Abstract: An electrochemical gas sensor with a stacked arrangement of electrodes and nonwoven layers arranged in parallel, comprising at least one measuring electrode (3) and at least one counterelectrode (5). A porous membrane (8) that is permeable to air is in contact with the stacked arrangement of electrodes and nonwoven layers arranged in parallel at least on one side, at least one layer of a hydrophilic nonwoven (7) is located between the electrodes. The porous membrane (8) that is permeable to air and the hydrophilic nonwoven (7) extend into a separate equalization volume (9), which is filled with electrolyte at least partially and is located at least partially in one plane with the electrodes. The separate equalization volume (9) surrounds the electrode arrangement at least partially in this plane, and the porous membrane (8) that is permeable to air is exposed to ambient pressure at least in partial areas.

Abstract: A breath alcohol measuring device includes a flow chamber, for receiving exhaled breathing gas of a person, with a flow diaphragm. A differential pressure sensor has a first measuring connection via a first gas line (5) to the interior space of the flow chamber (2) upstream of the flow diaphragm (3), and a second measuring connection via second and third gas lines (12, 15) and a breath alcohol sensor (8) to the interior space of the flow chamber (2) downstream of the flow diaphragm (3). A throttling element (14) is present in the second gas line (12). The second gas line (12) is connected to a sampling system (9, 10), and an evaluating and control unit (6) is connected to the sensors (4, 8) and to the sampling system (9, 10) for controlling the sampling system.

Abstract: A gas sensor (1) with a detector element (2), which is specific to a gas to be measured and sends a measured signal that depends on the measured gas concentration, has increased measuring sensitivity for measurements in the concentration range from less than 1 ppb to a few ppb. The detector element (2) is exposed in a gas admission adapter (4) to a gas to be measured via a diaphragm (3) arranged in front of the detector element (2), wherein the gas admission adapter (4) has at least a first opening (20) for the entry of the gas to be measured as well as at least a second opening (30), which is connected with a pressure modulator, which generates periodic gas pressure vibrations in the gas admission adapter (4) and is designed, for example, as a pump (5).