absolute pressure measurement products
IMCL Submersible Absolute Reference Depth Sensor - Absolute reference hydrostatic depth sensor with an IP68 sealed electrical interface, SS316L, Duplex or PVC housing and a mV, voltage or current output.
IWPT Wireless Battery Powered Pressure Sensor and Receiver - Wireless battery powered pressure sensor and receiver system for connecting pressure sensors without wires to a central wireless receiver which converts each received pressure signal channel to a 1-5Vdc, 4-20mA output, USB, Ethernet TCP, RS232 RTU, RS485 RTU or 2G 3G 4G mobile cellular network.
Related Help Guides
- Measuring liquid level in a sealed tank with a hydrostatic pressure sensor
- Measuring vacuum with negative gauge or absolute ranges
- What is the difference between gauge and absolute pressure measurement
- Can you measure vacuum using a gauge pressure range
- What does negative and positive gauge pressure mean
- Measuring negative pressure using a positive differential pressure range
- Measuring vacuum as a negative gauge pressure using a dp sensor
Related Technical Terms
- Absolute Pressure
- Barometric Pressure
- MSL – Mean Sea Level
- Negative Gauge Pressure
- Reference Pressure
- Suction Pressure
- Vacuum
