| 发明名称 |
Device for determining the level of a medium in a container |
| 摘要 |
The invention relates to a device for determining the level (F) of a medium (<bold>3</highlight>) in a container (<bold>2</highlight>) using a capacitive sensor (<bold>4</highlight>). A voltage source which subjects the sensor (<bold>4</highlight>) to a measuring frequency (f<subscript>M</highlight>) is provided, as is a measuring/evaluating circuit (<bold>6</highlight>) which establishes the measured capacitance (C<subscript>M</highlight>), compares this to a predetermined capacitance value and provides the information concerning the level (F) of the medium (<bold>3</highlight>) in the container (<bold>2</highlight>). The aim of the invention is to increase the measuring sensitivity of a capacitive sensor (<bold>4</highlight>) without increasing the sensitivity of the sensor to interfering signals. To this end, the measuring/evaluating circuit (<bold>6</highlight>) has at least one inductance (L) which together with the measured capacitance (C<subscript>M</highlight>), forms a resonant circuit (<bold>7</highlight>).
|
| 申请公布号 |
US2003192380(A1) |
申请公布日期 |
2003.10.16 |
| 申请号 |
US20030203622 |
申请日期 |
2003.01.16 |
| 申请人 |
FLORENZ HANS-JORG;WERNET ARMIN |
发明人 |
FLORENZ HANS-JORG;WERNET ARMIN |
| 分类号 |
G01F23/26;(IPC1-7):G01F23/00 |
主分类号 |
G01F23/26 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
