how to check pt100 with multimeter

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If you’re looking for a quick and easy way to check pt100 with a multimeter, you’ve come to the right place! In this blog post, we’ll show you how to do just that.


A PT100 is a resistance-temperature detector (RTD) that consists of a length of fine wire wrapped around a ceramic or glass core. The element is usually in the form of a coil, and the whole assembly is often enclosed in a metal tube for protection. The RTD measures temperature by monitoring the change in resistance of the element as temperature changes. A multimeter can be used to check the resistance of the PT100 and to convert the resistance into temperature units.

What is a PT100?

A PT100 is a type of resistance thermometer, often used in laboratory and industrial settings. It is made from a platinum wire that is coiled around a ceramic or glass rod. The wire is usually about 0.5 mm in diameter, and the rod is about 1 mm in diameter. The PT100 is placed in contact with the object whose temperature is to be measured, and the resistance of the wire changes with temperature. This change in resistance can then be used to calculate the temperature of the object.

What is a multimeter?

A multimeter is a device that can measure multiple electrical properties, including voltage, current, and resistance. Multimeters can also be used to test continuity and to measure capacitance.

How to check a PT100 with a multimeter

If you need to check a PT100 temperature sensor with a multimeter, you can do so by using the resistance function on the multimeter. First, make sure that the multimeter is set to the resistance function. Then, touch the probes of the multimeter to the PT100 sensor leads. The resistance reading on the multimeter will give you an indication of the PT100’s temperature.

Why check a PT100 with a multimeter?

Reasons you might want to check a PT100 with a multimeter include:

-To check if the PT100 is working
-To find out how accurate the PT100 is
-To find out if the PT100 is responding correctly to changes in temperature
-To calibrate the PT100

There are two main ways to check a PT100 with a multimeter: by measuring resistance, or by using a function designed specifically for checking thermocouples. Measuring resistance can give you an indication of whether the PT100 is functioning, but it won’t tell you how accurate it is. Using the thermocouple function will give you a more accurate reading, but it’s only available on some multimeters.

Tips for checking PT100s with a multimeter

When checking the temperature resistance of a PT100 with a multimeter, it is important to keep the following in mind:

– The resistance of the PT100 at 0°C should be 100 Ω.
– The resistance of the PT100 at 100°C should be 138.4 Ω.
– The resistance of the PT100 at 20°C should be between 93.3 Ω and 96.7 Ω.
– Most PT100s have a tolerance of ±0.5%. This means that the resistance of a PT100 at 20°C could be between 92.85 Ω and 97.15 Ω, and still be within tolerance.


In conclusion, checking a PT100 with a multimeter is a quick and easy way to test the sensor. By using the two-wire method, you can test the sensor without having to remove it from the application.


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