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Title:
UREA CONCENTRATION IDENTIFICATION DEVICE FOR UREA SOLUTION
Document Type and Number:
WIPO Patent Application WO/2005/026710
Kind Code:
A1
Abstract:
A urea concentration identification device comprising a concentration identification sensor unit (2) and a support unit (4) attached at the bottom end thereof with this sensor unit and provided at the top end thereof with a mounting unit (4a) to a urea solution tank opening. The concentration identification sensor unit (2) has an indirectly-heated concentration detector provided with metal fins (21c), (22c) respectively for heat-exchanging with urea solution, and a liquid temperature detector. The concentration identification sensor unit (2) is provided with a cover member (2d) that forms an opposite-ends-opened urea solution induction passage so as to surround the metal fins (21c), (22c). A single-pulse voltage is applied to the heating element of the indirectly-heated concentration detector to heat it, and a urea concentration is identified at an identification operation unit based on an output from a concentration detection circuit including the temperature sensing element of the indirectly-heated concentration detector and the liquid temperature detector.

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Inventors:
INOUE SHINICHI (JP)
KUBOTA AKIKO (JP)
TAKAHATA TAKAYUKI (JP)
Application Number:
PCT/JP2004/013214
Publication Date:
March 24, 2005
Filing Date:
September 10, 2004
Export Citation:
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Assignee:
MITSUI MINING & SMELTING CO (JP)
INOUE SHINICHI (JP)
KUBOTA AKIKO (JP)
TAKAHATA TAKAYUKI (JP)
International Classes:
F01N3/08; G01N25/18; (IPC1-7): G01N25/18; F01N3/00; F01N3/08; G01N27/18
Domestic Patent References:
WO2002027280A22002-04-04
WO2003052372A12003-06-26
WO2000021881A12000-04-20
Foreign References:
JPH11153561A1999-06-08
JPH03262949A1991-11-22
JPH01304348A1989-12-07
JPH01131155U1989-09-06
JPH10512669A1998-12-02
JP2001020724A2001-01-23
JPH11153561A1999-06-08
Other References:
See also references of EP 1669743A4
Attorney, Agent or Firm:
Yamashita, Johei (13-1 Toranomon 5-chome, Minato-k, Tokyo 01, JP)
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