Principle of Far Infrared Thermometer Performance Index of Far Infrared Thermometer
Use of Coating Thickness Gauge
When pushing the thumbwheel, do not touch the button; try to ensure that the measurement point and the two support points are on the same plane; when measuring on a rough surface, the reading will be too large. Multiple measurements are required to obtain the average value; when measuring cylinders or circular edges, be sure to use the V-shaped mouth of the instrument; when measuring the coating on hard steel with high carbon content or after heat treatment, the measured value will be lower. Too large; when the thickness of the substrate is less than the critical thickness, the measured value will be too large; the measured value will be affected by the convex and concave measurement, the measured value is too large for the convex surface, and the measured value is too small for the concave surface;
Influencing factors
1) Magnetic thickness measurement method. The so-called magnetic thickness measurement method is suitable for measuring the thickness of non-magnetic coatings on magnetically permeable materials. The magnetically permeable materials are steel, iron, silver, nickel and other metal materials;
2) Eddy current thickness measurement. It uses the electromagnetic field generated on the probe coil to form an eddy current in the process of approaching the conductor, and the size of the formed eddy current will be directly reflected in the reflection impedance, and finally reflect the thickness of the non-conductive coating on the conductive substrate. Compared with the magnetic thickness measurement method, the accuracy of this method is slightly lower, and it is suitable for measuring the thickness of non-conductive coatings;
3) Ultrasonic thickness measurement method. Because of its high cost and low measurement accuracy, the ultrasonic thickness measurement method has not been effectively applied in China at present, and only a few companies in foreign countries are using ultrasonic thickness measurement, mainly because this measurement method can measure magnetic measurement. and the thickness of multi-layer coatings that cannot be measured by eddy current measurement;
4) Electrolytic thickness measurement method. This method needs to destroy the coating for electrolytic measurement, the measurement process is complicated, and the measurement accuracy is not high, so it is not widely used;
5) Radiation thickness measurement. This kind of measuring instrument is very expensive and is only used on some special occasions.
Maintenance and Maintenance of Coating Thickness Gauge
Ensure that the thickness gauge is kept away from permanent magnets or electromagnets, and away from strong magnetic fields and strong electric fields; do not collide violently with the thickness gauge. point;
Coating Thickness Gauge Repair
If the turntable cannot stop: adjust the locking pin; if the turntable cannot be pushed: check the drive spring and gear set; if the measured value is not accurate: use a special tool to adjust the spring; the gear set is locked: clean the gear set;
