GC “Tank Control” button?

[Mike5265]

Hi, does anyone know what the “tank control” button does on the control panel in the GC 600/680? It bleeps when pressed, that much I know .
Thanks

 

[Simon1]

Hi, does anyone know what the “tank control” button does on the control panel in the GC 600/680? It bleeps when pressed, that much I know .
Thanks

The beeps get closer together the more the tank is filled and a continuous tone when full.

 

[Mike5265]

Oh I did not know that! Thanks Simon