US 11,668,669 B2
Electrochemical gas sensor
Rigobert Chrzan, Bad Oldesloe (DE); Rolf Eckhardt, Hamburg (DE); Andreas Nauber, Stockelsdorf (DE); Susanne Schaefer, Lübeck (DE); and Michael Sick, Timmendorfer Strand (DE)
Assigned to Dräger Safety AG & Co. KGaA, Lübeck (DE)
Appl. No. 16/87,368
Filed by Dräger Safety AG & Co. KGaA, Lübeck (DE)
PCT Filed Mar. 21, 2017, PCT No. PCT/EP2017/000356
§ 371(c)(1), (2) Date Sep. 21, 2018,
PCT Pub. No. WO2017/162332, PCT Pub. Date Sep. 28, 2017.
Claims priority of application No. 10 2016 003 452.1 (DE), filed on Mar. 23, 2016.
Prior Publication US 2020/0326298 A1, Oct. 15, 2020
Int. Cl. G01N 27/404 (2006.01); G01N 27/416 (2006.01)
CPC G01N 27/404 (2013.01) [G01N 27/416 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electrochemical gas sensor for measuring gaseous components in an air and/or gas mixture, the electrochemical gas sensor comprising:
a sensor housing;
a measuring electrode arranged in the sensor housing;
a counter electrode arranged in the sensor housing;
an electrolyte located between the measuring electrode and the counter electrode;
a diffusion barrier associated with the sensor housing and configured such that a specifically settable gas flow of the air and/or gas mixture intended for a concentration determination can be fed to the measuring electrode from a surrounding area, the diffusion barrier comprising one or more capillaries, the one or more capillaries having a capillary opening; and
at least one gas-permeable, hydrophobic pressure absorption element covering the diffusion barrier in an interior of the sensor housing and which lies on an inner surface of the sensor housing, wherein the at least one pressure absorption element surrounds an entire circumference of the capillary opening, wherein the at least one pressure absorption element is provided between the diffusion barrier and the measuring electrode, wherein the inner surface has a mean roughness depth that is lower than or equal to 2 μm at least in an area on which the at least one pressure absorption element lies, the at least one pressure absorption element being configured to dampen or absorb pressure surges propagating to the measuring electrode, the at least one pressure absorption element comprising a first pressure absorption element surface and a second pressure absorption element surface, the second pressure absorption element surface being located opposite the first pressure absorption element surface, the second pressure absorption element surface being located at a distance from the measuring electrode and each and every portion of the second pressure absorption element surface being free of contact with the sensor housing, wherein a space between the second pressure absorption element surface and the measuring electrode is filled with fluid.