Guidance on the main factors affecting 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 pay attention to the target distance when measuring small targets. 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 the closed-loop control.
(3) High alarm, low alarm - In the production process, it is required to control the temperature within a certain range, and the 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 will flash, the buzzer will sound, and the AH normally open relay will be connected.
3. Measurement of targets in a strong light background: If the measured target has a brighter background light (especially by sunlight or direct light), the accuracy of the measurement will be affected, so objects can be used to block the direct light of the target to Eliminate background light interference.
4. Measurement of small targets of infrared thermometer
⑴ The thermometer should be fixed on the tripod (optional accessory)
⑵ Need to focus, that is: use the small black dots in the eyepiece to aim at the target (the target should be full of small black dots), adjust the lens back and forth, shake the eyes slightly, if there is no relative movement between the measured small black dots, then focus it's done
5. Guidance on the main factors affecting infrared thermometers
Select the emissivity of the substance to be measured: Infrared thermometers are generally graded according to black bodies (emissivity ε=1.00), but in fact, the emissivity of the substance is less than 1.00. Therefore, when the real temperature of the target needs to be measured, the emissivity value must be set. The emissivity of matter can be found from "Data on emissivity of objects in radiation thermometry".
