Helium accumulation method

Testing medium: Helium

Detectable leakage rates: >0.001 cc/min

Method:
Test specimen is pressurized. Through leakages test gas emerges into a chamber enclosing the test specimen. The test gas is homogenized by a fan. Thru extraction of a gas sample the helium concentration is determined. After calibration with a test leak the overall leakage rate can be determined quantitatively.

Functional principle helium accumulation method

Advantages:

low leakage rates detectable
no vacuum in the test chamber necessary
no influence on the measurement result through thermal effects
cost-efficient and maintenance-free sensor system

Drawbacks:

for complex test specimen geometries, homogenization of test gas difficult under atmospheric pressure
eventually high extension of cycle time caused by helium contamination in test chamber
disturbances through natural occurrence of helium in the atmosphere
often unsuitable for testing plastic parts due to high permeation of helium

Helium accumulation method

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