The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 20, 2004
Filed:
Mar. 27, 2002
Koichi Sato, Nagaoka, JP;
Kiyoshi Enomoto, Nagaoka, JP;
Nippon Seiki Co., Ltd., Niigata, JP;
Abstract
A resistance-type liquid level measuring apparatus which suppresses a detection voltage error due to silver sulfide within a permissible range in practical use and enables measurement indication with accuracy, and comprises a resistance-type sensor including a float floating according to a liquid level, an insulating substrate having a plurality of conductor electrodes connected with a resistor , and a movable contact interlocked with a movement of the float to come in contact with the conductor electrodes on the insulating substrate , in which a material containing silver is used as a material of the conductor electrodes or the movable contact, a voltage dividing resistance is connected with a power source BA in series with the resistor , and a voltage of a connection point between the voltage dividing resistance and the resistor is outputted as a signal corresponding to the liquid level, and resistance values of the voltage dividing resistance and the resistor are set so that a voltage drop VS due to silver sulfide generated between the conductor electrode and the movable contact becomes % or less, preferably % or less with respect to a difference between a voltage VF equivalent to a full tank of the liquid level and a voltage VE equivalent to a low region.