Dear experts, into how many categories are temperature measuring instruments generally divided?
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If you know, please let me know. Thank you in advance!
By energy source, the common types are pneumatic and electric; by measuring element, there are resistive types, thermocouples, etc., while for non-electrical quantities, there are pressure types, bimetallic types, etc； Present tenses are distinguished between regular and intelligent ones.
Thermocouples and thermal resistors: thermocouples are used to measure high temperatures, while thermal resistors are used to measure low temperatures
1. Gas thermometer 2. Resistance thermometer 3. Thermocouple thermometer 4. High-temperature thermometer 5. Pointer thermometer 6. Glass tube thermometer 7. Pressure-type thermometer 8. Thermocouple temperature meter 9. Optical temperature meter 10. LCD thermometer
It is divided into contact and non-contact types. Contact type -- glass liquid, bimetal, pressure, resistance, thermocouple. Contactless -- optics, radiation.