Liquid level sensor

A technology of liquid level detection and fixed electrodes, which is applied in measuring devices, liquid level indicators, liquid/fluid solid measurement, etc., can solve the problems of silver performance deterioration, performance degradation, poor conduction, etc.

Inactive Publication Date: 2005-01-12
NIPPON SEIKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Silver (Ag) has low resistance and excellent conductivity, but during the process of using it in fuel, due to, for example, the sulfur content, water content, ethanol content, etc. in the fuel, the performance of the silver will deteriorate or corrosion will occur. Poor conduction, so add a substance made of palladium (Pd) that deteriorates the resistance and corrosion resistance, and takes measures against performance degradation and corrosion
[0004] However, since palladium (Pd), which is a precious metal, is used as the fixed electrode, the material cost increases and the price of the liquid level detection device increases.

Method used

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Embodiment Construction

[0017] The following is based on figure 1 , figure 2 , the first embodiment of the present invention will be described. In addition, in this embodiment, the description will be made on the basis of the case where the liquid level detecting device is suitable for use in vehicles such as automobiles.

[0018] The liquid level detection device 1 is composed of the following parts, the following parts include: an insulating circuit substrate 2 such as ceramics; a plurality of fixed electrodes 3, and the plurality of fixed electrodes 3 are arranged on the circuit substrate 2; The first resistor body 4, the first resistor body 4 is arranged in a manner straddling between a plurality of fixed electrodes 3; the slider 6, the slider 6 has a sliding contact 5 sliding on the fixed electrodes 3; the second resistor body 8, the second resistor body 8 is provided on the sliding portion 7 of the fixed electrode 3 where the sliding contact 5 slides;

[0019] The fixed electrode 3 is compo...

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Abstract

A liquid level detecting apparatus resistant to the deterioration and corrosion thereof is provided while holding down an increase in the manufacturing cost thereof. This apparatus 1 has fixed electrodes 3 on which a sliding contact point 5 is slidingly moved in accordance with a fluctuation of a float, and a first resistor 4 connected to the fixed electrodes 3, the fixed electrodes 3 being made of at least silver (Ag), palladium (Pd) and a glass component, a weight ratio of the silver (Ag) to palladium (Pd) being not lower than 75 wt. % to not higher than 25 wt. %, a sliding portion 7 of the fixed electrodes 3 on which the sliding contact point 5 is slidingly moved being covered with second resistors 8 a resistance value of which is lower than that of the first resistor 4.

Description

technical field [0001] The present invention relates to a liquid level detection device, in particular to a liquid level detection device having a fixed electrode whose sliding contact slides along with the change of the float. Background technique [0002] As a conventional liquid level detecting device, for example, the type disclosed in Japanese Utility Model Patent Application No. 93102 / 1984 is included. [0003] In such a liquid level detection device, it is known that the material of the fixed electrode is generally formed by a mixture of silver (Ag) palladium (Pd) powder and glass, and the fixed electrode is obtained by mixing silver (Ag) powder and palladium (Pd) The powder is mixed with glass powder and a solvent, and the paste-like mixture is printed on an insulating circuit substrate, and after drying, it is fired. Silver (Ag) has low resistance and excellent conductivity, but during the process of using it in fuel, due to, for example, the sulfur content, water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/36H01C10/32
CPCG01F23/363H01C10/32G01F23/36
Inventor 佐藤哲也佐藤浩一中川忠夫榎本清早川肇夫岛崎义之
Owner NIPPON SEIKI CO LTD
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