What are the important parameters for choosing an infrared thermometer
1. Convenience: Use an infrared thermometer to measure the temperature, the response time is short, and the temperature of the measured electricity can be quickly read. Moreover, the handheld infrared thermometer is solid, lightweight, easy to carry around, and easy to use.
2. Safety: Non-contact temperature measurement can be carried out in unsafe or areas where contact temperature measurement is difficult, and the target temperature can be read safely.
3. Accuracy: The infrared thermometer can quickly and accurately detect small changes in temperature within the measurement range, which plays an important role in equipment inspection, preventive maintenance.
But there are so many infrared thermometers on the market, what is the difference between them? How to choose? There are some key parameters that must be paid attention to.
(1) Temperature range
The temperature measurement range is actually the range of the infrared thermometer, and the range of different thermometers will be different. The temperature measurement range is generally -50~360°C, -30~380°C, -18~280°C, -32~450°C ℃, -32~650℃, -32~1050℃, etc. There is also a special range for measuring body temperature, which is generally 35~42.5℃, and the appropriate range should be selected according to the temperature range of the measured object.
(2) Measurement accuracy
The measurement accuracy is the only indicator to ensure the accuracy of the measurement, and it is also the key indicator to determine the performance of the infrared thermometer. Accuracy is usually represented by ±X°C or ±X%, the smaller the value, the higher the accuracy.
(3) Display resolution
The display resolution is the last digit of the temperature display, usually 0.1°C or 0.1°F.
(4) Optical resolution
The optical resolution is the ratio of the distance D between the thermometer to the target and the measurement spot diameter S, that is, the ratio of the distance to the spot diameter D;S, the larger the D:S, the greater the accurate temperature measurement distance. In order to obtain accurate temperature readings, the distance between the thermometer and the test target must be within the proper range. If the thermometer must be measured far away from the target due to environmental conditions, and a small target is to be measured, a thermometer with high optical resolution should be selected. The higher the distance factor ratio, the higher the cost of the infrared thermometer.
(5) Emissivity
All objects with a temperature higher than absolute zero are constantly emitting infrared radiation energy to the surrounding space. Emissivity is the ratio of the energy radiated by an object at a specific temperature to the energy emitted by an ideal radiator at the same temperature. It is used to measure the ability of an object to radiate or absorb energy. Different objects have different emissivity Rate. Some infrared thermometers have a fixed emissivity of 0.95, while others are adjustable. For example, UT300S can adjust the emissivity of the infrared thermometer according to the material of the measured object, which can better guarantee the measurement results. the accuracy.
(6) Response time
Response time is the time required for the infrared thermometer to reach 95% of the energy of the final reading, indicating the reaction speed of the infrared thermometer to the measured temperature change. The response time of the new infrared thermometer can even reach 1ms. If the moving speed of the target is very fast or when measuring a fast-heating target, a fast-response infrared thermometer should be selected, otherwise the sufficient signal response will not be achieved, and the measurement accuracy will be reduced.
