To verify the quality and condition of the gas in the equipment prior to the latter being put into service; typically SF6 percentage and humidity are measured,
To determine if SF6 decomposition products are present, though normally the result should always be below the permitted levels for re-used.
During Equipment Service:
Periodically(maintenance regime) Typically SF6 percentage, decomposition products and humidity are measured. these tests can identify potential problems such as:
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