How Infrared Thermometers Determine Slope and Emissivity
how to determine slope
Effective methods for determining slope include measuring the temperature of the object with a probe (such as an RTD), a thermocouple, or other suitable means. After obtaining the actual temperature, adjust the setting of the emissivity until the temperature reading of the sensor head is equal to the actual measured temperature, that is, the correct slope value is obtained.
How to Determine Emissivity
1. Use a probe (such as RTD), thermocouple, or other suitable methods to measure the actual temperature of the object. Adjust the value of emissivity until the temperature reading of the sensor head is the same as the actual temperature, that is, the correct emissivity is obtained.
2. If part of the surface of the object can be coated, the surface of the object can be blackened with matte carbon black. At this time, the emissivity is about 0.98. Set the emissivity to 0.98, and measure the temperature of the blackened part. Finally, measure the area adjacent to the blackened part of the object and adjust the emissivity until the temperature reading equals the actual temperature. The correct emissivity is then obtained.
3 Optimize surface temperature measurements according to the following criteria:
1. Use a measuring instrument to measure the emissivity of an object.
2. Try to avoid reflection; shield the object from the high temperature heat source in the surrounding environment.
3. When the temperature of the object is high, if there are several overlapping wavelengths available, choose a shorter wavelength.
4. For translucent materials, such as glass; when measuring temperature, ensure that the background temperature is uniform and lower than the object temperature.
5. When the emissivity is less than 0.9, the sensor head and the surface of the target object should be kept as vertical as possible. Do not let the angle between the sensor head axis and the surface normal of the object be greater than 45°
Application field of infrared thermometer
1. Steel The use of infrared thermometers can continuously measure the overall temperature of the regenerator and the efficiency of the heater. Measure the temperature on both sides of the plate to determine if the heating is even. Improve product quality
2. Glass industry Test the temperature of the furnace to ensure that the temperature of the glass is consistent from edge to edge and the glass surface is flat. Thus: ●Increased product yield ●Improved process control ●Improved product consistency ●Reduced downtime
3. Plastic industry Blown film pressing: precise temperature test can ensure the tensile strength and uniform thickness of the plastic Lamination and embossing treatment: use infrared thermometer to monitor the temperature of the film layer and control the heater
4. Heating, Ventilation and Cooling Use infrared thermometers to: Scan room temperature Check pipe temperature Test boiler temperature and evaluate boiler performance Visual air supply and return air circuits
5. Supermarkets or food processing companies Because the storage temperature of refrigerated food is generally below 4.4°C, if it exceeds this range, it may deteriorate. So you can use the infrared thermometer to check it conveniently and quickly
Other applications include: grain processing, food processing, aquatic product processing, alcoholic beverage production enterprises, inspection and quarantine departments, etc.
