TRANSDUCER• A transducer is a device that converts one form of energy to another
Some typical Sensors and TransducersThermistors Ambient Light Sensor Thermocouple
Some Typical Transducers LVDTs RTDs Thermowel
ON THE BASIS OF SIGNALSAnalog Digital • An Analog instrument gives an • A digital instrument has an output which varies output which varies in discrete continuously as the quantity steps and so can only have a being measured changes finite number of values
ON THE BASIS OF POWER CONSUMPTIONACTIVE PASSIVE• External power source is • No external power source is needed required
ON THE BASIS OF OPERATIONAutomatic Manual• An auxiliary device is present. • Need an operator.• Fast dynamic response. • Poor dynamic response.• Lower operating cost. • Operation cost is higher.
On the Basis of display of resultDeflection Null• Simple in construction and • Manual operation. operation. • Poor dynamic response.• Good dynamic response.
On the Basis of contactContacting Non contacting• Instrument is present in the • Not in direct contact with the medium itself. measuring medium.• Eg. Clinical thermometer. • Eg. Optical pyrometers.