Examples of Applications Leak Rate (mbar·l/sec) Time for one 2mm bubble to form Method Description
Charge air coolers, exhaust systems, injector tips, pneumatics
Suitable for pressure decay testingSuitable for accumulation testingnonenone
1×10-1
24 bubbles per second – bubble stream Charge product with gas, allow time to stabilise and check for pressure drop.
Simple and cost effective for small components with relatively high leak rates which are not temperature sensitive.
Pressure Decay
Taps, domestic radiators, automotive radiators, automotive heater cores
Suitable for pressure decay testingSuitable for accumulation testingnonenone
1×10-2
2.4 bubbles per second – slow bubble stream
Heater cores, charge air coolers, radiators
noneSuitable for accumulation testingSuitable for sniff testingSuitable for hard vacuum testing
1×10-3
4 seconds per bubble, sporadic bubbles can be identified with care Innovative technique using helium tracer gas but inside an enclosure so that the accumulation of helium is measured.
The advantages of non-temperature dependence and better sensitivity of hard vacuum system at a much lower cost.
Accumulation
Alloy wheels, shock absorbers, EGR coolers
noneSuitable for accumulation testingSuitable for sniff testingSuitable for hard vacuum testing
1×10-4
50 seconds per bubble, technician only with lighting
Petrol tanks, condensers, evaporators, refrigeration, compressors
nonenoneSuitable for sniff testingSuitable for hard vacuum testing
1×10-5
8.49 bubbles per hour – in practise the hole usually blocks Using a sniff test probe to measure leak rates at specific joints or connections.
Ideal for checking assembled systems where components have already been tested or products with defined leak points.
Helium or multi-gas systems offered.
Sniff Testing
SF 6 switch gear, gas meters, air bags, butane filled components
nonenonenoneSuitable for hard vacuum testing
1×10-6
0.85 bubbles per hour – in practise the hole usually blocks
Virus containment, fire extinguishers, aerospace industry, pharma/medical packaging
nonenonenoneSuitable for hard vacuum testing
1×10-7
2.04 bubbles per day The part is tested inside a hard vacuum chamber with a helium mass spectrometer.
Checks all joints with very high levels of sensitivity and reliability – the standard method for all leaks below 1.0E-3 mbar·l/s
Hard Vacuum Helium Leak Testing
Nuclear fuel rods, battery cells
nonenonenoneSuitable for hard vacuum testing
1×10-8
6.11 bubbles per month
High vacuum components, high integrity valves for toxic media, bio-medical products
nonenonenoneSuitable for hard vacuum testing
1×10-9
7.44 bubbles per year