G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 33/497 (2006.01) A61B 5/097 (2006.01) B60K 28/06 (2006.01) G01N 33/98 (2006.01)
Patent
CA 2431674
The present invention proposes an improved breath alcohol measuring device with which functional errors can be identified and more accurate measurement results can be achieved. This device has the following features: 1.1 A flow chamber (2) for receiving the flow of breath exhaled by an individual who is to be tested incorporates a flow diaphragm (3); 1.2 The flow diaphragm (3) has a differential pressure sensor (4) that bridges this; 1.2.1 The first measurement connection of this is connected by way of a first gas line (5) to the interior space of the flow chamber (2), upstream from the flow diaphragm (3), and 1.2.2 The second measurement connection of this is connected by way of second and third gas lines (12, 15) and a breath alcohol sensor (8) to the interior space of the flow chamber (2) downstream from the flow diaphragm (3); 1.3 There is a choke element (14) in the second gas line (12); 1.4 The second gas line (12) is connected to a sampling system (9, 10); 1.5 An evaluation and control unit (6) is connected at the inlet side to the sensors (4, 8) and receives measurement signals from this; 1.6 The evaluation and control unit (6) is connected at the output side to the sampling system (9, 10) in order to control it.
Busack Hans-Jurgen
Chrzan Rigobert
Kruger Dieter
Stock Burkhard
Draeger Safety Ag & Co. Kgaa
Fetherstonhaugh & Co.
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