For increase of pressure level

The test pressure for gas analysis in medium voltage switchgear is often too low. For this reason, the compressor unit is needed to compress the gas to be measured so that there is sufficient pressure for the gas measuring devices connected downstream from the compressor unit.
As the device is leak-tested there are no SF₆ emissions. The oil-free compression avoids the SF₆ test gas from being contaminated with oil mist. Any contamination of the measuring gas e. g. caused by traces of moisture can therefore be excluded.
The small compressor is almost maintenance-free and easy to handle.