Question: Compare the temperature transducers - RTD, thermistors, and thermocouples on the basis of principle, characteristics, ranges, and applications.
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Mumbai University > Electronics Engineering > Sem3 > Electronic Instruments and Measurements

Marks: 10M

Year: June 2014

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modified 3.3 years ago  • written 3.3 years ago by gravatar for Ramnath Ramnath3.8k
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Sr. No. Parameters RTD Thermistor Thermocouple
1 Working principle They are sensors that measure temperature by correlating the resistance of the RTD element with temperature They are a type of resistor with an electrical resistance that possesses either a negative or positive temperature coefficient of resistivity A thermocouple consists of two dissimilar metals, joined together at one end. When the junction of the two metals is cooled or heated a voltage is produced that can be correlated back to the temperature (Seebeck effect)
2 Temperature Range -240°C to 649°C -100°C to 500°C -267°C to 2316°C
3 Accuracy Best Good Bad
4 Linearity Best Good Better
5 Sensitivity Better Best Good
6 Cost Slightly expensive Economical Very cheap
7 Interchangeability Excellent OK Good
8 Repeatability Excellent Fair Poor
9 Self-Heating Low Yes No
10 Manufacturing Material Films or coils of metal such as platinum Ceramic material semiconductors like cobalt, manganese, or nickel oxides coated in glass Created by welding two dissimilar materials like Iron-Constantan, Nicrosil-Nisil
11 Applications Air conditioning, plastic processing, microelectronics, exhaust gas temperature measurement, etc. Potential divider networks, temperature compensation, circuit protection, volume control, etc. Kiln temperature measurement, rocket engines, fog machines, etc.
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modified 3.3 years ago  • written 3.3 years ago by gravatar for Ramnath Ramnath3.8k
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