Device and process for measuring breath alcohol
A breath alcohol measuring device in which errors in operation can be recognized and more accurate measurement results can be obtained. The device includes a flow chamber for receiving the exhaled breathing gas volume of a person being tested and is provided with a flow diaphragm. A differential pre...
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| Main Authors | , , , |
|---|---|
| Format | Patent |
| Language | English |
| Published |
11.12.2003
|
| Online Access | Get full text |
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| Summary: | A breath alcohol measuring device in which errors in operation can be recognized and more accurate measurement results can be obtained. The device includes a flow chamber for receiving the exhaled breathing gas volume of a person being tested and is provided with a flow diaphragm. A differential pressure sensor (
4
) bridges over the flow diaphragm, with a first measuring connection of the differential pressure sensor (
4
) connected 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 of the differential pressure sensor (
4
) is connected 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 on the input side to the sensors (
4, 8
) and receives the measured signals of same. The evaluating and control unit (
6
) is connected on the output side to the sampling system (
9, 10
) for controlling same. |
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