公开(公告)号：US20240053286A1

公开(公告)日：2024-02-15

申请号：US18366821

申请日：2023-08-08

申请人： Dräger Safety AG & Co. KGaA

发明人： Jürgen OSSWALD ,  Tom PÖTHIG ,  Jan Philipp RUGE

IPC分类号： G01N25/46

CPC分类号： G01N25/46

摘要： A gas measuring device (100) and a gas measuring process measure a concentration of a combustible target gas (CH4). A detector (10), having a detector heating segment (20), oxidizes combustible target gas. A compensator (11) having a compensator heating segment (30) oxidizes less or no target gas. A temperature sensor (14) measures the ambient temperature. A first detection variable (ΔU_B) depends on the detector temperature, a second detection variable (U11) depends on the compensator temperature. An evaluation unit (9) applies a first and a second functional relationship in order to determine, depending on the two detection variables (ΔU_B, U11), both the target gas concentration and a further environmental condition, particularly the ambient humidity. The second functional relationship, a dependence between the further environmental condition on the one hand and the detection variables and the ambient temperature on the other hand, is valid if no target gas is present.

公开(公告)号：US20230375516A1

公开(公告)日：2023-11-23

申请号：US18321036

申请日：2023-05-22

申请人： Dräger Safety AG & Co. KGaA

发明人： Matthias STUDER ,  Jürgen OSSWALD ,  Tom PÖTHIG

IPC分类号： G01N33/00

CPC分类号： G01N33/0031 ,  G01N33/0073 ,  G01N33/0011 ,  G01N33/0067 ,  G01N33/0063

摘要： A device and process monitor a spatial area for a target gas. A sensor of the gas detection device used has a detection variable (ΔUkorr,0) that is affected by the concentration of target gas. A detection variable sensor measures this detection variable (ΔUkorr,0). The influence of a slower influencing variable and of a faster influencing variable, on the detection variable (ΔUkorr,0), are computationally compensated to determine an influence-corrected detection variable (ΔUkorr,1). Depending on the influence-corrected detection variable (ΔUkorr,1), the target gas concentration is determined. For computational compensation, the time course (Dr[ΔUkorr,0]) of the respective influence of the two influencing variables is estimated, for which a measurement value series from the detection variable sensor is used. The time course (Dr[ΔUkorr,0]) is determined in such a way that the change per time unit of the influence lies within a given change tolerance band (Dr′[ΔUkorr,0]min, Dr′[ΔUkorr,0]max) for this influencing variable.

公开(公告)号：US20230341343A1

公开(公告)日：2023-10-26

申请号：US18302055

申请日：2023-04-18

申请人： Dräger Safety AG & Co. KGaA

发明人： Malte BAESLER ,  Tom PÖTHIG

IPC分类号： G01N27/04 ,  G01N1/44 ,  G01N33/00 ,  G01N31/12

CPC分类号： G01N27/04 ,  G01N1/44 ,  G01N33/0027 ,  G01N31/12

摘要： 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.

公开(公告)号：US20220268722A1

公开(公告)日：2022-08-25

申请号：US17675374

申请日：2022-02-18

申请人： Dräger Safety AG & Co. KGaA

发明人： Jürgen OSSWALD ,  Tom PÖTHIG ,  Jan Philipp RUGE

IPC分类号： G01N27/16 ,  G01N7/08

摘要： A gas detection device and a gas detection process monitor an area for a combustible target gas. A detector (10), a compensator (11.1), a sensor array (40, 41) and an analysis unit (9) are arranged in a gas detection device housing. The detector includes an electrically conductive wire with a heating segment (20), electrical insulation around the wire and a catalytic material in the electrical insulation. The compensator extends in a plane and includes an electrical strip conductor (32) with a heating segment and a carrier plate for the strip conductor. The gas detection device applies an electrical voltage to the detector and to the compensator. The detector oxidizes the target gas with the heating segment. The sensor array measures detection variables (U10, U11) for the detector and the compensator. The analysis unit compares the two detection variables to determine if a combustible target gas is present.