Title:
LIQUID STATE SENSOR
Document Type and Number:
WIPO Patent Application WO/2007/004583
Kind Code:
A1
Abstract:
A liquid state sensor in which a section for detecting a liquid level is integrated
with a section for detecting the concentration of a specific component contained
in the liquid. In the liquid state sensor (100) for measuring the level of aqueous
solution of urea and the concentration of urea, a level detecting section (70)
and a liquid properties detecting section (30) are coupled under an insulated
state. An outer tube electrode (10) and an internal electrode (20) constituting
the level detecting section (70) form a capacitor, and a level is detected based
on the capacitance which varies depending on the level of aqueous solution of
urea existing between them. A holder (120) for holding a ceramic heater (110)
is fixed to the distal end (21) of the internal electrode (20) and the holder (120)
is supported by a rubber bush (80) in the distal end (11) of the outer tube electrode
(10). Concentration of urea is determined at the liquid properties detecting
circuit section on a circuit board (60) based on a voltage value corresponding
to the resistance of a heating resistor pattern provided on the ceramic heater
(110) when a current is supplied to the heating resistor pattern for a predetermined
time.
Inventors:
SASANUMA TAKEO (JP)
SATO YOSHIKUNI (JP)
YAMAMOTO TAKASHI (JP)
SATO YOSHIKUNI (JP)
YAMAMOTO TAKASHI (JP)
Application Number:
PCT/JP2006/313139
Publication Date:
January 11, 2007
Filing Date:
June 30, 2006
Export Citation:
Assignee:
NGK SPARK PLUG CO (JP)
SASANUMA TAKEO (JP)
SATO YOSHIKUNI (JP)
YAMAMOTO TAKASHI (JP)
SASANUMA TAKEO (JP)
SATO YOSHIKUNI (JP)
YAMAMOTO TAKASHI (JP)
International Classes:
G01N27/06; G01F23/26; G01N25/18; G01N27/18; G01N27/22
Foreign References:
| JPH11507434A | 1999-06-29 | |||
| JP2001524682A | 2001-12-04 | |||
| US4924702A | 1990-05-15 | |||
| JP2004517336A | 2004-06-10 | |||
| JP2002371831A | 2002-12-26 | |||
| JP2005084026A | 2005-03-31 |
Other References:
See also references of EP 1906176A4
None
None
Attorney, Agent or Firm:
OGURI, Shohei et al. (7-13 Nishi-Shimbashi 1-chome, Minato-k, Tokyo 03, JP)
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