Flow sensor | Wikipedia audio article

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00:01:12 1 Units of measurement
00:02:59 1.1 Gas
00:04:04 1.2 Liquid
00:04:44 2 Primary flow element
00:05:38 3 Mechanical flowmeters
00:06:28 3.1 Piston meter/rotary piston
00:07:16 3.1.1 Oval gear meter
00:08:46 3.2 Gear meter
00:09:26 3.2.1 Helical gear
00:10:17 3.2.2 Nutating disk meter
00:11:11 3.3 Turbine flowmeter
00:13:51 3.4 Woltman meter
00:14:21 3.5 Single jet meter
00:14:45 3.6 Paddle wheel meter
00:16:25 3.7 Multiple jet meter
00:17:19 3.8 Pelton wheel
00:18:11 3.9 Current meter
00:19:05 4 Pressure-based meters
00:19:29 4.1 Venturi meter
00:20:17 4.2 Orifice plate
00:20:49 4.3 Dall tube
00:21:39 4.4 Pitot-tube
00:22:16 4.5 Multi-hole pressure probe
00:23:09 4.6 Cone meters
00:24:37 4.7 Linear resistance meters
00:25:42 5 Variable-area flowmeters
00:27:06 6 Optical flowmeters
00:29:48 7 Open-channel flow measurement
00:30:30 7.1 Level to flow
00:32:09 7.2 Area/velocity
00:33:18 7.3 Dye testing
00:33:39 7.4 Acoustic Doppler velocimetry
00:34:09 8 Thermal mass flowmeters
00:36:03 8.1 The MAF sensor
00:36:44 9 Vortex flowmeters
00:38:49 10 Sonar flow measurement
00:40:49 11 Electromagnetic, ultrasonic and Coriolis flowmeters
00:41:17 11.1 Magnetic flowmeters
00:42:21 11.2 Non-contact electromagnetic flowmeters
00:43:08 11.3 Ultrasonic flowmeters (Doppler, transit time)
00:48:09 11.4 Coriolis flowmeters
00:48:51 12 Laser Doppler flow measurement
00:50:38 13 Calibration
00:51:17 13.1 Transit time method
00:52:16 13.2 Tracer dilution method
00:53:16 14 See also



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SUMMARY
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Flow measurement is the quantification of bulk fluid movement. Flow can be measured in a variety of ways. The common types of flowmeters with industrial applications are listed below:

a) Obstruction type (differential pressure or variable area)
b) Inferential (turbine type)
c) Electromagnetic
d) Positive-displacement flowmeters, which accumulate a fixed volume of fluid and then count the number of times the volume is filled to measure flow.
e) Fluid dynamic (vortex shedding)
f) Anemometer
g) Ultrasonic
h) Mass flowmeter (Coriolis force).Flow measurement methods other than positive-displacement flowmeters rely on forces produced by the flowing stream as it overcomes a known constriction, to indirectly calculate flow. Flow may be measured by measuring the velocity of fluid over a known area. For very large flows, tracer methods may be used to deduce the flow rate from the change in concentration of a dye or radioisotope.