A reference structure and a separator assembly is provided. The separator assembly provides a base layer, a first contact, an optional second contact and a reference component which may be implemented in various applications. The base layer includes a first side and a second side. The first contact is affixed on the first side of the base layer between the base layer and an anode. The second contact is affixed on the second side of the base layer. A reference component is affixed to the second side of the base layer and the optional second contact, if implemented. The reference structure includes a semi-permeable reference component affixed or coupled to a base element.