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Working principle of hermetic leak detector

In order to improve the accuracy and efficiency of leak detection and realize the automation of detection, the popular leak detection method is the pressure drop method. If the differential pressure fails, the leakage of the container will inevitably cause the loss of gas quality in the container and reduce the original pressure in the container. By measuring the gas pressure drop in the container, the actual amount of gas leaked from the container can be deduced, In order to achieve the purpose of air tightness and leakage detection.

Although the air tightness detection technology based on differential pressure measurement improves the detection efficiency and automation compared with the traditional leak detection methods, it still can not meet the requirements of production efficiency in some occasions, especially when the content of the measured workpiece is large, in order to ensure a certain detection accuracy, it is necessary to ensure sufficient inflation time and balance time. Because, in the inflation process, the gas temperature will change. If the inflation time and balance time are not long enough, the temperature change can not be stabilized. When entering the detection process, the temperature change will cause the change of differential pressure, which will reduce the detection accuracy. At this time, the relationship between leak detection accuracy and leak detection efficiency becomes contradictory. In order to improve the efficiency of leakage detection, Harris Automation Technology Co., Ltd. has put forward some theories and methods, such as rapid inflation method, temperature compensation method, adding fillers to reduce the content product of the tested workpiece and so on. These detection efficiency improvement measures have been verified and developed in practical application. For example, the air tightness testing machine provided by Shenzhen Harris Automation Co., Ltd. for a gearbox manufacturer, after adopting the above efficiency improvement measures, the work beat is increased from one every 2 minutes to one every 30 seconds, and the testing efficiency is increased by 200%. In addition, in order to meet the needs of automatic production, the company has developed a variety of automatic air tightness leak detection equipment based on the air tightness detector, which integrates the functions of feeding, plugging, detection, display, alarm, unloading and so on.

Although the air tightness detection technology can detect the leakage of the workpiece, it can not determine the specific location of the leakage. In some cases, when the workpiece is unqualified, it is necessary to put the workpiece into the water tank to pass the water inspection, which further improves the automation and efficiency of air tightness inspection. In addition, with the rapid development of computer, electronics and sensor technology, the development of air tightness detection technology will usher in a new development opportunity. In the future, the air tightness detection technology will be further developed in the direction of high precision, high efficiency and intelligence. The wide application of modern air tightness leak detection equipment will play an increasingly important role in ensuring product quality, ensuring production safety and improving the economic benefits of enterprises.

In order to improve the efficiency of air tightness detection, Harris has put forward some theories and methods, such as rapid inflation method, temperature compensation method, adding filler to reduce the content product of the tested workpiece, etc. These measures have been verified and developed in practical application

This article is based on the ten years of hiruisi Automation Technology Co., Ltd. (www.hairuisi. CN), focusing on IP protection level test equipment; R & D, production and sales of waterproof testing equipment, air tightness testing equipment and sealing testing equipment

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