Vacuum Engineering Services Ltd,
St. Modwen Road, Stretford,
Manchester, M32 0ZE
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Application Finder

Description Method Leak Rate (mbar .l/sec) Typical Application Time for one 2mm bubble to form
Pressure decay testing
Pressure Decay		 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.
Suitable for pressure decay testingSuitable for accumulation testingnonenone
1.00E-01		 Charge Air Coolers, Exhaust Systems, Injector Tips, Pneumatics 24 bubbles per second - bubble stream
Suitable for pressure decay testingSuitable for accumulation testingnonenone
1.00E-02		 HVACTaps, domestic radiators, automotive radiators, automotive heater cores 2.4 bubbles per second - slow bubble stream
Accumulation testing
Accumulation		 New 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.
noneSuitable for accumulation testingnoneSuitable for hard vacuum testing
1.00E-03		 fuelDiesel Fuel tanks, additive tanks, metal barrels for transport of chemicals 4 seconds per bubble, sporadic bubbles can be identified with care
noneSuitable for accumulation testingSuitable for sniff testingSuitable for hard vacuum testing
1.00E-04		 HVACfuelAlloy Wheels, shock absorbers, EGR coolers 50 seconds per bubble, technician only with lighting
Sniff testing
Sniff Testing		 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.
nonenoneSuitable for sniff testingSuitable for hard vacuum testing
1.00E-05		 fuelHVACPetrol tanks, condensers, evaporators, refrigeration, compressors 8.49 bubbles per hour - in practise the hole usually blocks
nonenonenoneSuitable for hard vacuum testing
1.00E-06		 switchgeargasSF 6 switch gear, gas meters, air bags, butane filled components 0.85 bubbles per hour - in practise the hole usually blocks
Hard vacuum testing
Hard Vacuum Helium Leak Testing		 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
nonenonenoneSuitable for hard vacuum testing
1.00E-07		 fire extinguisherVirus contaminant, fire extinguishers 2.04 bubbles per day
nonenonenoneSuitable for hard vacuum testing
1.00E-08		 Nuclear fuel rods, battery cells 6.11 bubbles per month
nonenonenoneSuitable for hard vacuum testing
1.00E-09		 High vacuum components, high integrity valves for toxic media 7.44 bubbles per year

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