Test medium: Pressurized air or nitrogen resp. vacuum
Detectable leakage rates: Depending on volume and pressure >0.1 cc/min
Method: Test piece and a sealed reference volume are pressurized/evacuated. Pressure difference between test piece and reference volume caused by leakages is measured and evaluated.
- measurement resolution is independent of test pressure and therefore usually much better than with the relative pressure method
- sensor equipment is slightly more expensive than for relative pressure method
- thermal and elastic changes on the test specimen influence the measurement result
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