EP 0721583 A1 19960717 - ELECTROCHEMICAL GAS SENSOR WITH REDUCED CROSS-SENSITIVITY
Title (en)
ELECTROCHEMICAL GAS SENSOR WITH REDUCED CROSS-SENSITIVITY
Title (de)
ELEKTROCHEMISCHER GASSENSOR MIT REDUZIERTER QUEREMPFINDLICHKEIT
Title (fr)
DETECTEUR DE GAZ ELECTROCHIMIQUE A SENSIBILITE CROISEE REDUITE
Publication
Application
Priority
- CH 9500166 W 19950719
- CH 241694 A 19940802
Abstract (en)
[origin: WO9604550A1] With the aid of a selective membrane (5a), a significant and lasting reduction in the cross-sensitivity of electrochemical gas sensors (7) to interfering gases (18) can be achieved be electrocatalytic means. A suitable catalyst (5b) is chosen to eliminate particular interfering gases (18) and applied to a gas-permeable membrane (8) in such a way that these gases are converted to products to which the measurement electrode (11a) reacts to a reduced degree or not at all, while the gas which is to be detected must not, if possible, being to react so that it can react fully at the measurement electrode (11a). Such selective membranes (5a) can advantageously be combined with membrane electrodes. Unlike conventional adsorption and chemical adsorption filters, the catalytically operating membranes (5a) remain permanently active and do not become depleted even with concentrations well above maximum workplace concentrations. Electrochemical gas sensors fitted with selective membranes (5a) of this type work with conventional evaluation electronics (in the simplest case with an ammeter (22) connected to the measurement electrode (11a) and to a counter-electrode (12)) and do not require complex electronic compensation systems.
IPC 1-7
IPC 8 full level
G01N 27/49 (2006.01); G01N 33/00 (2006.01)
CPC (source: EP)
G01N 27/4045 (2013.01); G01N 33/0014 (2013.01)
Citation (search report)
See references of WO 9604550A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
DOCDB simple family (application)
CH 9500166 W 19950719; EP 95924150 A 19950719