EP 0870190 A1 19981014 - GAS SENSOR
Title (en)
GAS SENSOR
Title (de)
GASSENSOR
Title (fr)
DETECTEUR DE GAZ
Publication
Application
Priority
- DE 9602452 W 19961218
- DE 19549147 A 19951229
Abstract (en)
[origin: DE19549147A1] To protect the sensor element, consisting of a titanate, from the chlorine, phosphorus and sulphur compounds included in the waste gas, it is proposed to cover the oxygen-sensitive sensor zones with a porous SrTiO3 layer. Appropriate lambda probes have to date not been used in spite of their long working life, since the output signal thereof demonstrates an excessively large drift due to contamination of the protective layer. A thick, porous Al2O3 film (34) covers the proposed oxygen sensor SrTiO3 layer (3) bonded by two Pt electrodes (2, 2') and precipitated on a Al2O3 substrate (1). The electrically insulating Al2O3 layer carries the protective layer (4) preferably also consisting of SrTiO3 and exposed to the waste gas. Said structure ensures that the sensor output signal representing the partial oxygen pressure still only depends on the resistance or conductance of the non-contaminated SrTiO3 sensor layer (3). The invention relates, in particular, to a rapid oxygen sensor, a lambda probe, cylinder-selective regulation of the air ratio, and gas sensors which are exposed to a gas mixture containing aggressive constituents.
IPC 1-7
IPC 8 full level
G01N 27/12 (2006.01); G01N 27/407 (2006.01); G01N 33/00 (2006.01)
CPC (source: EP KR US)
G01N 27/12 (2013.01 - KR); G01N 27/4077 (2013.01 - EP US); G01N 33/0014 (2013.01 - EP US)
Citation (search report)
See references of WO 9724609A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
DE 19549147 A1 19970703; DE 19549147 C2 19980604; EP 0870190 A1 19981014; JP 3171854 B2 20010604; JP H11501730 A 19990209; KR 19990076895 A 19991025; US 6101865 A 20000815; WO 9724609 A1 19970710
DOCDB simple family (application)
DE 19549147 A 19951229; DE 9602452 W 19961218; EP 96946098 A 19961218; JP 52397097 A 19961218; KR 19980705022 A 19980629; US 10105798 A 19980629