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1. (WO2018219550) GAS SENSOR

Pub. No.:    WO/2018/219550    International Application No.:    PCT/EP2018/059867
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Thu Apr 19 01:59:59 CEST 2018
IPC: G01N 27/407
Applicants: ROBERT BOSCH GMBH
Inventors: MEISTER, Konrad
KOTYNEK, Milan
VACHA, Karel
RENTSCHLER, Simon
Title: GAS SENSOR
Abstract:
The invention relates to a gas sensor for determining at least one constituent or at least one property of a measurement gas, having a sensor element (14) which is installed in a housing (11) and has a gas-sensitive end section (141) which distally projects from the housing (11) along a longitudinal direction (78) of the gas sensor (1) and is exposed to the measurement gas, having a protective tube module (20) which covers the gas-sensitive end section (141) and is secured to the housing (11), wherein the protective tube module (20) has an inner protective tube (21) which surrounds the end section (141) with a radial and axial distance, with the result that an interior space (121) is formed between the housing (11) and the inner protective tube (21), in which interior space the gas-sensitive end section (141) is situated, wherein the protective tube module (20) has an outer protective tube (22) which surrounds the inner protective tube (21), with the result that an exterior space (122) is formed between the outer protective tube (22) and the inner protective tube (21) in the interior of the protective tube module (20). The outer protective tube (22) and the inner protective tube (21) are formed in such a manner that a bypass flow through the inner protective tube (21) is reliably formed.