Process interface of a process gas analyzer operating by the transmitted light method

Patent metadata

Field	Value
Publication number	US-9274050-B2
Application number	US-201414325480-A
Country	US
Kind code	B2
Filing date	Jul 8, 2014
Priority date	Jul 12, 2013
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

A process interface of a process gas analyzer operating by a transmitted light method includes a purging tube, which extends between an optoelectronic element and an interior of a plant part carrying a process gas, wherein the purging tube is closed off, at its end opposite from the optoelectronic element by a window, in the vicinity of which a purging gas feed enters the purging tube, where an annular part is arranged in the interior of the purging tube opposite the entrance of the purging gas feed and is coaxial in relation to the purging tube, and the part has a convex outer side, the vertex line of which divides the entrance of the purging gas feed into a smaller region, open toward the window, and a larger region, open toward the interior of the plant part.

First claim

The invention claimed is:

1. A process interface of a process gas analyzer operating by a transmitted light method, comprising:
a measuring head including a optoelectronic element emitting or receiving light, the measuring head being mountable on a process flange of a plant part containing or carrying a gas to be analyzed,
a purging tube extending through the process flange between the optoelectronic element and an interior of the plant part;
a window closing off the purging tube at an end opposite from the optoelectronic element and separating the optoelectronic element from the interior of the plant part;
a purging gas feed entering the purging tube in a region close to the window; and
an annular part arranged in the interior of the purging tube opposite an entrance of the purging gas feed and coaxial in relation to the purging tube, the annular part including a convex outer side, a vertex line of which divides the purging gas feed upon entry to the purging tube into a smaller region to divert a smaller portion of the purging gas, open toward the window, and a larger region to divert a greater portion of the purging gas, open toward the interior of the plant part.

2. The process interface as claimed in claim 1 , wherein the annular part contains, along the vertex line, a circumferential groove, into which a circlip holding the annular part in the interior of the purging tube is fitted.

3. The process interface as claimed in claim 2 , wherein the purging tube contains, in its interior, a groove extending through the entrance of the purging gas feed for receiving the circlip.

4. The process interface as claimed in claim 2 , wherein an opening of the circlip is disposed in a region arranged away from the entrance of the purging gas feed.

5. The process interface as claimed in claim 3 wherein an opening of the circlip is disposed in a region arranged away from the entrance of the purging gas feed.

6. The process interface as claimed in claim 1 wherein the convex outer side of the annular part is formed on both sides of the vertex line as a lateral surface of a truncated cone.

7. The process interface as claimed in claim 1 wherein the purging tube tapers within a predetermined portion of a length from the entrance of the purging gas feed in a direction of the interior of the plant part to a width corresponding at least approximately to an inside diameter of the annular part.

Assignees

• Siemens Ag

Inventors

• Schumann Christian
• Stegle Yoann

Classifications

• G01N21/534 Primary

  by measuring transmission alone, i.e. determining opacity · CPC title

• G01N33/007

  Arrangements to check the analyser (calibrating gas analysers G01N33/0006) · CPC title

• G01N21/15

  Preventing contamination of the components of the optical system or obstruction of the light path · CPC title

• G01N2201/0612

  Laser diodes · CPC title

• G01N2021/151

  Gas blown · CPC title