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The tracer gas widely used for mass spectrometer leaktesting is helium. Helium is a noble gas endowed with optimal characteristics for this task:

Use of recovery systems makes economic sense when considerable quantities of gas are used for leaktesting.

The quantity of gas necessary for testing basically depends on three factors:

In certain cases, the presence of a high value relative to one of the three factors suffices as justification for adoption of a recovery system.

Adoption is an imperative already when two conditions are found to be highly significant.

Recovery systems enable savings in terms of helium testing costs, enabling recovery of up to 90%, or more, of the gas used. Savings may be assessed on the basis of efficiency of recovery. Efficiency is higher the higher the difference is between the test pressure and the discharge and recovery pressure.

According to the needs of the testing system used, recovery units are available which meet needs arising at the time, with capabilities for accumulation, for volumes and varying pressures.

In testing systems which use limited amounts of gas it is frequently possible to link various workstations to the same recovery system.

The recovery system is generally autonomous in its functioning, and installation also for interlocking with already existing machines is possible.

 

Low pressures and low capacities:
1,0÷1,6 MPa (10÷16 bar)

 

Medium pressures and high capacities:
3,0÷7,0 MPa (30÷70 bar)

 

High pressures and capacities:
20÷40 MPa (200÷400 bar)

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