DILO B058R01 SF6 compact service cart operation

Dear all,
Recently I've found a DILO B058R01 SF6 compact service cart machine kept in our store for a long time. This is a very useful machine for handling SF6 gas. But it do not have any Operating Manual/Service Manual. I've searched DILO website but did not find any manual. Searched google, but same result, no manual. Found only some catalogues. So I need an Operating Manual/Service Manual of DILO B058R01 SF6 compact service cart machine.
Or if anyone can describe it's operating procedure, I'll be very much obliged. This machine has four nos. port of same size, makes us confused.

Thanks in advance.
 

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