Transducer Type

Passive Transducers is require external power,producing a variation in
Some electrical parameter which can be measured as a voltage or
current variation.

Resistance Transducer Type
- potentionmetric
operation = position of slider by external force varies the resistance in a
potentiometer or bridge circuit
- resistance strain gage
operation = resistance of a wire or semiconductor is change by compression
due to external appile stress
- pirani gage
operation = resistance of a heating element is varied by convection colling of
gas
- thermometer
operation = resistance of pure metal wire with a large positive temperature
coefficient of resistance varies with temperature.
- thermistor
operation = resistance of certain metal oxides with negative temperature
coefficient of resistance varies with temperature.
- hygrometer
operation = resistance of a conductive strip change with moisture content
- photoconductive cell
operation = resistance of the cell as a circuit element varies with incident