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Can you measure vacuum using a gauge pressure range

The most common type of pressure range for pressure measurement instrumentation is one which has a gauge reference. So if you want to measure vacuum pressure, it would be convenient to use a gauge pressure device which is the most widely available pressure range format. So is it possible to measure vacuum with a gauge pressure range instrument, and if so how do you select the correct pressure range?

There are different levels of vacuum quality, from low partial, to very high, but they we all reside within the confines of a pressure range between local atmospheric air pressure and full vacuum where no pressure exists at all.

A vacuum, regardless of quality, which is generated in vessel or chamber, will always be measured as a negative pressure relative to the ambient environment air pressure surrounding the vessel or chamber.

Negative gauge pressure measurement products
  • Low vacuum leak detection 4-20mA current loop sensor & gauge
  • Vacuum range 0-20 milliamp output pressure transducer for leak testing
  • DMP331i Adjustable range pressure sensor for scaling -1 to +1 bar g
  • Vacuum logger to measure 0 to -1 bar suction or 0 to 1 bar absolute

Request info on negative gauge pressure measurement products for your application.

A gauge reference pressure measuring device provides pressure readings relative to ambient air pressure. A positive gauge pressure range would not be suitable for measuring a vacuum, since it will only measure pressures that are greater than atmospheric pressure. Therefore only gauge pressure ranges that include a negative pressure range will be suitable for measuring a vacuum pressure.

For example a 0 to -1 bar or -15 to 0 psi gauge range will cover the entire range of vacuums, and is a popular range offered by manufacturers. It can also be combined with positive pressure ranges which are called compound pressure ranges, such as -1 to +10 bar g or -760 mmHg to + 100 psi g.

If you only interested in measuring a partial or low vacuum you will need a smaller gauge range such as 0 to -1 psi or 0 to -250 mbar g, which provide a better accuracy and resolution than the larger ranges, for measuring the full vacuum range.

Low range negative gauge pressure measurement products
  • ATEX approved negative 10 mbar vacuum pressure transmitter
  • Low vacuum leak detection 4-20mA current loop sensor & gauge
  • Negative 500 mmH2O g range 4-20mA output pressure sensor
  • Low range vacuum pressure logger for 0 to -60 inH2O g

Request info on low range negative gauge pressure measurement products for your application.

A gauge pressure range is not suitable for measuring high vacuum pressures, since you can only use a full vacuum range device, which compromises the accuracy and resolution so much that the errors are greater than the difference between full vacuum and the high vacuum reading.

Gauge pressure measurement devices which are suitable for measuring vacuum
will often be described as having a negative gauge range, or a compound range for measuring both vacuum and positive pressure.

Can you measure vacuum using a gauge pressure range
Negative gauge pressure measurement products
  • Standard version of LEO Record Digital vacuum/pressure recorder to replace circular paper chart
  • 500 mbar vacuum sensor for use on fresh water with 4 to 20 milliamp output
  • HART coms compatible vacuum transmitter for -1 to 0 bar g
  • 0 to -300 mmH2O vacuum transmitter

Request info on negative gauge pressure measurement products for your application.

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Product Selection Guides

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Application Selection Guides

  • Absolute Pressure
  • Dual Temperature and Pressure
  • Flush Diaphragm
  • High Frequency Response
  • Leak Testing
  • Low Pressure Range
  • Oxygen Service
  • Submersible
  • Vacuum

Help Guides

  • Using absolute pressure sensors to measure hydrostatic level
  • Measuring vacuum with negative gauge or absolute ranges
  • Measuring the difference in air pressure between rooms
  • What does negative and positive gauge pressure mean
  • Measuring the Pressure of Hot Media
  • Determining water tank volume using hydrostatic pressure
  • How to get a 10 volt signal from a 4-20mA output pressure sensor

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