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1. 发明授权

US06202486B1 Analog liquid level sensor 失效
标题翻译：模拟液位传感器
公开(公告)号：US06202486B1
公开(公告)日：2001-03-20
申请号：US09164962
申请日：1998-10-01
申请人： John W. Kemp
发明人： John W. Kemp
IPC分类号： G01F2322
CPC分类号： G01F23/22 , G01F23/246
摘要： A sensor for determining the location of the surface of liquid in a container, includes: a hollow tubular stainless steel probe inserted into said container, said probe having one portion arranged above the surface of the liquid and having another portion submerged in the liquid; a first thermocouple operatively arranged within the probe to sense the temperature above the liquid surface; a second thermocouple operatively arranged within the probe to sense the temperature of said liquid at a point beneath the liquid surface; a resistance wire operatively arranged within the probe; a current source operatively arranged to apply a constant-current to the ends of the wire; and an ohmmeter for measuring the electrical resistance of the wire according to the equation: RT=ƒ[kaTaHh+kwTwH(1−h)] where RT is the resistance of the wire, ƒ is the symbol for “a function of”, ka is a constant for the probe first portion, Ta is the temperature sensed by the first temperature sensor, kw is a constant for the probe second portion, Tw is the temperature sensed by said second temperature sensor, H is the vertical distance between said first and second temperature sensors, and h is the distance from said first temperature sensor to said liquid surface; whereby the liquid level may be indicated by the value of h.
摘要翻译：用于确定容器中液体表面的位置的传感器包括：插入所述容器中的中空管状不锈钢探针，所述探针具有布置在液体表面上方的一部分，并且另一部分浸没在液体中; 第一热电偶，其可操作地布置在所述探针内以感测所述液体表面上方的温度; 第二热电偶，其可操作地布置在所述探针内以在所述液体表面下方的点处感测所述液体的温度; 可操作地布置在探针内的电阻丝; 电流源，其可操作地布置成将恒定电流施加到所述电线的端部; 以及用于根据以下等式测量导线的电阻的欧姆表：其中RT是导线的电阻，ƒ是“功能”的符号，ka是探针第一部分的常数，Ta是温度由第一温度传感器感测，kw是探针第二部分的常数，Tw是由所述第二温度传感器感测的温度，H是所述第一和第二温度传感器之间的垂直距离，h是与所述第一温度传感器到所述液面; 由此液位可由h的值表示。

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