Ionization gauge | Wikipedia audio article
Channel: wikipedia tts
Date: 04/10/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Pressure_measurement


00:01:33 1 Absolute, gauge and differential pressures — zero reference
00:06:55 2 Units
00:11:50 3 Static and dynamic pressure
00:13:18 3.1 Applications
00:13:36 4 Instruments
00:14:16 4.1 Hydrostatic
00:14:46 4.1.1 Piston
00:15:10 4.1.2 Liquid column (manometer)
00:16:01 4.1.3 McLeod gauge
00:19:36 4.2 Aneroid
00:20:56 4.2.1 Bourdon gauge
00:22:21 4.2.1.1 Mechanical details
00:26:57 4.2.2 Diaphragm
00:28:42 4.2.3 Bellows
00:29:53 4.2.4 Magnetic coupling
00:30:56 4.3 Spinning-rotor gauge
00:31:30 5 Electronic pressure instruments
00:32:40 5.1 Thermal conductivity
00:37:02 5.1.1 Pirani (one wire)
00:37:58 5.1.2 Two-wire
00:38:40 5.2 Ionization gauge
00:39:06 5.2.1 Hot cathode
00:41:33 5.2.2 Cold cathode
00:44:35 6 Dynamic transients
00:46:15 7 Calibration and standards
00:47:13 8 History
00:49:04 9 European (CEN) Standard
00:49:13 10 US ASME Standards
00:49:59 11 See also



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SUMMARY
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Pressure measurement is the analysis of an applied force by a fluid (liquid or gas) on a surface. Pressure is typically measured in units of force per unit of surface area. Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure and display pressure in an integral unit are called pressure meters or pressure gauges or vacuum gauges. A manometer is a good example, as it uses the surface area and weight of a column of liquid to both measure and indicate pressure. Likewise the widely used Bourdon gauge is a mechanical device, which both measures and indicates and is probably the best known type of gauge. 
A vacuum gauge is a pressure gauge used to measure pressures lower than the ambient atmospheric pressure, which is set as the zero point, in negative values (e.g.: −15 psig or −760 mmHg equals total vacuum). Most gauges measure pressure relative to atmospheric pressure as the zero point, so this form of reading is simply referred to as "gauge pressure". However, anything greater than total vacuum is technically a form of pressure. For very accurate readings, especially at very low pressures, a gauge that uses total vacuum as the zero point may be used, giving pressure readings in an absolute scale.
Other methods of pressure measurement involve sensors that can transmit the pressure reading to a remote indicator or control system (telemetry).