In the compensation wires of thermocouples: what is the difference between extended type and compensation type?
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In the compensation wires of thermocouples: what is the difference between extended type and compensation type?
The material of the extended compensation wire is basically the same as that of the thermocouple wire, and it is commonly used in inexpensive metal thermocouples such as K-type and E-type. The material used for compensation wires differs from that of the thermocouple wire, and it is often used in thermocouples made of precious metals such as R-type, B-type, and S-type.
Thermocouple extension compensation wires are made of the same material as the thermocouples, and are used for base-metal thermocouples. Compensation wires of the thermocouple-compensation type are made from materials that exhibit T-E characteristics very similar to those of thermocouples within a certain temperature range. It is mainly used for thermocouple temperature measurement of precious metals.
It’s to eliminate errors, I’m not quite sure
Extended compensation wire – its alloy wire has the same nominal chemical composition and thermoelectric potential value as those of the thermocouple wire it is used with; the letter “X” is added after the thermocouple designation to indicate this, such as “EX”. Compensating compensation wires – whose alloy wires have a nominal chemical composition different from that of the thermocouple wire they are used with – still exhibit a thermoelectric potential that is identical to the nominal value of the thermoelectric potential of the associated thermocouple at temperatures of 0-100 degrees or 0-200 degrees. They are indicated by the letter “C” appended after the thermocouple’s designation, such as “KC”, etc.
Thermocouple extension compensation wires are made of the same material as the thermocouples. Thermocouple-compensated compensation wires are made of materials that exhibit T-E characteristics very similar to those of thermocouples within a certain temperature range. Therefore, thermocouples made of more expensive metals do not come with extended compensation wires, and even if they do, they are too expensive to use ； Thermocouples made of cheap metals lack compensating wires, so they are not worth researching and developing.