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Principle of air tightness test

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Jingcheng Engineering’s Field Tests Reveal: How Accurate Is the Repeatability of Direct-Pressure Leak Testers?

This article addresses the scenario of 100% inspection on production lines in the airtightness testing industry, emphasizing that repeatability is more critical than accuracy. Based on 11 consecutive sets of actual measurement data from the JCGK Direct-Pressure Airtightness Tester by Jingcheng Engineering, the study verifies that its leakage values remain stable at 6–7 Pa, with fluctuations of only ±1 Pa. The paper analyzes the three key technological pillars supporting this performance—high-precision sensors, proprietary gas path control, and temperature drift compensation algorithms—and concludes with recommendations for selecting the appropriate model for different pressure scenarios.

Differential Pressure Leak Tester

The Most Comprehensive Guide Online! An Analysis of the Working Principle of Differential Pressure-Type Leak Tester: Taking the Jingcheng Engineering JC-C10005 as an Example

Using the Jingcheng Engineering JC-C10005 differential pressure air tightness tester as an example, systematically analyzes the core principles of differential pressure leak testing, its five-component architecture, the four-step testing process, and the mechanism for identifying micro-leaks. It compares the applicability limits of the direct pressure method and the flow method, and provides selection guidelines and practical tips for industries such as automotive, new energy, and precision die casting.

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Airtightness tester selection guide: direct pressure, differential pressure, volumetric method of the essential differences and practical choice

This article introduces the working principle, applicable scenarios and selection decision logic of the three commonly used methods (direct pressure method, differential pressure method and volumetric method) of the airtightness tester. The direct pressure method is suitable for products with holes, low cost but limited stability; the differential pressure method eliminates interference through comparative measurements, with an accuracy of 0.1 Pa, which is suitable for high-precision micro-leakage detection; the volumetric method is specially designed for fully enclosed products with no openings to realize non-destructive sealing inspection. Selection should be based on a combination of product structure, accuracy requirements and production line schedule to avoid falling into common traps such as "low price is enough" or "ignoring the jig".

Airtightness Testing_LED Lamps Case

An article to understand the principle and application of negative pressure type air tightness tester, completely solve the product sealing problems

This article provides an in-depth introduction to the principles, applications and advantages of negative pressure airtightness testers. Negative pressure testing creates a pressure difference by creating a vacuum environment to amplify small leaks, which is suitable for medical devices, electronic products and other products with very high requirements for tightness. The paper elaborates the two inspection modes of internal and external pumping, as well as practical application cases in the field of medical devices and electronic products.

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