vacuum leak detector

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.