The model GA50 analysis instrument is a cost-effective solution for determining the concentration of SF6 gas in SF6 gas-filled equipment. This analysis allows for the indirect determination of contaminations in SF6 gas such as air or CF4. The GA50 is calibrated for the measurement of pure SF6 gas or SF6/N2 mixtures. The instrument can also be calibrated for SF6/CF4 mixtures on request.
The test gas should be intermediately stored at the outlet of the GA50 with a gas recovery bag so that the environmen- tally hazardous SF6 gas does not escape into the surround- ing atmosphere.
Once the recovery bag is full, the SF6 gas can be pumped back into a gas cylinder using a model GTU-10 gas transfer unit and subsequently recycled or, depending on the gas quality, be reused directly.