Large Part Leak Test Systems

Large part leak testing poses unique challenges on the production line. The larger the internal volume of the part, the more air must be pumped into the part to test it. Increased air volume makes it more likely that the test will suffer from pressure and temperature shifts that will skew the reliability and repeatability of the test results.

This is a result of the “thermal effect” – the more air that is compressed into a cavity, the more its temperature increases. The larger the cavity and the greater the air volume, the greater the volatility of this temperature shift. Test cycles may have to be extended to achieve thermal stabilization for a reliable test result.

The unpredictably of these variables – test pressure, volume, and temperature – on the measured leak rate is further compounded by:

• 测试部分的内部体积和几何形状
• Its materials
• 使用的测试压力
• How the part’s temperature when it arrives at the test station may be in flux due to a previous production step such as a wash or exposure to cold air

The only way to fully identify and compensate for these variables is to employ more effective measurement using data-driven analytics.

Reliable in-process testing, regardless of your test method

TheSentinel 3520 leak test instrumentis optimized to address the unique challenges of large volume leak testing.

The Sentinel 3520 combines Process Signature Verification (PSV) software which uses signature analysis and signal processing algorithms, with modern electronics, sensors and pneumatics. This enables a fast and highly accurate large volume leak test via:

• 绝对压力控制在测试过程中保持恒定压力
• 多阶段压力控制可实现高量零件的精确泄漏检测并优化填充时间
• Absolute pressure regulation that mitigates atmospheric pressure changes
• 温度补偿可减轻环境变化
• 自动校准，以确保准确评估泄漏率

全部this enables operators and quality engineers to compensate, in production real-time, for the variables that can skew the measured leak rate in a large volume leak test.

3520通过在全球数百种生产线上的数千架装置证明了这一3520。

Two common methods for large-volume leak testing arepressure decay和质量流。Regardless of which method is used, the Sentinel 3520 is the ideal test instrument.