Measuring-probe arrangement in a gas conduit

• US 5,711,863 A
• Filed: 09/29/1995
• Issued: 01/27/1998
• Est. Priority Date: 06/01/1993
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Fries, Romuald, Henkelmann, Konrad
• Primary Examiner(s): Pyon, Harold Y.
• Application Number:
  US08/530,163
• Time in Patent Office: 851 Days
• Field of Search: 204/424, 204/427, 204/428, 204/429, 204/426, 422/94, 422/98
• US Class Current: 204/428
• CPC Class Codes: F01N 13/008 Mounting or arrangement of exhaust sensors in or on exhaust apparatus sensor arrangements for engine control F02D41/1439
• CPC Class Codes: G01N 27/4077 Means for protecting the electrolyte or the electrodes

Abstract

The invention proposes a measuring-probe arrangement for detecting gases flowing in a gas conduit, especially exhaust gases flowing in an exhaust conduit of internal combustion engines. The measuring-probe arrangement has a measuring element (13) which is surrounded in sealing fashion by a housing (11). The section of the measuring element (13a) located at the measured-gas end of the measuring-probe projects from the housing (11) and is surrounded with a clearance by a protective tube (21) which is fixed by one end section on the housing (11) and has one or more openings (22) for the measured gas. The measuring probe (10) is arranged in such a way in the gas conduit (30) that the gas opening (22) is arranged on that side of the protective tube (21) which faces away from the flow (35) of the measured gas.

Claims

1. A measuring arrangement for detecting gases flowing in a gas conduit, comprising:

a gas conduit for gases flowing in a given direction, and having an opening in its wall;

a measuring-probe having a housing with a collar, a measuring element having a first portion disposed within said housing and a second portion projecting from said housing into the opening of the gas conduit, a protective tube surrounding said second portion of said measuring element and separated from said second portion by a clearance, said protective tube having at least one gas opening, each of said gas openings positioned to face away from the direction of flow of gases in the gas conduit, and a marking on said housing outside the gas conduit indicating a position of the gas opening in said protective tube; and

a fastening means separate from said measuring-probe for securing the measuring-probe to the gas conduit such that the measuring-probe can move radially, said fastening means comprising a flange on the gas conduit at the opening therein having a thread into which a union nut is screwed to engage the collar on said housing and a sealing surface surrounding the opening in the gas conduit on which the collar of said housing rests such that the sealing surface forms a gastight seal at the point of contact with the collar.