| 发明名称 |
Water well monitoring system |
| 摘要 |
An apparatus and method for monitoring a liquid level in a 4-20 mA closed loop system are provided. A process instrument and a measuring unit are powered for a predetermined time and power is provided by a battery.
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| 申请公布号 |
US2003192379(A1) |
申请公布日期 |
2003.10.16 |
| 申请号 |
US20020121764 |
申请日期 |
2002.04.11 |
| 申请人 |
RIDENOUR KEITH;GARDNER JACK |
发明人 |
RIDENOUR KEITH;GARDNER JACK |
| 分类号 |
G01F23/00;G01F23/18;(IPC1-7):G01F23/00 |
主分类号 |
G01F23/00 |
| 代理机构 |
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