0

10kviews

Compare the temperature transducers - RTD, thermistors, and thermocouples on the basis of principle, characteristics, ranges, and applications.

written 9.5 years ago by teamques10 ★ 70k

•   modified 6.2 years ago

electronic instrumentation and measurement

ADD COMMENT FOLLOW SHARE EDIT

1 Answer

2

167views

written 9.5 years ago by teamques10 ★ 70k

Following is the comparison between the three temperature transducers:

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.

ADD COMMENT SHARE EDIT