公开(公告)号：AT125946T

公开(公告)日：1995-08-15

申请号：AT89902875

申请日：1989-02-07

Applicant: ROSEMOUNT INC

Inventor： SITTLER FRED C ,  NETI RADHAKRISHNA M ,  TOY ADRIAN C

IPC: G01N27/30 ,  G01N27/42 ,  G01N27/416

公开(公告)号：CA2119436A1

公开(公告)日：1993-04-29

申请号：CA2119436

申请日：1992-10-07

Applicant: ROSEMOUNT INC

Inventor： BENTON BARRY W ,  MAJERUS LAWRENCE R ,  RUTT DONALD R ,  SITTLER FRED C ,  TOY ADRIAN C

IPC: G01N27/30 ,  G01N27/333

Abstract: A pH sensor has an electrode assembly with an electrode with a core of an electrochemically inert insulating or semiconductive material, and is coated with an electrically conductive, electrochemically sensitive coating. The preferred core is insulating and made of alumina, with a thin coating of iridium oxide deposited over at least a portion of the outer surface of the core. The coating is carried to a region remote from the sensing surface and is used for making electrically conductive connections that lead to remote circuitry. The core is made in a form that can be supported and held in an insulating, electrochemically inert, deformable material that is sealed around the outer surface of the coating on the core to prevent leakage of chemicals being sensed. An outer housing also permits sealing quite easily into access ports on which the sensor housing is mounted.

公开(公告)号：CA1266803A

公开(公告)日：1990-03-20

申请号：CA529274

申请日：1987-02-09

Applicant: ROSEMOUNT INC

Inventor： SITTLER FRED C ,  TOY ADRIAN C

IPC: G01K7/18 ,  H01C1/028 ,  H01C1/032 ,  H01C7/02 ,  H01C17/00 ,  H01C3/04

Abstract: A thin film platinum resistance thermometer capable of operation at elevated temperatures includes a benign dielectric layer covering the thin film platinum resistance temperature sensing element and a barrier layer overlying the dielectric layer The barrier layer which is preferrably titanium dioxide, resists diffusion of contaminants which would alter the electrical characteristics of the sensing element while permitting diffusion of oxygen through the barrier layer