Patent ID: 7736478

Claim:
An ion solution concentration-detecting device comprising: a reference electrode having a first conducting wire, wherein said reference electrode is a dry reference electrode comprising: an Ag/AgCl electrode, and a polymeric membrane covering said Ag/AgCl electrode, wherein said polymeric membrane includes carboxylated poly-vinyl-chloride (PVC-COOH), Bis(2-ethylhexyl) sebacate and sodium chloride mixing with Tetrahydroofuran; a working electrode having a second conducting wire, wherein said working electrode is a dry contact sensing electrode comprising: a substrate; a conductive layer on said substrate, wherein said conductive layer is tin oxide (SnO 2 ); a sensing membrane on part surface of said conductive layer, wherein said sensing membrane includes polymer and ionic compound, and a protective layer covering said conductive layer but exposing said sensing membrane; and a link element binding into which the first conducting wire and the second conducting wire are inserted.