Outside of North America, the mbar (a) unit of vacuum measurement is used. A vacuum is correctly measured with a differential pressure transducer that has one port open to atmosphere. In Europe, which measures most things in metric terms, the vacuum measurement unit in general use is the millibar or mbar.

Measuring vacuum pressure is a fundamental element of all vacuum applications. Whether you are measuring pressures below 10-10 mbar or higher pressures of 10-2 mbar, all users will want the most accurate reading possible. The electrical output of a vacuum pressure transducer is 0 VDC at 0 PSIV (14.7 PSIA) and full scale output (typically 5 VDC) at full scale vacuum, 14.7 (0 PSIA). 6 Powers of 10. It is referred to as pounds per square inch (vacuum) or PSIV. However, there is no universal vacuum gauge that will respond accurately throughout the range from atmospheric pressure to 10-12 mbar. If, for example, the negative port is connected to a vacuum and the + port open to atmosphere, the transducer signal will increase as the vacuum increases. Like torr, this is an absolute pressure scale where 0 is zero atmospheric pressure and 1,013 mbar (a) is the standard for atmospheric pressure.


Therefore, 500 mbar equates to 380 Torr.

4) Torr, and standard atmospheric pressure = 760 Torr, and for smaller measurements. 5) MilliTorr or mTorr, where 1 mTorr = 1/1000 of 1 Torr. Vacuum pressure is measured relative to ambient atmospheric pressure. Vacuum gauge is measured from ambient air pressure in the negative direction.

This now gives us vacuum measuring units: Fig.
Vacuum absolute is measured from a perfect vacuum in the positive direction. This unit is easily converted to torr simply by multiplying by 0.760. So for example at ambient air pressure the vacuum reading is 0 bar gauge and if a suction pressure of 0.25 bar is applied, the vacuum reading will be -0.25 bar gauge.


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