Choosing an Infrared Thermometer

There are many things to consider when choosing an infrared thermometer. Here are some things to consider: Handheld vs. fixed, Field of view, Accuracy and Calibration. If you’re unsure what type of thermometer to purchase, consider these points. These tips will help you choose the best-infrared thermometer for your needs. Once you know what to look for, you’ll be on your way to measuring everything from hot coffee to ice cream! Discover this info here.

Handheld vs. fixed

infrared thermometerIf you’re wondering which type of infrared thermometer is more accurate, you might want to consider a handheld model. Handheld models typically have a lower emissivity than their fixed counterparts, so they can be used for measuring a wide variety of everyday materials. The Optris MS, a good example of a cheap handheld model, requires you to aim the device at an object, press a trigger, and display the results instantly. However, this model has limited features, so it’s best for easy use.

The primary difference between handheld and fixed infrared thermometers is the D:S ratio. Fixed-mount sensors can measure larger areas, but handheld thermometers are generally designed for close-range measurements. Therefore, when purchasing an infrared thermometer, consider how far you plan to use it and the size of the target. The larger the target, the higher the D:S ratio.

Field of view

The field of view of an infrared thermometer is the size of the visible area it can see at a given distance. The distance to spot ratio, or D:S ratio, is directly related to the sophistication of the optical system within the device. For an accurate reading, the FOV of an infrared thermometer should be smaller than the target’s size. If the FOV is too large, the device will measure the target’s temperature and the background’s temperature.

IR thermometers are non-contact devices that do not touch the target to obtain a temperature reading. Instead, the sensor measures the average temperature across the FOV during the sensor’s response time. Discover this info here. Because the sensor is non-contact, flatness is not an issue. This type of thermometer can be useful for various purposes, including monitoring the temperature of small objects. However, if the target is large enough, the D:S ratio will be higher.


The Accuracy of Infrared Thermometers varies depending on the temperature measurement it is used for. The accuracy of an IR thermometer is dependent on several factors, including the emissivity of the object that is being measured. Emissions of infrared energy are measured by the thermometer’s emissivity, which should be 0.95 to 0.97.

To ensure the accuracy of an infrared thermometer is not affected by the environment around the measuring area, the infrared thermometer should be left in the measurement area for at least five minutes. Once the temperature has been measured, the measurement personnel should remain in the room for about the same time. Three repeated measurements should be considered an accurate measurement. Once these steps have been completed, the infrared thermometer is ready for use in the kitchen.


Infrared tympanic thermometers are widely used for the measurement of human body temperature. Therefore, accuracy is an important performance metric for infrared tympanic thermometers. The Braun THT-3020 was calibrated against an OMRON MC-510 by modifying a cell for a blackbody reference standard. The predictive values achieved could meet the ASTM standard. Sources of uncertainty in the calibration process are replication at a fixed temperature, reference standards, and resolution.

For IR thermometer calibration, a blackbody source is used. The blackbody source contains an opening to view the heated surface or cavity. Infrared thermometers come in two types: Hot Plate Blackbody and Cavity Type Blackbody. For best results, a Cavity Type Blackbody is recommended. Its emissivity is higher than that of a hot plate.


Infrared thermometers work by detecting the heat emitted by the human body. They have a gun-like shape and are portable. The disadvantage is that they don’t use the same technique to measure the temperature of a room. Nevertheless, they are useful and practical. The primary advantage of infrared thermometers is their safety. They don’t cause radiation, but they pose a risk to the user’s eyesight. Discover this info here.