SFZ-344 Bellows Helium Leak Detection System

Place the workpiece into the vacuum chamber and complete the sealing process. Press the start button once, and the chamber door will close automatically. Valve V3 opens while all other valves remain closed. The vacuum chamber is pre-evacuated first. After the chamber reaches the preset vacuum level, the workpiece enters a pressure-holding stage for several seconds.

If no gross leak is present, the pressure remains stable, and the system continues evacuating both the chamber and the workpiece to the target vacuum level.

If the pressure cannot be maintained within the preset time, the system determines that a gross leak exists in the workpiece and automatically triggers an audible and visual alarm. The system must then be stopped, the reset button pressed, and the workpiece removed after opening the chamber door.

If no gross leak is detected, the system automatically opens V4 to evacuate the workpiece. At this stage, both the vacuum chamber and the workpiece are evacuated simultaneously.

When the chamber pressure reaches 30 Pa and the workpiece pressure reaches 2000 Pa, the helium leak detector starts automatically to measure and record the helium background level inside the chamber.

The measured leak rate during testing will be compensated by subtracting this background value, ensuring that the displayed value represents the actual leak rate of the workpiece.

After the background measurement is completed, V4 closes and V5 opens to charge the workpiece with low-pressure helium for fine leak testing.

The system automatically determines whether the workpiece passes the test and provides corresponding prompts or audible and visual alarms.

After completion of the fine leak test, the system automatically enters the helium recovery process.

Once recovery is completed, the system closes V1, V3, V4, and V5, and pauses the leak detector. Valves V6 and V7 then open to vent both the vacuum chamber and the workpiece. The workpiece can subsequently be removed, completing the test cycle.