发明名称 |
Flowmeter for fluid flow through weirs and parshall flumes |
摘要 |
A float with an iron rod movable within a double coil AC coupling network measuring backed up liquid level as the measure of open channel, ditch or stream liquid flow through a weir or parshall flume. The AC output of the liquid measuring double coil is rectified and converted to a direct current signal passed to a voltage-to-frequency converter having a frequency output sensed and processed by a microprocessor. In a memory of the microprocessor there is a flow rate for each frequency that is calculated according to the number of gallons that will flow in a unit time. Thus, it is not necessary to linearize the coil and the same kind of coil can be used for any flow, with only a memory table in the microprocessor memory being changed for linear correction. This flow rate may be added for totalizing and/or put out to a digital-to-analog converter for recording and, if desired, controlling. Variation in AC line voltage is compensated for through periodic sampling, through a relay activated by the microprocessor circuit, rectification and voltage-to-frequency conversion to produce a frequency representing a given line voltage. As the line voltage goes up or down, the microprocessor makes corrective changes to the fluid level sensed signal.
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申请公布号 |
US4321826(A) |
申请公布日期 |
1982.03.30 |
申请号 |
US19800144544 |
申请日期 |
1980.04.28 |
申请人 |
BIBBEE, WILLIAM C.;CAPPS, STANLEY B. |
发明人 |
BIBBEE, WILLIAM C.;CAPPS, STANLEY B. |
分类号 |
G01F1/00;G01F23/00;G01F23/60;(IPC1-7):G01F1/20 |
主分类号 |
G01F1/00 |
代理机构 |
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代理人 |
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