Thickness gauge use method and use precautions
Thickness gauges are instruments used to measure the thickness of materials and objects. Commonly used in industrial production to measure the thickness of products (such as steel plate, steel strip, film, paper, metal foil and other materials), either continuously or on a sample basis. This type of instrument has the use of α ray, β ray, γ ray penetration characteristics of radioactive thickness gauge; ultrasonic thickness gauge using ultrasonic frequency changes; eddy current thickness gauge using eddy current principle; there is the use of mechanical contact measurement principle of thickness gauge.
Thickness gauge use: test before aligning the zero position of the table. And toggle the joystick to try a few times back to zero, and then test. Lift the operation gently to avoid damage to the measuring foot and the instrument. Press the joystick with your finger to make the foot up, the object to be measured on the table. Between the measuring foot. Gently release the joystick, this time the meter reading that is the thickness of the object to be measured, after the use of the instrument into the box and placed in a dry place to prevent moisture.
In doing the thickness measurement should pay attention to the following eight points:
1. In the test should pay attention to the standard piece of collective metal magnetism and surface roughness should be similar to the test piece.
2. Be careful when measuring that the side head is kept perpendicular to the surface of the specimen.
3 in the conduct of the test should pay attention to the critical thickness of the base metal, if greater than this thickness measurement is not affected by the thickness of the base metal.
4. While taking the measurements it is important to note the effect of the curvature of the specimen on the measurements. Therefore, it is not reliable to measure on a curved specimen surface.
5. Before measurement, pay attention to the surrounding other electrical equipment will not produce magnetic field, if it will interfere with the magnetic thickness measurement method.
6. Measurement should be careful not to within the corner and near the edge of the test piece measurement, because the general thickness gauge test piece surface shape of the sudden change is very sensitive.
7. In the measurement to maintain a constant pressure, otherwise it will affect the measurement of the readings.
8. In the test should pay attention to the instrument probe and the test piece to be in direct contact, so * acoustic wave thickness gauge in the conduct of the side of the head to remove the attached material.
