How to Check Accuracy of Infrared Thermometers

How to Check Accuracy of Infrared Thermometer

Do you know the How to Check Accuracy of Infrared Thermometer of an infrared thermometer is often checked to employ a comparative. of an infrared thermometer is often checked to employ a comparative at any stable temperature.

However, to scale back the likelihood of a difference in temperature between the within the surface and therefore the base test hole, it’s more accurate at 22°C, ambient temperature.

How to Check Accuracy of Infrared Thermometer

What is Infrared Thermometer

An infrared thermometer is a device that can measure the temperature of an object or surface without physically touching it. It works by detecting and measuring the infrared radiation emitted by the object or surface, and then converting this radiation into an electrical signal that can be interpreted as a temperature reading.

Infrared thermometers are commonly used in a variety of settings, such as in the food industry to check the temperature of cooking surfaces and in the medical field to measure body temperature. They are also used in industrial settings to monitor the temperature of machinery and equipment, and in HVAC (heating, ventilation, and air conditioning) systems to monitor the temperature of air ducts and other components. In general, infrared thermometers are a convenient and non-invasive way to measure temperature quickly and accurately.

How to Check Accuracy of Infrared Thermometer

Infrared thermometers have gained much popularity due to their non-contact and non-invasive nature. They are widely used for measuring body temperature, especially during increasing health concerns. However, it is crucial to ensure the accuracy of an infrared thermometer to obtain reliable results. Here are some steps to help you check the accuracy of an infrared thermometer:

1. Start with a baseline: To determine if your infrared thermometer is accurate, you first need a reference temperature to compare with. Start by using a traditional mercury or digital thermometer to gauge the temperature of an object or person. Ensure the object or person is in the same environment and conditions as when using the infrared thermometer.

2. Understand the target distance and emissivity: Both the target distance and emissivity can affect the accuracy of an infrared thermometer. Ensure that you follow the recommended distance specified by the manufacturer. Additionally, adjust the emissivity settings based on the object being measured. Different materials have different emissivity values; changing this setting will help improve accuracy.

3. Check for temperature uniformity: Before measuring, ensure that the object or person being measured is at a consistent temperature. For example, if measuring body temperature, ensure the person has not consumed hot or cold beverages within the last few minutes. This provides a more accurate reading, as temperature fluctuations can impact the infrared thermometer’s accuracy.

4. Perform multiple measurements: To increase the reliability of your measurements, perform multiple readings using both the infrared thermometer and the reference thermometer. Take at least three to five measurements using each device and compare the results. The accuracy should be questioned if there is a significant difference between the infrared thermometer and the reference thermometer.

5. Calibration: Many infrared thermometers come with a calibration feature or can be calibrated by the manufacturer. It is essential to calibrate your infrared thermometer regularly, mainly if it is used for critical applications. Calibration ensures that the readings are accurate and reliable.

6. Test with known temperatures: If you have access to objects of known temperatures, you can further validate the accuracy of your infrared thermometer. For example, you can use an ice bath with a constant temperature of 0 degrees Celsius or boiling water at 100 degrees Celsius. Measure the temperature of these objects using your infrared thermometer and compare them with the known temperature values.

7. Consult the manufacturer: If you still need clarification about the accuracy of your infrared thermometer, it is best to reach out to the manufacturer. They can guide you on conducting accuracy checks specific to their product and answer any questions you may have.

8. Regular maintenance and updates: Infrared thermometers require regular maintenance and updates like any other device. Follow the manufacturer’s instructions regarding battery replacement, cleaning, and firmware updates to ensure optimal accuracy and performance.

Remember, while infrared thermometers are highly convenient and efficient, they may occasionally require calibration or accuracy checks to maintain reliability. By following these steps, you can ensure that the readings from your infrared thermometer are accurate and trustworthy, providing you with peace of mind, especially in critical applications such as monitoring human body temperature.

Using an Infrared Thermometer to Measure Human Body Temperature

Many IR thermometers designed for human fever scanning have entered the market to deal with the COVID-19 need but sadly, a number of the essential information that you simply need so as to choose a thermometer or assess its reliability isn’t easily available.

I went online and checked out a well-liked thermometer and therefore the published information about it didn’t have any mention of wavelength, impassivity, or spot size, and people are important parameters that we’ll discuss after we address a couple of basics, like the way to choose an infrared thermometer.

There are two vital pieces that enter correctly measuring the temperature of the steel strip: selecting the proper steel infrared temperature sensor and ensuring it’s correctly calibrated.

If you’ve already been skilled in the method of choosing the proper pyrometer for your application, congratulations! You’re halfway there.

The next step is to check the accuracy of your infrared thermometer to make sure you’re getting the simplest possible measurements. So how can you test it? Try these three ways to calibrate your pyrometer.

1. Confirm Accuracy Using Another Trusted Pyrometer

For many applications, quite one pyrometer is employed to make sure accurate measurement. In this case, calibrating your pyrometer is simple.

By using both pyrometers to measure the same area of thermal energy, you’ll adjust the calibration of your new pyrometer to match the prevailing one.

It’s important to notice that if you select this method, you want to compare measurements with a trusted pyrometer.

If you’re unsure whether your existing pyrometer is producing accurate measurements, adjusting your new infrared thermometer to match will only end in two pyrometers that are repeatable and can’t necessarily be trusted for accuracy.

You should also confine in mind that it’s important to live an equivalent area with each pyrometer; different areas can and sometimes will have different temperature measurements, so measuring the same area is that the only thanks to ensure accuracy.

2. Confirm Accuracy Using a Blackbody

Black body calibrators are very useful for the calibration of infrared thermometers. A black body may be a theoretical “perfect emitter,” meaning it emits the utmost amount of infrared energy for any given temperature.

It is also a diffuse emitter, radiating an equivalent intensity of radiation altogether directions. While no perfect black body actually exists, the principle provides a robust basis for calibration.

A black body calibrator typically consists of an empty cavity with a little target opening. Inside, a conical or tube-shaped radiation source is embedded during a shower, furnace, or heat pipe.

This radiation source isn’t a true black body, but it’s close: typical laboratory sources emit radiation with 98% efficiency or higher. Because the impassivity of the black body may be a known value, it’s possible to accurately calibrate the pyrometer.

This is a typical method for infrared thermometer calibration; actually, most manufacturers calibrate their pyrometers with multiple blackbody calibrators before selling them. However, it is not always the simplest method.

Black body calibrators are often expensive and difficult to work, which makes them but ideal to be kept during steelworks. It is more common to get rid of the pyrometer from the mill and send it to a professional shop that already features a black body calibrator.

3. Confirm Accuracy with a Thermonuclear

A thermonuclear is another sort of instrument wont to measure temperature. This junction creates a voltage when there’s a change in temperature, and thermonuclear reference tables are then wont to interpret the voltage and calculate the temperature.

A somewhat accurate method of calibration with a thermonuclear involves simply measuring the temperature of an object with a trusted thermonuclear, then measuring it with the pyrometer.

Again, it’s important to live in an equivalent area with both tools to make sure accurate calibration.

When using this method, it’s important to remain in mind that thermoplastic, when used alone, aren’t as accurate as pyrometers. Thermoplastic are available in all different varieties and you regularly buy what you get cheaper thermoplastic often won’t read accurately right out of the box!

So, if you’re looking to verify a pyrometer’s accuracy with a thermonuclear, you furthermore may get to verify the accuracy of your thermonuclear.


Q. How do I test an infrared thermometer?

A. Ice Water Test: Fill a glass with ice and add just enough water to fill the holes between ice pieces. Allow the ice/water to rest for a moment or two.

Stirring a few times for uniformity. Hold the infrared thermometer directly over the highest of the ice/water at a distance of about 3″.

Q. How do you test if your thermometer is accurate?

A. Insert the thermometer stem at least an inch deep in the ice water without letting the stem touch the glass. Wait for the thermometer to register; this usually takes a minute or less. The thermometer is accurate if it registers 32° F or 0° C.

Q. How do I exploit an infrared thermometer on my forehead?

A. Aim the probe of the thermometer at the middle of the forehead and maintain a distance of but 1.18in(3cm) away. Do not touch the forehead directly. Gently press the measurement button [ ] to start measuring.

Q. Are infrared forehead thermometers accurate?

A. Research has shown that, when used correctly, infrared or no-contact thermometers are even as accurate as oral or rectal thermometers.


It’s important to use accurate, reliable pyrometers, but it’s even more important to pick the proper pyrometer for your specific applications.

We understand that a steel mill is a demanding environment that can make accurate temperature measurements difficult, which is why we want to help you learn how thoughtful wavelength selection can improve your process.

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