Working principle of Dalian leak testing machine

Working principle of Dalian leak testing machine

In industrial production and daily life, Dalian leak testing machines rely on different physical and chemical principles to achieve precise detection of equipment or product sealing.

Differential pressure leak testing machine is a widely used type that operates based on the gas state equation. The equipment will connect the tested workpiece to a standard sealed container, fill it with an equal amount of gas, and then close the gas path. Once there is a leak in the tested workpiece, the internal gas will escape, causing a pressure drop. High precision pressure sensors can determine the leakage situation and estimate the leakage amount by comparing the pressure difference between the two. They are commonly used for detecting plastic pipe fittings, household appliance casings, and other similar items.

The flow type leak testing machine determines the degree of leakage by measuring the gas flow rate per unit time. A flowmeter is installed between the tested workpiece and the gas source. When gas flows out from the leakage point, the flowmeter captures real-time flow rate and flow data, which can directly quantify the leakage value. It is suitable for scenarios such as air conditioning compressors and gas valves that require precise leakage.

For extremely small leaks, the helium mass spectrometer leak detector in Dalian can be called the "ultimate hunter". It utilizes the small size, fast diffusion, and stable properties of helium molecules to charge helium into workpieces or place it in a helium environment. If there is a leak, helium molecules will escape and be ionized into charged ions by the ion source of the mass spectrometer. Through the action of electric and magnetic fields, helium ions will be detected at specific locations to accurately locate the leak point and amount. This is common in high-precision fields such as aerospace and semiconductors.

Ultrasonic leak detector is based on the principle of sound waves. When gas passes through a leak hole, it generates high-frequency sound waves beyond the range of human hearing. The instrument sensor converts them into audible sound or visual signals, and the detection personnel can quickly locate the leak point based on this. It is suitable for rapid inspection of large equipment such as pipelines and pressure vessels. These leak testing machines with different principles work together to safeguard product quality and safety.