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sensors
Definitions:
The devices that inform the control system about what is actually occurring are called sensors (also known as transducers). For example, we might measure fluid flow in a pipe with a flowmeter.
What is the difference between transducers and sensors?
-Sensors: convert a physical parameters into electrical signals.
-Transducers: convert an energy form into another energy form.

Types of sensors:
       Flow sensors:
i) Pressure based flow sensor.
ii) Magnetic flow meters.
iii) Turbine flow sensor.
       Position sensors:
i) Analogue:
a) Potentiometers.
b) Linear variable differential transformer.
ii) Digital:
a) Optical rotary encoders.
3.  Liquid sensors:
i) Discreet.
ii) Continues
4. Proximity sensors:
i) Limit switches.
ii) Optical proximity.
iii) Hall_Effectproximity.
4.  Pressure sensors:
i) Bourdon Tubes.
ii) Bellows.
iii) Semiconductor pressure sensor.

5.  Temperature sensors:
i) Bimetallic temperature sensor.
ii) Thermistors.
iii) Integrated circuit temperature sensors.
    iv) Resistance temperature detectors

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