Fluid level sensor apparatus with inter-digitated planar capacitor

A technology of liquid level sensor and capacitor, which is applied to the liquid level indicator, lubrication indicating device, measuring device and other directions of physical variable measurement, which can solve the problems affecting the reliability and accuracy of the equipment.

Inactive Publication Date: 2020-03-10
森萨塔电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One disadvantage of inserting a capacitive sensor directly into a fluid is that the properties of the fluid can affect the reliability and accuracy of the device over its lifetime

Method used

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  • Fluid level sensor apparatus with inter-digitated planar capacitor
  • Fluid level sensor apparatus with inter-digitated planar capacitor
  • Fluid level sensor apparatus with inter-digitated planar capacitor

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Embodiment Construction

[0018] The present disclosure describes a fluid level sensor device including an interdigitated planar capacitor for direct insertion into the fluid. In a particular embodiment for oil-based fluids, interdigitated planar capacitors are passivated and an oleophobic coating is applied over the passivation layer. In this embodiment, the oleophobic coating reduces the shedding time of the oil-based fluid from at least one capacitor of the device, which improves the reliability, accuracy of the device when the device is used to measure the level of the oil-based fluid in the reservoir and response time.

[0019] Still another embodiment is described below wherein the fluid level sensor arrangement includes a metal shield for supporting and reducing electromagnetic interference with interdigitated planar capacitors. Reducing interference is beneficial because it protects interdigitated planar capacitors from stray capacitance and provides environmental isolation. A metal shield th...

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Abstract

The disclosure relates to a fluid level sensor apparatus with inter-digitated planar capacitors. According to one embodiment, a fluid level sensor apparatus for directly inserting into an oil-based fluid is disclosed. The apparatus comprises a sense element that includes a plurality of electrodes mounted on one side of a substrate. In this embodiment, the plurality of electrodes form at least twointer-digitated planar capacitors, wherein a capacitance of one of the inter-digitated planar capacitors varies as a function of the level of the oil-based fluid within a fluid cavity. The apparatus in this embodiment also includes a passivation layer covering the two inter-digitated planar capacitors and an oleophobic coating covering the glass barrier layer.

Description

technical field [0001] The present disclosure relates to capacitive liquid level sensors. Background technique [0002] There are various known methods of measuring the level of fluid within a fluid container. One such method includes using one or more capacitive sensors configured to change capacitance in response to changes in the surface level of fluid within the reservoir. In this method, as the fluid level increases, the capacitance of the capacitive sensor increases because the dielectric constant of the fluid is higher than the air it replaces (k=1). For high dielectric constant fluids, such as water (k=80), the difference between the dielectric constants allows in some applications to place the capacitive sensor outside the fluid reservoir being measured. Low dielectric constant fluids such as oil (k=2-3), whose dielectric constant is closely similar to that of air, may require the insertion of capacitive sensors directly into the fluid. One disadvantage of insert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/26
CPCG01F23/263G01F23/04G01F23/268F01M11/12G01F23/265G01F23/266
Inventor 哈萨德·V·塔达斯泰勒·S·汉娜尼基尔·B·拉勒安德鲁·勒让德
Owner 森萨塔电子技术有限公司
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