The invention is directed to a nephelometric turbidimeter vial arrangement including a vial and a separate vial cap, whereinthe vial comprises a transparent cylindrical vial body enclosing a vial interior, a bottom inlet window and a circular top vial opening, wherein the vial cap closes the top vial opening and comprises a light trap cavity (70) which is open to the vial interior, wherein the inner surface (81,82) of the light trap cavity (70) is a light absorbing surface, and wherein the vial cap (60) is provided with a chip cavity (72), wherein an RFID chip (90) is provided in said chip cavity.
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