How to use a multimeter to check K type thermocouple temperature

Thermocouple reference table How to read a

so what exactly is a thermocouple reference table, how you read it? If you study a certain stage in the degree of the heat transfer, then you'll know what I'm talking about. If you don't, then I will catch you.

reference table to tell you a pressure or temperature of the material properties. Thermocouple chart work the same way. Don't worry about it. Thermocouple table is easier to read than many other thermodynamic!

in this article, we will show you how to use a multimeter to check the thermocouple temperature. To this end, we will use an example, the use of K type thermocouple table.

before you start using a multimeter to pull out of the thermocouple voltage and check the voltage to before temperature conversion table, you should know some concepts. When you expand thermocouple, you will always see nodes as zero degrees Celsius ( 0° C) 。 What's that supposed to mean? This means that you do not have the extra voltage, because 0 & deg; C is equal to zero millivolts ( 0 mV） , right? Not at all.

in fact, what do you usually do in the cold junction has a higher temperature. So, if you don't compensate, then you will get the error value.

well, some people just want to, & other; I don't have a cold junction. Can I use voltmeter to check voltage directly! “ Don't say it again. When you connect the voltmeter, you will create a cold end! You need to read between the metal's law, also known as the law of thermocouple. Read table

ok, until the details. If you missed it before, you need a voltmeter or multimeter to check the thermocouple voltage. Next, you need to know that you have a thermocouple type. Last but not least, you need to check with thermocouple reference table.

ok, but the reference table is what kind of? Good question! Look, don't panic. I will teach you how to read it.

K type thermocouple reference table first, let's have a look at the K type thermocouple chart.

the first column (on the left Red) 10 as incremental display temperature. Well, if you have 14, so where did you find 14? Simple. First of all, on the left to find 10. And then slide to the right to find the above four columns ( The blue line) 。 Yes, it is 14 for you. It is suitable for 105,66,92, and so on.

yellow box number is the number in the mv. If you know the millivolt voltage, please find and according to the columns and rows in the table to find the temperature.

let me give you a simple example based on the K type thermocouple table. So you have 3. 474 mV。 Now scan the form, you will find the number in 80 rows and five columns. This makes 85 & deg; C Tada！

cold junction compensation well, suppose your environment temperature is 24 & deg; C, and use the voltmeter to check K type thermocouple. How did you find your temperature?

first of all, remember that the cold end. Here is 24 & deg; C。 Check if the thermocouple reference table, you'll see 24 & deg; C, 0。 The value of 960 mV. Now you have the Numbers, do some simple mathematical operations.

so let's say voltmeter 4 to you. 409 mV。 Only need to add the number to you to find the value of the environment temperature, you should get 5. 369 mV。