1. Why use a non-contact infrared thermometer?
The non-contact infrared thermometer uses infrared technology to quickly and easily measure the surface temperature of an object. Quickly measure temperature readings without mechanical contact with the object being measured. Just aim and press the trigger to read the temperature data on the LCD display. The infrared thermometer is light in weight, small in size, easy to use, and can reliably measure hot, dangerous or difficult-to-reach objects without contaminating or damaging the object under test. Infrared thermometers can measure several readings per second, while contact thermometers take several minutes to measure per second.
Second, how does the infrared thermometer work? (working principle)
Infrared thermometers receive invisible infrared energy emitted by a variety of objects. Infrared radiation is part of the electromagnetic spectrum, which includes radio waves, microwaves, visible light, ultraviolet light, R-rays, and X-rays. The infrared is located between visible light and radio waves. The infrared wavelength is usually expressed in microns. The wavelength range is from 0.7 μm to 1000 μm. In fact, the 0.7 μm to 14 μm band is used for infrared thermometers.
Third, how to ensure the accuracy of infrared thermometer temperature measurement?
The undisputed understanding of infrared technology and its principles is its precise temperature measurement. When the temperature is measured by the infrared thermometer, the infrared energy emitted by the measured object is converted into an electrical signal on the detector through the optical system of the infrared thermometer, and the temperature reading of the signal is displayed, and several decisions are accurately measured. Important factors of temperature, Zui important factors are emissivity, field of view, distance to the spot and the position of the spot. Emissivity, all objects reflect, transmit, and emit energy, and only the emitted energy can indicate the temperature of the object. When the infrared thermometer measures the surface temperature, the instrument can receive all three of these energies. Therefore, all infrared thermometers must be adjusted to read only the emitted energy. Measurement errors are usually caused by infrared energy reflected by other sources. Some infrared thermometers can change the emissivity, and emissivity values for a variety of materials can be found in published emissivity tables. Other instruments have a fixed pre-set of 0.95 emissivity. The emissivity value is the surface temperature for most organic materials, paints or oxidized surfaces, and is compensated by applying a tape or flat black lacquer to the surface to be tested. When the tape or lacquer is brought to the same temperature as the substrate material, the temperature of the tape or lacquer surface is measured, ie, its true temperature. The distance from the spot to the spot, the optical system of the infrared thermometer collects energy from the circular measurement spot and focuses it on the detector. The optical resolution is defined as the ratio of the distance from the infrared thermometer to the object to the measured spot size (D :S). The larger the ratio, the better the resolution of the infrared thermometer and the smaller the size of the spot to be measured. Laser aiming is only used to help aim at the measurement point. A new improvement in infrared optics is the addition of near-focus characteristics that provide accurate measurements of small target areas and prevent background temperature effects. The field of view ensures that the target is larger than the spot size measured by the infrared thermometer. The smaller the target, the closer it should be to it. When accuracy is especially important, make sure the target is at least 2 times the spot size.
Fourth, how to carry out infrared thermometer temperature measurement? (Instructions)
Align the infrared thermometer with the object to be measured, press the trigger to read the temperature data on the LCD of the instrument, and ensure that the ratio of the distance to the spot size and the field of view are arranged. There are a few important things to keep in mind when using an infrared thermometer:
1. Only measure the surface temperature. The infrared thermometer cannot measure the internal temperature.
2, can not be measured by glass, glass has a special reflection and transmission characteristics, accurate infrared temperature readings are not allowed. However, temperature can be measured through the infrared window. Infrared thermometers are not used for temperature measurement (stainless steel, aluminum, etc.) on shiny or polished metal surfaces.
3. Positioning the hotspot, to find the hot spot, the instrument aims at the target, and then scans the target up and down until the hot spot is determined.
4, pay attention to environmental conditions: steam, dust, smoke and so on. It blocks the optical system of the instrument and affects accurate temperature measurement.
5. Ambient temperature. If the infrared thermometer is suddenly exposed to an ambient temperature difference of 20 degrees or higher, the instrument is allowed to adjust to the new ambient temperature within 20 minutes.
5. What are the applications of zui's ordinary infrared thermometer? (use)
Non-contact infrared thermometers have many applications, and the common ones are:
1. Automotive industry: Diagnosing cylinders and heating/cooling systems.
2. HVAC: Monitor air stratification, supply/return recording, and furnace performance.
3. Electrical: Check for faulty transformers, electrical panels and connectors.
4. Food: Scanning management, service and storage temperature.
5. Other: Many projects, bases and transformation applications.
6. Which industries need to use an infrared thermometer? (use)
Infrared instruments are mainly used in the industrial field.
1. Chemical Industry In the petrochemical industry, refineries use temperature display systems in routine preventive maintenance procedures. These procedures include monitoring of the furnace process and confirmation of thermocouple indications. In the furnace process inspection, an infrared display is used to detect the proportion of carbon accumulated in the heated surface tube. This assembly, called coking, results in a higher ignition rate of the furnace and an increase in the temperature of the tube. This high temperature condition will reduce the life of the tube. Because this coking can prevent the product from absorbing the heat of the tube evenly. When using an infrared thermometer, we will find that the tube surface temperature in the junction area tends to be higher than the tube surface temperature in other areas.
2, the glass industry in the glass industry, the product is also in the dynamic, to be heated to a very high temperature. An infrared thermometer is used to monitor the temperature in the furnace. Portable sensors detect high temperature points by measuring the outside. The temperature of the molten glass is measured to determine the temperature of the appropriate furnace mouth. In flat glass, the sensor detects the temperature at each processing stage. Incorrect temperature or excessive temperature changes can cause uneven expansion or contraction. For bottle and container products, the molten glass flows to the forehearth that is maintained at the same temperature. An infrared thermometer is used to detect the temperature of the glass in the forehearth. So it should be in the right place at the exit. In fiberglass products, infrared sensors are used to detect the temperature of the glass in the forehearth in a processing furnace. Another use of infrared sensors in the glass industry is in windshield products.
3. Steel industry The steel industry uses thermometers because the products are in motion and the temperature is very high. The ordinary steel industry application is that the temperature is a continuous state and the molten steel begins to transform into blocks. Reheating the steel at the same temperature is the key to preventing it from deforming. An infrared thermometer is used to measure the internal temperature of the regenerator. In high temperature rotary mills, infrared thermometers are used to confirm that the temperature of the product is within the limits of rotation. In a cooling mill, an infrared thermometer monitors the temperature of the steel during the cooling of the steel.
4. Preventive maintenance With a portable thermal display system, maintenance personnel can identify potential or existing problems. For example: engine coil windings are overheated, plugged cooling fins on the transformer, poor capacitive contact, and heat build up in the cylinder head of the compressor. Any problem arises with an increase in temperature, or the temperature profile is not at the same temperature as the ambient temperature, so that it can be positioned using a portable thermal display system. In most cases, problems can be identified and corrected in time before the process is stopped.
5, the plastics industry In the plastics industry, infrared thermometers are used to avoid product contamination, measuring dynamic objects and measuring high temperature plastics. During the blowing of the blown film, temperature measurements to adjust for heating and cooling can help maintain the integrity of the plastic and its thickness. During the ejection of the thrown film, the sensor helps control the temperature to ensure the thickness and consistency of the product. When the sheet is pressed out, the sensor allows the operator to adjust the extinguished heater and cold roll to ensure product quality.
