Electrochemical gas sensor assembly

A sensor assembly, comprising:

• a first sensing unit comprising a sensing electrode;
• a second sensing unit comprising an auxiliary electrode;
• a first sensor cover disposed on the auxiliary electrode, the first sensor cover defining a first capillary;
• wherein the first capillary is laminated with a chemical substance, reactive to a target gas, to prevent an inflow of the target gas through the first capillary;
• and
• a second sensor cover disposed on the sensing electrode, the second sensor cover defining a second capillary and permitting the inflow of the target gas therethrough.

A sensor assembly, comprising:

• a housing comprising:
• a first sensor cover, disposed on a first end of the housing, the first sensor cover defining a first capillary which is configured to allow a target gas to pass therethrough;
• a second sensor cover, disposed on a second end of the housing, the second sensor cover defining a second capillary;
• a first sensing unit;
• a second sensing unit, wherein each of the first sensing unit and the second sensing unit is positioned between the first sensor cover and the second sensor cover;
• and
• a filter, defined by a material reactive to the target gas, positioned to be in fluidic communication with the second capillary, the filter configured to prevent an inflow of the target gas therethrough.