Title:
UREA CONCENTRATION IDENTIFICATION DEVICE FOR UREA SOLUTION
Document Type and Number:
WIPO Patent Application WO/2005/026709
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), and an enclosure (2e) that forms communication holes (26, 27) in the top and bottom end plates thereof (2e1, 2e2). 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:
IZUTANI KENJIRO (JP)
TAKAHATA TAKAYUKI (JP)
TAKAHATA TAKAYUKI (JP)
Application Number:
PCT/JP2004/013213
Publication Date:
March 24, 2005
Filing Date:
September 10, 2004
Export Citation:
Assignee:
MITSUI MINING & SMELTING CO (JP)
IZUTANI KENJIRO (JP)
TAKAHATA TAKAYUKI (JP)
IZUTANI KENJIRO (JP)
TAKAHATA TAKAYUKI (JP)
International Classes:
F01N3/00; F01N3/08; G01N25/18; F01N3/20; F01N11/00; (IPC1-7): G01N25/18; F01N3/00; F01N3/08; G01N27/18
Domestic Patent References:
| WO2002027280A2 | 2002-04-04 | |||
| WO2003052372A1 | 2003-06-26 |
Foreign References:
| JPH11153561A | 1999-06-08 | |||
| JPH03262949A | 1991-11-22 | |||
| JPH01304348A | 1989-12-07 | |||
| JPH01131155U | 1989-09-06 | |||
| JPH10512669A | 1998-12-02 | |||
| JP2001020724A | 2001-01-23 |
Other References:
See also references of EP 1669742A4
Attorney, Agent or Firm:
Yamashita, Johei (13-1 Toranomon 5-chome, Minato-k, Tokyo 01, JP)
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