Basic Electronics and Electrical Engineering: Chapter 8: Sensors and Transducers
Liquid Level Sensors
Liquid flow is generally measured by applying the Bernoulli's principle of fluid flow through a constriction.
LIQUID
LEVEL
Liquid flow is generally
measured by applying the Bernoulli's principle of fluid flow through a
constriction. The quantity of fluid flow is computed by using the pressure drop
measured. The fluid flow volume is proportional to square root of pressure
difference at the two ends of the constriction. There are various types of
fluid flow measurement devices being used in manufacturing automation such as
Orifice plate, Turbine meter etc.
Orifice plate
Turbine meter
Turbine flow meter has
an accuracy of 0.3%. It has a multi blade rotor mounted centrally in the pipe
along which the flow is to be measured. Figure 8.37 shows the typical
arrangement of the rotor and a magnetic pick up coil. The fluid flow rotates
the rotor. Accordingly the magnetic pick up coil counts the number of magnetic
pulses generated due to the distortion of magnetic field by the rotor blades.
The angular velocity is proportional to the number of pulses and fluid flow is
proportional to angular velocity.
Basic Electronics and Electrical Engineering: Chapter 8: Sensors and Transducers : Tag: : - Liquid Level Sensors
Basic Electronics and Electrical Engineering: Chapter 8: Sensors and Transducers
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