The filter of a gas sensor comprises an inorganic porous support supporting both an organic sulfonic acid compound including sulfo group (—SO3H) and a Lewis acid having at least a metal element of transitional metal elements, Al element, Ga element, In element, Ge element, and Sn element. The Lewis acid loaded in the inorganic porous support adsorbs low concentration siloxanes. The organic sulfonic acid compound including sulfo group polymerizes adsorbed siloxanes in the filter so as not to desorb from the filter.

A gas measuring apparatus including at least one measuring channel including at least one sensor unit; and a core body including a first part and a second part, wherein the first part is joined at the second part at a flat or planar interface, and wherein the at least one measuring channel is configured in the fiat or planar interface.

The present invention relates to A method to detect a specific chemical substance in an environment, the method comprising:—providing a sensing layer adapted to sense the specific chemical substance;—providing a substrate layer, the substrate layer comprising a single-use wireless transmitter;—attaching the sensing layer to the substrate layer so as to form a sensing module;—detecting the amount of the specific chemical substance in the environment by means of the sensing layer;—if the amount of the specific chemical substance is above or below a first threshold, sending data representative of the sensed specific chemical substance to a receiving device using the wireless transmitter. The invention also relates to a sensing module and a kit to measure the specific chemical substance.

Apparatus and methods for detecting and reporting pollution at an oil facility are disclosed. The technology utilizes a logic control system to read from a pollution sensor and present the sensed data as a pollutant from a leak. The pollution leakage can be further managed and reduced.

A gas sensor assembling method includes a step for placing an element dummy such that it has a longitudinal direction in a vertical direction, wherein the cross-sectional shape of the dummy is similar to the cross-sectional shape of a sensor element, a step for fitting a through hole in an annularly-mounted member to the dummy from above vertically, wherein the through hole included in the annularly-mounted member corresponds to the cross-sectional shape of the sensor element, a step for fitting a tubular member to an outer periphery of the annularly-mounted member from above vertically, an step for placing the sensor element in contact with an upper end portion of the dummy on a single straight line, and an step for descending the dummy downwardly vertically for descending the sensor element and fitting the through hole in the annularly-mounted member to the sensor element.

A gas sensor 100 includes a sensor element 110 having a gas inlet 111; an inner protective cover 130 which has a sensor element chamber 124 thereinside and in which at least one element-chamber inlet 127 and at least one element-chamber outlet 138a are arranged; and an outer protective cover 140 in which at least one outer inlet 144a and at least one outer outlet 147a are arranged. A cross-sectional area ratio S1/S2, which is a ratio of a total cross-sectional area S1 [mm.sup.2] of the outer inlet 144a to a total cross-sectional area S2 [mm.sup.2] of the outer outlet 147a, is more than 2.0 and 5.0 or less.

An inner protective cover 130 of a gas sensor forms an element-chamber inlet 127 having a first outside opening 128a, a second outside opening 128b, and an element-side opening 129. The second outside opening 128b is disposed such that the path of a measurement-object gas from the first outside opening 128a to the element-side opening 129 of the element-chamber inlet 127 communicates in the middle thereof with a first gas chamber 122, and that there is a path shorter than the shortest path of the measurement-object gas extending from an outer inlet 144a through the first outside opening 128a to a gas inlet 111.

A gas sensor 100 includes a sensor element 110 having a gas inlet 111; an inner protective cover 130 which has a sensor element chamber 124 thereinside and in which at least one element-chamber inlet 127 and at least one element-chamber outlet are arranged; and an outer protective cover 140 in which at least one outer inlet 144a and at least one outer outlet are arranged. A minimum path length P from the outer inlet 144a to the gas inlet 111 is 5.0 mm or more and 11.0 mm or less.

A gas sensor 100 includes a sensor element 110 having a gas inlet 111; an inner protective cover 130 which has a sensor element chamber 124 thereinside and in which an element-chamber inlet 127 and an element-chamber outlet 138a are arranged; and an outer protective cover 140 including a body portion 143, which has a cylindrical shape and in which an outer inlet 144a is arranged, and a front end portion 146, which has an inner diameter smaller than that of the body portion 143 and in which an outer outlet 147a is arranged. The outer inlet 144a includes a horizontal hole 144b arranged in a side portion 143a of the body portion 143 of the outer protective cover 140. The outer outlet 147a is not arranged in a side portion 146a of the front end portion 146 of the outer protective cover 140.

Various example embodiments described herein relate to an electrochemical gas sensor. The electrochemical gas sensor can include a sensor cap having one or more solid features disposed on a surface of the sensor cap. The electrochemical gas sensor can include a counter electrode configured to generate a gas during use of the electrochemical gas sensor. The electrochemical gas sensor can include a vent assembly adapted to release at least a portion of the gas generated at the counter electrode out from the electrochemical gas sensor. The vent assembly can include a vent conduit and a vent membrane that defines a passage for the gas to flow from an extended portion of the counter electrode, to the vent conduit, via the vent membrane, so as to be vented from the electrochemical gas sensor.