What does the graduation number mean for thermocouples and temperature measuring instruments?

The graduation mark represents the temperature range, and each graduation mark represents the specific temperature output of the thermocouple and the voltage output in volts or millivolts.

The thermal resistance scale table refers to a table that represents the scale characteristics of thermal resistance, that is, a resistance temperature comparison table. The code for the thermistor scale is abbreviated as the scale number. Thermistors with the same division number should comply with the provisions of the corresponding division table.

Only standardized thermocouples have thermocouple indexing numbers, so the letter symbol for thermocouple types also becomes the indexing number and the code for thermocouple indexing tables. The thermocouple calibration table refers to a table that represents the relationship between thermoelectric potential and measured temperature under the condition that the reference end of the thermocouple is 0 ℃. Thermocouples with the same calibration number can share the same calibration table.

Additional Information:

The basic principle of measuring temperature with a thermocouple is the thermoelectric effect, and a secondary meter is a voltmeter or an electronic potentiometer used to improve accuracy.

The division marks of thermocouples mainly include S, R, B, N, K, E, J, T, etc. Among them, S, R, and B belong to precious metal thermocouples, while N, K, E, J, and T belong to low-cost metal thermocouples.

Thermistor is a commonly used temperature detector in the medium and low temperature range. Its main features are high measurement accuracy and stable performance. The measurement accuracy of platinum resistance thermometer is very high, and it is not only widely used in industrial temperature measurement, but also made into a standard reference instrument. Thermistors are mostly made of pure metal materials, with platinum and copper currently being widely used. In addition, materials such as nickel, manganese, and rhodium have begun to be used to manufacture thermistors.