Methods often used in anti-static testing instruments
The anti-static detector is suitable for measuring the electrostatic voltage (potential) of charged objects, such as the electrostatic potential of conductors, insulators, and the human body. It can also measure the liquid surface potential and detect the performance of anti-static products. It is widely used in the measurement of static electricity in the scientific research, production, storage and transportation safety management departments of petroleum, chemical industry, oil depot, fire protection, electronics, national defense, aerospace, natural gas, printing, textile, printing and dyeing, rubber, plastic, spraying, medicine, etc. It is an ideal instrument for on-site electrostatic detection.
Static electricity is a common physical phenomenon. With the rapid development of integrated circuits and the wide application of polymer materials in the past ten years, the damage caused by electrostatic force, discharge and induction phenomena has gradually increased. Since the generation of static electricity is inevitable, if the generated static electricity is not discharged in time, it may accumulate. The accumulated static charge can attract surrounding particles and cause dust accumulation, fiber entanglement and pollutant materials. Of course, the hazards of static electricity accumulation can still produce spark discharge, leading to serious accidents such as fires and explosions.
What are the methods often used when using anti-static detectors?
1, infrared method:
The infrared sensor method is used to test the principle. The pre-processed sample is clamped between the test chambers. Nitrogen with stable relative humidity flows on one side of the film, and dry nitrogen flows on the other side of the film; due to the existence of a humidity gradient , The water vapor will diffuse through the film from the high humidity side to the low humidity side; on the low humidity side, the permeated water vapor is carried by the flowing dry nitrogen to the infrared sensor. When it enters the sensor, an electrical signal of the same proportion will be generated. Analysis and calculation of the signal to obtain the water vapor transmission rate of the sample and other parameters. For packaging containers, dry nitrogen flows in the container, and the outside of the container is in a high humidity state.
2, electrolysis method:
Using the electrolytic sensor method test principle, on the low humidity side, the permeated water vapor is carried to the sensor by flowing dry nitrogen.
3, weighing method:
The anti-static detector can also use the test principle of the moisture-permeable cup weighing method. At a certain temperature, a specific humidity difference is formed on both sides of the sample. Water vapor penetrates the sample in the moisture-permeable cup into the dry one. On the other hand, by measuring the change in the weight of the moisture-permeable cup over time, the water vapor transmission rate and other parameters of the sample can be obtained.
4. Humidity method:
The sample to be tested is clamped between the dry and wet chambers at a constant temperature. The sensor in the test chamber analyzes the change of humidity in the chamber, and tracks the time required from the preset lower limit to the upper limit, through continuous measurements And system analysis, find the water vapor transmission rate and moisture permeability coefficient of the sample.