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Presented by;Bilal Sarfraz Suffian ButtHafiz AamirFloat Transducer

Float Transducer

SensingSensor is a device that receives and responds to a signal or stimulus; the portion of a measurement system that responds directly to the physical variable being measured.Transducer converts the physical variable into alternative form (commonly electrical voltage)

Classification of SensorsDiscrete-Event Sensors:Mechanical limit switchesProximity switchesPhotoelectric sensorsContinuous Sensors:Linear position transducers: The simplest form is a linear potentiometer, where the position of the slider is proportional to the output voltage.

Cont..2)Continuous Sensors:Rotary (angluar) transducers: Rotary potentiometers sense angle in a way analogous to linear potentiometers.Float Transducers: A float transducer uses a rotary potentiometer to produce a voltage proportional to the angle of an arm with a float attached.3) Scene Sensors

Introduction to Float TransducerContinuous level indication and monitoring of all types of liquidsThey are particularly reliableThe analogue controllers have an electrical output signal with adjustable relay contacts for level monitoring or integrated indicating devices for level indication.

Float TransducerIt is not influenced by conductivity, temperature, pressure and viscosityFunction Principle: The transducer comprises a measuring tube on which a float, fitted with a magnet, switches the reed contacts mounted in a tube in a non-contacting fashion.

The measuring tube in the level sensors is equipped with a chain of resisters and reed contacts. The float activates the sealed contacts through the wall of the measuring tube, whereby a measuring circuit voltage proportional to the level is picked off at the resistance measuring chain.This sensing technique is similar to the operation of a sliding contact on a resistance potentiometerThe voltage sampled from the chain of the resistors is transferred to a transmitter which outputs a current proportional to the liquid levelFloat TransducerWhy we need modification?

A Modern Design of an Electronic Float Transducer ConstructionCylindrical (or spherical) floatflow sensing tubetwo metallic plates solid rodmetallic ribbon Tank

Working Insulating materialelectrical contact contact with the liquidnon corrosive counter weight sufficient lengthdielectric medium

Thus the level sensor has an easy automated industrial application since its principle of operation and design is very simple compared to the conventional float transmitters.

ApplicationsWater reservoirsWaste water and clarification plantsFeed and batching tanksDrinking water tanksChemical tanksRivers, canals

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