A guide to the most important factors that affect infrared thermometers
1. The relationship between the target size of the infrared thermometer and the temperature measurement distance: At different distances, the effective diameter D of the measurable target is different, so when measuring small targets, pay attention to the target distance. The definition of the distance coefficient K of the infrared thermometer is: the ratio of the distance L of the measured target to the diameter D of the measured target, that is, K=L/D
2. Infrared thermometer temperature output function
(1) Digital signal output - RS232, RS485, temperature signal remote transmission
(2) Analog signal output - 0~5V, 1~5V, 0~10V, 0/4~20mA, which can be added to closed-loop control.
(3) High alarm and low alarm - During the production process, the temperature is required to be controlled within a certain range, and high and low alarm values can be set. High alarm: When the high alarm setting is turned on, when the temperature is higher than the high alarm value, the corresponding LED light flashes, the buzzer sounds, and the AH normally open relay is connected.
3. Measurement of targets in a strong light background: If the target to be measured has a brighter background light (especially if it is directly exposed to sunlight or strong lamps), the accuracy of the measurement will be affected. Therefore, objects can be used to block the strong light directly hitting the target. Eliminate background light interference.
4. Measurement of small targets with infrared thermometer
⑴ The thermometer should be fixed on a tripod (optional accessory)
⑵ Accurate focusing is required, that is: use the small black dot in the eyepiece to align the target (the target should be filled with small black dots), adjust the lens back and forth, and shake your eyes slightly. If there is no relative movement between the small black dots being measured, adjust the focus. The focus is complete
5. Guidance on the main factors affecting infrared thermometers
Select the emissivity of the substance to be measured: Infrared thermometers are generally classified according to black bodies (emissivity ε = 1.00), but in fact, the emissivity of substances is less than 1.00. Therefore, when the true temperature of the target needs to be measured, the emissivity value must be set. The emissivity of a substance can be found in the "Data on the Emissivity of Objects in Radiation Thermometry".
