How to Check a Temperature Sensor with a Multimeter

This site contains affiliate links to products. We may receive a commission for purchases made through these links.

For many electronics projects, the temperature is as important a part as anything else. Whether we’re making ice cream, defrosting a freezer, heating up a toaster oven, or doing something as simple as keeping track of indoor/outdoor temperature, we need to know the temperature. Also, any time you have a heating or cooling system, you want to make sure that the temperature is accurate. You can check a temperature sensor in a few simple steps using a multimeter.

x
How to Use a Soldering Iron

Checking the Temperature Sensor

If you’re struggling to get accurate temperature readings from a sensor, it’s probably because your sensor is faulty. This technique will show you how to check your temperature sensor with a multimeter to determine whether it’s faulty. Of course, if your sensor is still faulty after this test, you will need to replace it.

  1. Put your multimeter in its resistance mode. To do this, you hold the mode button until you see “res” on display. 
  2. Place one of the probes on the temperature sensor and one on the negative side of the power source. 
  3. If the temperature sensor is working, you should read a resistance between the two probes. If you do not read a resistance, the temperature sensor may be malfunctioning.

With the help of the multimeter, checking the temperature sensor is really easy, but it’s important not to damage the sensor or the multimeter. Since there are different kinds of temperature sensors, a multimeter can be used to determine whether the temperature is rising or falling. If the temperature rises, then the multimeter should read a positive voltage. If the temperature falls, the multimeter should read a negative voltage.

What Is A Temperature Sensor?

In short, it’s a sensor that measures temperature. They can be used for various purposes like keeping your computer from overheating, making sure the water coming out of your shower is warm enough, or helping diagnose problems with your car. They can even be used in medical devices to check your body temperature. This device is used for a great many things, including controlling the temperature inside a home or building, measuring the temperature of the environment where the device is located, and much more. 

The most common temperature sensors used in electronics are thermistors since they are accurate and have a wide range of working temperatures. They can be purchased as part of an electronic component or can be built into a circuit. (It’s important to note that there are other temperature sensors, but we aren’t going to cover those in this article.) Since thermistors are used in many applications, they are often built into circuits as part of a larger system.

Things to consider when checking this sensor

When checking temperature sensors, you should always check the following: 

  • Is the sensor calibrated?
  • Is the sensor in the correct environmental conditions? 
  • Is the sensor exposed to external interference? 
  • Does the sensor have a known history of failure?
  • Is the sensor placed correctly? 

If you can answer yes to all of the above, you can be assured that the temperature reading is correct. Also, when checking temperature sensors, it’s important to take into account the environment they operate in. For example, if a temperature sensor is located near a heat source, the temperature reading will be inaccurate. 

On the other hand, if a temperature sensor is located near an area that is not getting much airflow, the temperature reading will be inaccurate since a sensor that is not being exposed to air will be reading a higher temperature than what the object being read is actually at.

General Types of Temperature Sensors

Temperature sensors come in three general types with a wide variety of different sensors within each category: thermocouples, which measure the temperature difference between two points; thermistors, which are more accurate than thermocouples; and RTDs, which are the most accurate of all. Thermocouples are the most widely used temperature sensors, thanks to their low cost, and they generally come in four possible configurations: J, K, T, and E (just like resistors).

Are Temperature Sensors Important?

Temperature is one of the most important parameters of any device. Be it a battery, an oven, or a cell phone, the temperature is a critical factor in its performance. But how important is it? We’ll start off by asking a question: can you enjoy the taste of your food if it’s been burnt or frozen? The same logic applies to electronics and circuits. If the temperature of the circuit components is not within the specified range, the circuit will not work the way it is supposed to.

Temperature sensors are an important tool for reading the temperature in many applications. They can be used for hobby projects, in science and math classrooms, or in industrial settings. The multimeter, or “multimeter” as it’s also known, is an electronic instrument used for measuring current flow, voltage, and resistance. When it comes to temperature sensors, you can get general ones, or you can get specific ones designed for a certain application, such as measuring the temperature of a meat thermometer.

When It is About Replacement

With the number of things that need to be kept cool or warm going up every day, the need for temperature sensors is also increasing. Whether you’re building a thermostat, an air conditioner, or an all-in-one oven, you can’t afford to do without these little devices. Although there are many different types of temperature sensors, they all do basically the same thing: send a signal to your microcontroller when something is too hot or too cold.

Many important processes in nature depend on the temperature. The cooling of the room air to the heat from the fire to different engine processes requires a temperature sensor. As the temperature sensor is an important element that determines whether the process will be successful or not, it is necessary to select the best one.

Special offer for our visitors

Get your Soldering Iron Guide For DIYERS

We will never send you spam. By signing up for this you agree with our privacy policy and to receive regular updates via email in regards to industry news and promotions