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What is the difference between vacuum and absolute pressure

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.

Vacuum measurement products
  • LEO3 Current or Digital Output Pressure Gauge
  • DMK331P Flush Diaphragm Pressure Sensor
  • 300 mmHg absolute vacuum pressure transducer with 10 volts output
  • 1000 mbar vacuum transmitter for use with waste toner dust

Request info on vacuum measurement products for your application.

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.

What is the difference between vacuum and absolute pressure
Absolute pressure measurement products
  • 800mbar absolute range 4-20mA output high temperature protected OEM pressure sensor
  • 700 bar pressure gauge with fast update rate peak memory
  • 3000 psi absolute 0-20mA output mineral oil pressure sensor for hydraulic control use
  • 0.5 to 4.5 volt output pressure sensor for 5 volt input with 30 psi absolute range

Request info on absolute pressure measurement products for your application.

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