Classify the temperature measuring transducers.

Classify the temperature measuring transducers. 
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Answer :

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1.Expansion thermometers:  Bimetallic thermometers Bimetal Helix Thermometer Spiral Bimetallic thermometers 

2. Filled system thermometers:  Liquid filled thermometers Gas filled thermometers Vapour pressure thermometers 

3. Electrical Temperature Instruments:  RTD Thermistors Thermocouples 

4. Pyrometers:  Radiation Pyrometers Infrared Pyrometers Optical Pyrometers

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Thermistor with high negative temperature coefficient are very accurate for measuring low temperature especially near is a. 10 K b. 70K c. 200K d. 35K

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