7Inch Color Touch Screen Helium Leak Detector for PCBs Leak Detection

Technical Data of SFJ-231 Helium Leak Detector

Helium Leak Testing for PCB Sealed Chamer (Vacuum Mode)

This method is designed for circuit boards with independent sealed cavities, such as those integrating pressure sensors or MEMS components.

1. Preparation

• Verify the PCB assembly is complete and free of mechanical damage.
• Clean the cavity surface to remove oil and dust that could interfere with testing. Connect the cavity's vent port to the SFJ-231 helium leak detector using a DN25KF adapter, ensuring leak-free piping (pre-check with helium if necessary).
• Power on the detector with AC220V, 50Hz/60Hz supply, allow ≤2 minutes for startup, then select "Vacuum Mode" via the touchscreen and set the leak rate threshold according to design specifications.

2. Cavity Evacuation

• Activate the built-in or external vacuum pump to evacuate the cavity to a base pressure (typically ≤10Pa, adjusted for cavity volume and material) to eliminate residual air interference.

3. Helium Tracer & Leak Detection

• Apply trace helium (He⁴) externally along seams (e.g., lid-substrate interface) or internally via dedicated channels. Monitor the detector's display in real-time using numerical, bar, or curve graphs. If the leak rate exceeds the set threshold (e.g., 5.0×10⁻¹² Pa・m³/s, adjustable to product standards), record the leak rate and cavity ID.

4. Data Recording & Analysis

• Export test data via USB to generate leak reports and upload to production management systems (e.g., MES) via RS232/485 interfaces for quality traceability.