Vacuum Engineering Services Ltd,
St. Modwen Road, Stretford,
Manchester, M32 0ZE
Other Offices:
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Accumulation leak test
- the advantages of hard vacuum leak testing without a vacuum system!Leak testing products to contain liquids (1.0E-01 to 1.0E-03 mbar.l/sec range) is generally either completed by pressure decay, mass flow or hard vacuum leak test machine.
Pressure decay & mass flow suffer from the fact that the pressure may also vary, not because of a leak but because of a change of temperature, or volume, as described in Boyle's law. The result is the measurement of leak is often smaller than the "noise" created by the temperature or volumes variation so the technique has problems in capably meeting the leak rate requirements.
Hard vacuum easily meets the requirement but is more expensive to purchase and operate than pressure decay systems.
The new development is to provide a machine based on helium contamination which can combine the benefits of hard vacuum leak testing, as below, but at a much lower price to purchase and operate.
- Easily meet the leak rate
- Quicker test than pressure decay
- Be able to test products brazed product as it cools directly after the brazing process
The new system works by helium accumulation. The heat exchanger is placed inside a sealed enclosure and charged with a helium tracer gas.
