Answer
Dec 28, 2023 - 01:10 PM
Most thermocouples follow a well defined temperature vs. voltage curve. The curve they follow is dependent on the thermocouple type. For example all K(chromel/alumel) thermocouples should follow the same curve regardless of the manufacturer The curves for most common thermocouples is published by the National Institute of Standards and Technology(N.I.S.T). You can find the data here.... https://srdata.nist.gov/its90/main/
However, thermocouples are non-linearized and produce a very low level millivolt/microvolt output. They also require a calculation called cold junction compensation which adjusts the measurement for the ambient temperature at the point the voltage measurement is made. Because complexity of making a thermocouple measurement of we always suggest using a device that is designed to measure thermocouples. There are many of these devices on the market. If, however, you do want to use a general purpose voltage measurement device to measure thermocouples it can be done with some extra effort. IOthrifty has published a blog "How to Convert Thermocouple Voltage to Temperature? (or how to measure temperature with a thermocouple and multimeter)" which goes into the process in more detail. You can see the blog here.. https://www.iothrifty.com/blogs/news/...
However, thermocouples are non-linearized and produce a very low level millivolt/microvolt output. They also require a calculation called cold junction compensation which adjusts the measurement for the ambient temperature at the point the voltage measurement is made. Because complexity of making a thermocouple measurement of we always suggest using a device that is designed to measure thermocouples. There are many of these devices on the market. If, however, you do want to use a general purpose voltage measurement device to measure thermocouples it can be done with some extra effort. IOthrifty has published a blog "How to Convert Thermocouple Voltage to Temperature? (or how to measure temperature with a thermocouple and multimeter)" which goes into the process in more detail. You can see the blog here.. https://www.iothrifty.com/blogs/news/...
