List of articles related to Airtightness Tester - Precision Engineering Airtightness

How to Test for Leaks in Product Seals Without Contacting Water: The Principles and Limitations of Air Leak Testers

This article explains the principle behind airtightness testers, which detect product leaks by measuring changes in air pressure or flow rate within a sealed chamber. It also presents a case study of a road surveying instrument that measured 1 Pa at 15 kPa and passed a water immersion test with no bubbles, demonstrating that the two methods can be used for cross-validation. The article also emphasizes that pass/fail thresholds must be set according to standards, and that resolution is not equivalent to accuracy; airtightness testing is suitable for mass-production screening and traceability, while the water immersion method is better suited for visually locating leak points.

Quick Q&A: With so many domestic manufacturers of airtightness testers, why shouldn’t you base your selection solely on price?

This article focuses on selecting domestic air-tightness testers, covering topics ranging from price traps, testing methods, technical capabilities, brand reputation, and a five-step evaluation method for import substitution to a five-item supplier audit checklist. systematically addresses the six core procurement challenges faced by enterprises. Using JCGK as an example, it helps manufacturing companies select reliable suppliers that meet requirements for accuracy, production cycle times, and data traceability.

A Comprehensive Guide to Power Battery Leak Testing: National Standard Updates, Testing Methods, and Selection Guidelines

This article focuses on the implementation of the new national standard GB 38031-2025 and systematically outlines the entire process of airtightness testing for power battery packs: It analyzes the fundamental differences between type testing and production line testing, compares the applicable scenarios for the four methods—direct pressure, differential pressure, flow-based, and helium leak testing—provides recommendations for selecting equipment for different components, and emphasizes that parameter settings must adhere to technical agreements. The paper also advocates for the objective evaluation of equipment through sample validation and repeatability testing, thereby offering a practical guide for production line acceptance.

Q&A: Can Domestic Leak Testers Replace Imported Equipment? A Guide to Rational Evaluation

This article explains how domestic alternatives to industrial leak detection equipment are becoming a hot topic in manufacturing for reducing costs and improving efficiency, but the discussion often gets bogged down in two extremes: “catching up completely” or “not daring to take risks.” In fact, the answer depends on the specific scenario: the true value of substitution lies in eliminating hidden friction costs—such as spare parts cycles and technical support—and gaining comprehensive adaptation capabilities, including parameter switching, system integration, and customization, rather than simply replacing a single instrument.

Jingcheng Engineering’s Liquid-Cooling Testing Solution System (2)

A Comprehensive Guide to Liquid-Cooled Leak Testing Solutions: From Testing Principles and Industry Standards to Automated Mass Production

This article focuses on airtightness testing of liquid-cooling systems and points out that leaks are a critical weakness in liquid-cooled heat dissipation. The article compares the applicable scenarios for four testing methods—direct pressure, differential pressure, helium mass spectrometry leak detection, and water immersion bubble testing—outlines the scope of relevant industry standards for 2024–2026, and emphasizes that test pressure, equilibration time, and leak limits must be scientifically determined based on the actual product specifications— —Passing an airtightness test does not guarantee product quality; a comprehensive validation system must also include follow-up tests such as flow rate measurement, pressure endurance testing, and environmental stress testing.

The Application of Jingcheng Engineering’s Airtight Equipment in Automated Workshops

Quick Q&A: What Is a Leak Tester Used For? A Must-Read Guide for Beginners—From Principles to Applications

This article describes how airtightness testers use four methods—positive pressure, negative pressure, differential pressure, and flow rate—to perform “controlled gas testing” on products, thereby detecting minute leaks that are invisible to the naked eye. When selecting a model, higher accuracy is not necessarily better; rather, the equipment should be matched to the product’s structure and permissible leak rate. Only through the use of custom fixtures and sample validation can a stable, traceable quality system be established.

What is the pressure limit for a negative-pressure leak detector? Jingcheng Engineering provides a detailed explanation of the vacuum and pressure equalization testing procedures.

This article begins by addressing the anomalous reading of “-104 kPa” encountered by engineers, pointing out that the limit for negative gauge pressure is the local atmospheric pressure; values below -100 kPa are physically impossible and are typically caused by confusion regarding pressure references or sensor drift; Based on the national standard GB/T 25752, it explains the principles of negative pressure leak detection, the testing process, and common sources of interference, emphasizing that equipment selection should focus on the device’s actual performance and repeatability rather than peak readings displayed on the screen.

A die-cast part with an intact exterior does not necessarily mean it is completely sealed internally

Quick Q&A: How can you quickly identify minor defects—such as porosity, sand holes, and cracks—in die-cast parts?

This article introduces the principles and methods of airtightness testing for die-cast parts. Differential-pressure leak detectors determine whether pores, sand holes, or cracks have formed through-leaks by comparing the pressure difference between a reference part and the part under test; they do not detect all internal defects. In practice, the custom tooling, the balancing phase, and the validation of reference parts are most often overlooked. A mature quality control plan should combine non-destructive testing, airtightness testing, and automated 100% inspection.

Training and explaining the instrument to customers

A Comprehensive Analysis of the Causes of Negative Readings in Differential Pressure Leak Testing: Jingcheng Engineering Identifies Four Major Systemic Sources of Interference!

This article analyzes the causes of negative readings in differential pressure-based airtightness testing and proposes solutions. The article points out that negative readings do not indicate product leakage or instrument malfunction, but rather result from the pressure at the reference end dropping faster than at the test end, causing the pressure comparison between the two sides to be reversed. There are four main causes of negative values: micro-leaks in the reference component or aging seals; excessive differences in volume between the product under test and the reference chamber; pressure desynchronization on both sides due to temperature changes; and slight deformation of fixtures or tubing under pressure.