Patent ID: 7880471

Claim:
An adapter for a potentiometric sensor, comprising: an axisymmetric sensor shaft, which has a reference liquid opening in its exterior surface; an annular chamber member having an axisymmetric sensor opening for receiving said axisymmetric sensor shaft in a predetermined axial position relative to said annular chamber member; said sensor opening having a first annular seal-seat in a first axial section and a second annular seal-seat in a second axial section; a first sealing ring and a second sealing ring situated between said first seal-seat and said sensor shaft and between said second seal-seat and said sensor shaft, said first and said second sealing rings adapted to be clamped; a process connection member having a process connection opening, which surrounds said sensor shaft, and whose axis is aligned with the axis of said sensor opening; wherein: the axial position of said reference liquid opening lies between the first and second axial sections, when said sensor shaft is properly positioned in the adapter, so that, between said first and second sealing rings and the exterior surface of said sensor shaft, an annular chamber is formed, which is in communication with said reference liquid opening; said annular chamber member further having a duct, which extends between said annular chamber and a reference feed opening; and the axial position of said process connection member is fixed relative to said annular chamber member, and the process connection member is freely rotatable relative to said annular chamber member.