Abstract: A gas measuring device (100) and a gas measuring process measure a concentration of a component in a gas mixture (A), in particular the concentration of breath alcohol in a breath sample. The gas mixture (A) flows into a tubular input unit (1) which is detachably connected to a base body (6, 16). A portion of the gas mixture (A) is branched off and the gas sample (Gp) thus produced flows into a measuring chamber (2). A gas sensor (50) measures the concentration of the component in the gas sample (Gp). The gas sample (Gp) is branched off from the input unit (1) at an entry point (P.e) and re-enters the input unit (1) or a channel leading into the environment at a downstream exit point (P.a1). The measuring chamber (2) is connected to these two points (P.e, P.a1) by two different fluid guide units (3, 4).

Abstract: A gas detection device and a process monitor an area for a combustible target gas. A heating segment of a detector (10) is heated when electrical current flows therethrough. A heating segment of a compensator (1) is heated when electrical current flows therethrough. An electrical voltage is applied to both the detector and the compensator. The heating of the detector (10) causes a combustible target gas to be oxidized in an interior of the gas detection device. A detection variable, which depends on the temperature (Temp_10) of the detector, and a detection variable, which depends on the temperature (Temp_11) of the compensator, are measured. A presence and/or a concentration of a target gas are determined as a function of the detection variables. A quality parameter is measured and increases as the detection variable depending on the detector temperature increases and as the detection variable depending on the compensator temperature decreases.

Abstract: A sensor arrangement (100) and a process analyze a gas for at least one predetermined component and includes an electrochemical sensor (10) with a measuring electrode (20) and a counter electrode (21). An electrolyte (28) is arranged between the electrodes (20, 21). The process is carried out using such a sensor arrangement. A contact segment (7) of an electrically conductive measuring element (6, 7) is in thermal and/or electrical contact with a measurement object (20) (measuring electrode, counter electrode, or electrical contact). A connection segment (6) of the measuring element connects the contact segment to a temperature sensor (9) spatially distanced from the measurement object. The temperature sensor directly or indirectly measures the temperature of the contact segment, particularly the temperature of the connection segment. Depending on this measurement result, the temperature of the measuring electrode and/or the temperature of the counter electrode is determined and optionally controlled.

Abstract: An analyzer (100) and a process for analyzing a gas (G) for a predetermined substance. A sensor measures an indicator of the amount or concentration of the substance in a gas sample located in a measurement chamber (3). A movement of an actuating unit (4, 17, 19) in a first direction (R.1) increases the volume of a suction chamber unit (5). A movement of the actuating unit (4, 17, 19) in a second direction (R.2) decreases the volume of the suction chamber unit (5). A motor (7) rotates a cam disk (1) about an axis (MA). The actuating unit (4, 17, 19) is mechanically coupled to the cam disk (1). Each rotational position of the cam disk (1) relative to the axis (MA) determines a position of the actuation unit (4, 17, 19) and thus a volume of the suction chamber unit (5).

Abstract: A gas detection device (100) and a process monitor an area for a combustible target gas. A gas sample (G) enters into a measuring chamber (9). A semiconductor sensor (1) including an electrically conductive sensor component (10) has an electrical detection variable that changes with decreasing concentration of the combustible target gas. An oxidation component (2) oxidizes combustible target gas in the measuring chamber. The detection variable is measured at a detection time, and the oxidation component is in a switched-on state or is switched on. The oxidation component oxidizes at least a part of the combustible target gas in the measuring chamber up to a reference time. The detection variable is measured again at the reference time. The difference between the measured value at the reference time and the measured value at the detection time is an indicator for the concentration of combustible target gas.

Abstract: An electrochemical sensor arrangement (10) for a breath alcohol measuring device (100), to a corresponding breath alcohol measuring device (100) as well as to a process for determining a vitality of electrodes of an electrochemical sensor. The electrochemical sensor arrangement comprises an electrochemical sensor with at least two electrodes (12, 14). The electrochemical sensor arrangement further comprises a heat source (16). The heat source is arranged such that it, upon activation, selectively heats one of the electrodes (12) of the electrochemical sensor.

Abstract: A gas detection device and a process monitor an area for a combustible target gas. A heating segment of a detector (10) is heated when electrical current flows therethrough. A heating segment of a compensator (1) is heated when electrical current flows therethrough. An electrical voltage is applied to both the detector and the compensator. The heating of the detector (10) causes a combustible target gas to be oxidized in an interior of the gas detection device. A detection variable, which depends on the temperature (Temp_10) of the detector, and a detection variable, which depends on the temperature (Temp_11) of the compensator, are measured. A presence and/or a concentration of a target gas are determined as a function of the detection variables. A quality parameter is measured and increases as the detection variable depending on the detector temperature increases and as the detection variable depending on the compensator temperature decreases.

Abstract: A gas detection device and process detect a combustible target gas. A detector chamber (6) encloses a detector (10), and a modulator chamber (5) encloses a modulator (15). The target gas can flow from an area to be monitored through into the modulator chamber and from the modulator chamber into the detector chamber. An electrical voltage is applied to the modulator and to the detector to heat them, oxidizing the target gas in the modulator chamber and in the detector chamber. Heat energy is released bringing about an increase of the temperature of the detector. A detector sensor measures a detection variable which depends on the detector temperature. The voltage is applied to the modulator such that the temperature of the modulator oscillates. An analysis unit checks whether the detection variable oscillates synchronously with the modulator temperature, indicating the target gas is present.

Abstract: A device and a process detects alcohol in a gas sample, especially in an exhaled breath sample. A measuring chamber (2) receives the gas sample to be tested. Two IR radiation sources (7, 11) are configured to transmit an IR beam each into the measuring chamber (2). Two IR detectors (9, 13) generate a measured value each depending on an incident IR beam. An analysis unit (10) automatically makes a decision on whether or not the gas sample contains alcohol, doing so depending on the two measured values from the two IR detectors (9, 13).

Abstract: A device and a process detects alcohol in a gas sample, especially in an exhaled breath sample. A measuring chamber (2) receives the gas sample to be tested. Two IR radiation sources (7, 11) are configured to transmit an IR beam each into the measuring chamber (2). Two IR detectors (9, 13) generate a measured value each depending on an incident IR beam. An analysis unit (10) automatically makes a decision on whether or not the gas sample contains alcohol, doing so depending on the two measured values from the two IR detectors (9, 13).