Title:
MEASUREMENT CELL FOR ELECTRIC CONDUCTIVITY METER, AND ELECTRIC CONDUCTIVITY METER COMPRISING SAME
Document Type and Number:
WIPO Patent Application WO/2021/193274
Kind Code:
A1
Abstract:
Provided are a measurement cell for an electric conductivity meter, and an electric conductivity meter provided with the same, the measurement cell being capable of measuring electric conductivity, i.e., salt content, without systematic error even in ocean depths at a water depth in the 3000-m class or greater. An electric conductivity meter 1 is constituted from a measurement cell 3, two electrodes 5, 5, and a resistance calculation device 7. The measurement cell 3 has a double cylinder structure comprising: a glass-made cylindrical cell 9 inside which seawater to be measured passes, and on the internal peripheral surface of which are provided electrodes 5, 5 for applying a voltage to the seawater; and an insulating protective cylindrical cell 11 for covering an external peripheral part of the glass-made cylindrical cell 9 and protecting the glass-made cylindrical cell 9. The protective cylindrical cell 11 is formed from a material which has mechanical characteristics such that the Young's modulus thereof is in a range from greater than 0 to no greater than 1.5 GPa, and Poisson's ratio is in the range of 0.49 to 0.5, and the material realizes a salt content systematic error of 0.001 g/kg or less in ocean depths at a water depth of 3000 m or greater.
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Inventors:
KOBAYASHI TAIYO
Application Number:
PCT/JP2021/010759
Publication Date:
September 30, 2021
Filing Date:
March 17, 2021
Export Citation:
Assignee:
JAPAN AGENCY MARINE EARTH SCI (JP)
International Classes:
G01N27/07
Foreign References:
| JPH07280765A | 1995-10-27 | |||
| JP2018069881A | 2018-05-10 | |||
| JP2016138769A | 2016-08-04 | |||
| JP2006038507A | 2006-02-09 | |||
| JPS5067198A | 1975-06-05 | |||
| US4854728A | 1989-08-08 | |||
| US20140333307A1 | 2014-11-13 | |||
| JPH0915278A | 1997-01-17 |
Other References:
GUIDELINE OF OCEAN OBSERVATIONS, December 2016 (2016-12-01), Japan, pages 38 - 41, ISBN: 978-4-908553-21-9
Attorney, Agent or Firm:
NISHIURA Tsuguharu (JP)
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