Grade classification of temperature
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Thermocouples are classified into standard groups, first class, second class, Class I, and Class II, while thermal resistors are divided into working references, standards, working types, precision measurement grades, first class, second class, Class A, Class B, and so on. Personally, I find it a bit complicated. Why can’t there be a unified classification for thermometers, such as Level 1, Level 2, Level 3, Level 4?
It’s really easy to get confused! It’s been played with great detail!
The origin is unknown; I think it was simply copied from the IEC standards. If someone says it’s grade 1, then it’s grade 1; if they say it’s grade A, then it’s grade A.
I’m not sure about this. Is it possible to use a PT100 resistor to measure temperatures above 500 degrees for long-term measurements?
For temperatures above 500 degrees, how long should testing be conducted on a long-term basis? I actually have a PT100 sensor that is rated for 600°C, but when used at temperatures above 550°C for an extended period, I think drift will occur after 1000 hours, and its accuracy will gradually decrease. Also, according to the IEC60751 standard, Class A accuracy ranges from -30 to 300; Class B covers the range from -50 to 500. Above 500, Class C accuracy can be guaranteed at most. It seems that if a thermal resistor isn’t necessary, a thermocouple would be a better choice, as the temperature range above 500°C is beyond the range where K-type thermocouples may experience inaccurate drift.
Temperatures above 500°. Should long-term measurements be taken or not use a thermal resistor? It breaks easily, I guess it’s the thermocouple