The reason for the jumping data of infrared thermometer
1. In this case, it is necessary to check whether the insulation of the connecting wire is damaged, and it is in regular contact with the shell of the machine to cause a short circuit to the ground.
2. The alignment of the linear infrared thermometer installed needs to be very good, but the parallelism can allow an error of ±0.5mm, and the angle can allow an error of ±12°. However, if both the parallelism error and the angle error are too large, the display numbers will jump. Then when such a situation occurs, the parallelism and angle must be adjusted.
3. The wiring of the infrared thermometer cannot be wrongly connected, and the power line and output line cannot be replaced. If the wiring is wrong, there will be a large linear error, it will be difficult to control, the control accuracy will become very poor, and the display is prone to jumping and so on.
Inventory of Factors Affecting Infrared Thermometer Data
1. The relationship between the temperature measurement target size 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. 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".
3. Measurement of targets in a strong light background: If the measured target has a brighter background light (especially under direct sunlight or strong lights), 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
1) The thermometer should be fixed on the tripod (optional accessory).
2) Accurate focusing is required, 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, and shake the eyes slightly. If there is no relative movement between the measured small black dots, then Focusing is now complete.
5. 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.
