:Suitable sensors for connection• Liquiphant FTL41 with electronic insert FEL48• Liquiphant FTL51B, FTL62, FTL64 with electronic insert FEL68• Liquiphant M FTL50/51/50H/51H, FTL51C with electronic insert FEL56 or FEL58• Liquiphant S FTL70/71 with electronic insert FEL56 or FEL58• Soliphant M FTM50/51/52 with FEM58• Solicap M FTI55, FTI56, Solicap S FTI77, Liquicap M FTI51, FTI52 with FEI58• Sensors certified to IEC/EN 60947-5-6• Contact switch with appropriate resistance circuit