A sealed device leak test is conducted using the Sentinel I28 Volumetric Fill test type which performs both a gross and fine leak test, consecutively. The diagram below shows the sequence of the Volumetric Fill leak test, and in steps, how the reference air pressure, isolation, and pressure equalization is used to measure a leak in a sealed device.
To stage the test, the sealed device is placed in the test chamber. The test chamber door is closed in preparation to start the test process.
The test begins by Source air charging the Reference Air Tank to test pressure (1). Once the starting test pressure is achieved, source air cut off to the pneumatic circuit (2)
The gross leak test begins by opening to the Test Chamber Isolation Valve (3). Air travels into the test circuit and pressure equalizes between the Reference Volume Tank and the test chamber. If the pressure stabilizes, the part passes the test and moves on to the fine leak test; however, if the pressure measurement is below a predetermined value the part has a gross leak and is rejected, ending the test cycle.
Next, the fine leak test is performed measuring the pressure loss in the test chamber over a programmed test time. The Test Chamber Isolation Valve is closed (4) for the fine leak test. If the pressure drop measurement is greater than the leak rate specification the part fails the leak test. If the pressure drop is less than the leak rate specification the component passes the leak test.
The Volumetric Fill Leak Test is provided on standard Sentinel I28 instruments, and as an option on Blackbelt instruments. Performing a Volumetric Fill pressure decay leak test on ‘seal parts’ ensures your parts are leak tight and conform to IP67 ingress contamination standards.