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Each flow meter has a positive (+), negative (-) and signal (0) terminal. The type of connector and pinout used by the coffee machine / flow meters varies by manufacturer and model. Flow meter cable plus adapters are available for the following variations.
GDS 207 plug
La Marzocco GDS 207 plug
La Marzocco coffee machines use a different pinout on the flow meters, even though they use the same type of plug.
Individual quick connect (blade) connectors
Some coffee machines have the same type of flow meters but instead of a GDS 207 plug they have individual quick connect connectors on the cable loom. Nb. La Marzocco coffee machines with quick connect connectors still use the alternate La Marzocco pinout on the flow meters.