Infrared Thermometer Most Frequently Asked Questions
Q : Why use a non-contact infrared thermometer ?
A: The non-contact infrared thermometer ( IR ) uses infrared technology to quickly and easily measure the surface temperature of an object. This meter can quickly generate temperature readings without touching the object. The temperature is shown on the LCD. Lightweight, compact and easy-to-use infrared thermometers and thermal imagers can safely measure hot, dangerous or difficult-to-contact surfaces without contaminating or damaging the object under test. In addition, an infrared thermometer can generate several readings per second, compared to a few minutes with a contact thermometer.
Q: How to ensure the accuracy of temperature measurement?
A: The complete understanding of infrared technology and its principle is the basis for accurate temperature measurement. When using a non-contact device to measure temperature, the infrared energy emitted from the object to be measured passes through the optical system of the pyrometer or thermal imager and is converted into an electrical signal by the sensor. This signal is again displayed as a temperature reading and/or thermal image. There are several factors that determine the measurement accuracy. The most important factors are the emissivity, distance, and field of view.
Q : What is the principle of infrared measurement ?
A : Infrared thermometers capture infrared energy radiated from all objects. Infrared radiation is a part of the electromagnetic spectrum that includes radio waves, microwaves, visible light, ultraviolet light, gamma rays, and X- rays.
Infrared is between the visible spectrum of the spectrum and radio waves. Infrared wavelengths are usually expressed in micrometers and infrared spectrums range from 0.7 to 1000 micrometers. In practice, infrared temperature measurement uses a band of 0.7 to 14 microns.
Infrared Thermometer Most Frequently Asked Questions
Q: What is the working principle of infrared thermometer?
A : The infrared thermometer consists of an optical system, a photodetector, a signal amplifier, signal processing, and a display output. The optical system converges the infrared radiation energy of the target within its field of view. The infrared energy is concentrated on the photodetector and converted into a corresponding electrical signal. The signal is then converted into the temperature value of the measured target.
Q : What are the common applications?
A : Non-contact thermometers have many uses .
Most commonly used for: industrial predictive and preventive maintenance: check transformers, electrical panels, connectors, switchgear, rotating equipment, furnaces and the like.
Automotive : diagnostic cylinder head and heating or cooling system .
Heating General Purpose and Air Conditioning Systems / Door : Monitor air stratification , supply / return damper and furnace performance .
Food service and safety : Testing storage , service and storage temperature .
Process control and monitoring : Check steel , glass , plastic , cement , paper , food and beverage process temperature .
Q : How to measure temperature
A : For temperature measurement , just point the instrument to the dot to be measured . Be sure to consider the distance ratio and field of view . Important things to keep in mind when using an infrared thermometer are :
1, only measuring the surface temperature . Infrared thermometer can not measure the internal temperature .
2. Do not conduct temperature measurements through the glass . The reflection and transmission properties of the glass are different from other materials , and the resulting infrared temperature reading is affected .
3, It is not recommended to use infrared thermometers to measure shiny or polished metal surfaces (stainless steel , aluminum, etc.) .
4, pay attention to environmental conditions . Steam , dust , smoke, etc. cover the lens , preventing accurate measurement .
5, pay attention to the ambient temperature . If the thermometer encounters a temperature difference of more than 10 degrees , let the instrument adapt to the new ambient temperature for at least twenty minutes .
6, Different objects use different emissivity . (See instruction manual)
Relationship between wavelength and emissivity .
In practical applications, the emissivity setting error will decrease with decreasing wavelength. For example, the same 1000 °C , 10% emissivity error, 5μm will cause reading error 5.5% , 1μm reading error is only 1.2% . As shown below. Therefore, for the detection of high-temperature objects, considering the influence of the peak wavelength and the emissivity of the temperature, the short-wave infrared thermometer of 0.9 to 2.5 μm should be used as far as possible instead of the 8 to 14 μm long-wave infrared thermometer. For example , in the field of high-temperature rolling mills measuring more than 1,000 degrees, 1.6 μm short-wave infrared thermometers are widely used .
Infrared thermometer product lens material some optical glass, some plastic, what is the difference?
A: The advantage of using a plastic lens is low cost, but the lens is affected by the temperature, easy to affect the accuracy of aging and deformation, and the plastic mirror is not easy to clean and maintain when dirty, the plastic lens thermometer should avoid measurement, close to high temperature objects. The use of optical lens thermometer high accuracy, suitable for harsh environments, can be applied to a variety of high and low temperature applications, easy cleaning and maintenance.
Infrared Thermometer Most Frequently Asked Questions
What is the difference between laser aiming and telescopic sighting?
A: This is a common sighting method for infrared thermometers. High-temperature objects are suitable for telescope sighting, and low-to-medium temperature measurements are suitable for laser sighting. The laser is aimed at the red laser spot, which is convenient for the object and is widely used. However, for thousands of degrees of high-temperature objects, because the object itself is mostly red, the laser spot is not clear on the object. Therefore, telescope aiming should be adopted in high-temperature applications.
Infrared Thermometer Most Frequently Asked Questions
What should you watch out for when choosing the measurement range of an infrared thermometer ?
A: Like any testing equipment, try to use the mid-range of the instrument's range as far as possible in actual use, and avoid using both ends of the range so that the instrument can be used reliably and stably. High-temperature objects Choose infrared thermometers with a short wavelength of 0.9 to 2.5 μm as much as possible to measure them more stably and accurately!
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