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[SOLVED] How to use NTC temperature sensor in production

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c_mitra said:
Why so costly? The material is inexpensive and if you want to use it at temperatures above 1000C, you need some protection (the metals work well in reducing atmospheres but using in furnaces need special care).
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I do consider this as childish question, K type thermocouple it is a product with protective sleeve and plug, and any factory making them has expensive instrumentation and manufacturing process and materials which they are in accordance to metrology and international standards.

Any temperature above 200C this is a job for infrared technology sensor.
 

Lets start over with facts this time, MCU 16 Bit this is 1$ worth item, and finest NTC this worth 1.5$
If someone thinks about using such parts and getting results of instrumentation worth 3000$? then this person he is a dreamer ( And I am using a very polite expression).

I am tremendously expert industrial electrician, working with electronics for 35 years, but answers requested in this topic requiring a magician.
 

Any temperature above 200C this is a job for infrared technology sensor.
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Not generally. RTD sensors are good up to 500 °C, thermocouple sensors much more depending on the type. Although infrared is preferred for some applications, contact thermometers will achieve better accuracy in many cases.
 

FvM said:
Not generally. RTD sensors are good up to 500 °C, thermocouple sensors much more depending on the type. Although infrared is preferred for some applications, contact thermometers will achieve better accuracy in many cases.
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We can talk for days about generic facts, RTD is not famous for speed this is why foods refrigeration industry does not use them.
 

Kiriakos-GR said:
We can talk for days about generic facts, RTD is not famous for speed this is why foods refrigeration industry does not use them.
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Who said anything about "foods refrigeration industry"?

Basically, OP needs to specify: temperature range; required accuracy; required stability; cost constraints; speed (if that is, in fact, a requirement)
 

Any temperature above 200C this is a job for infrared technology sensor.
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I do not agree; a simple (or cheap) Pt resistance thermometer (say Pt100) can work happily up to 1000C.

AND infrared radiation thermometers (as others also have pointed out) are less accurate.

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Quoting from **broken link removed**

(and this is a very respectable site)

For the highest accuracy, special glass-sheathed standard PRTs, usually of 25 ohms at 0 °C, are calibrated at the fixed points of the International temperature scale 1990 (see above). The ITS-90 specifies equations to relate the resistance to temperature and, using these, uncertainties can be achieved of 0.001 °C or better. Standard PRTs can be used from temperatures as low as 259 °C up to 660 ºC, or even, 962 ºC, with some increase in uncertainty and of loss of reproducibility.
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