Title:
Fluid state detector
Document Type and Number:
Japanese Patent JP6363553
Kind Code:
B2
Abstract:
A fluid state detection apparatus which can detect a short failure in which a constituent Wheatstone bridge circuit is shorted to a power supply. A combustible gas detection apparatus (1) judges that a short failure has occurred in a constant temperature control circuit (231) (S240) when a top potential V21 is equal to or greater than a first judgment value Vth1 and a difference D1 (=V11−V31) is equal to or greater than a second judgment value Vth2. As a result, apparatus (1) can distinguish “a state in which a bridge circuit (210) is shorted to a DC power supply (40) (where the constant temperature control circuit 231 is in a short failure state)” from “a state in which the resistance of the heat generation resistor (15) deceases due to a combustible gas (hydrogen)” based on the top potential V21 and the difference D1.
Inventors:
Masahiro Yamashita
Noboru Kitanoya
Masaya Watanabe
Noboru Kitanoya
Masaya Watanabe
Application Number:
JP2015079442A
Publication Date:
July 25, 2018
Filing Date:
April 08, 2015
Export Citation:
Assignee:
Nippon Special Ceramics Co., Ltd.
International Classes:
G01N27/18; G01N27/04
Domestic Patent References:
| JP201441055A | ||||
| JP2002162272A | ||||
| JP2004144617A | ||||
| JP2005308665A | ||||
| JP1019626A | ||||
| JP2012198093A | ||||
| JP200820416A |
Foreign References:
| US5804703 |
Attorney, Agent or Firm:
Nagoya International Patent Service Corporation