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Chapter 5: Pressure Measurement - Coggle Diagram
Chapter 5: Pressure Measurement
Pressure means force per unit area (P=F/A)
medium/moderate pressure
Manometer
Manometer is the simplest device for measuring static pressure.
Characteristic
non-corrosive and not have any chemical reaction with the fluid which pressure is being measured
low viscosity to ensure quick respond to pressure changes
should have negligible surface tension and capilary effect
Other type of manometer
cistern manometer
Movable tube type micromanomeer
inclined tube manometer
Micrometer type manometer
micromanometer with motor drive and digital read-out
Bourdon tube
elastic elements are as follow
Diaphragm
Bellows
Corrugated diapragm
capsule
Bourdon tube
Helical tube
Common been used to measure pressure.
main element: elastic bourdon tube
measured by amplified
Low pressure (vacuum) measurement
represent by unit Torr and micron. One Toor is a pressure equivalent of 1 mm of hg while 1 micron is 10^-3 Torr
Types of vacuum gauges
McLeod Gauge
Thermal Conductivity Gauge or Pirani Gauge
Lonisation gauge
Knudsen Gauge
High pressure measuremnet High-wire pressure transducer
Special techniques have to used for measure the pressure above 1000 atm
The coil is enclosed is a flexible bellows, filled with kerosene. changes in resistance of wire between A and B is measured by usual methods like Wheatsone bridge
LVDT
