PATTERNED CHEMICAL SENSOR HAVING INERT BARRIER LAYER Russian patent published in 2014 - IPC G01N21/78 A62B7/10 

FIELD: chemistry.

SUBSTANCE: group of inventions relates to analytical chemistry and can be used to indicate the end of the service life of a filter cartridge. The chemical sensor has a film which includes a film body which reacts to the presence of a chemical by changing colour, wherein the film body comprises: a detection layer; a barrier layer; a reflecting layer between the barrier layer and the detection layer, and a semi-reflecting layer on the side of the detection layer opposite to the reflecting layer. The barrier layer has a main surface attached to the film body in given regions of the sensor, but inert to the detection layer to prevent change of colour in the film body in the region lying in a direction which is perpendicular to the main surface of the barrier layer. The group of inventions also relates to a filter cartridge having said sensor, and a respirator having one or more of said filter cartridges.

EFFECT: group of inventions increases accuracy and reliability of analysis by providing clear contrast between original and signalling colours of the sensor.

17 cl, 3 dwg, 1 tbl, 3 ex