US 12,153,007 B2
Measurement cell for electric conductivity measuring instrument, and electric conductivity measuring instrument comprising same
Taiyo Kobayashi, Yokosuka (JP)
Assigned to JAPAN AGENCY FOR MARINE-EARTH SCIENCE AND TECHNOLOGY, Yokosuka (JP)
Appl. No. 17/912,995
Filed by JAPAN AGENCY FOR MARINE-EARTH SCIENCE AND TECHNOLOGY, Yokosuka (JP)
PCT Filed Mar. 17, 2021, PCT No. PCT/JP2021/010759
§ 371(c)(1), (2) Date Sep. 20, 2022,
PCT Pub. No. WO2021/193274, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 2020-054313 (JP), filed on Mar. 25, 2020.
Prior Publication US 2023/0160846 A1, May 25, 2023
Int. Cl. G01N 27/08 (2006.01); G01N 27/07 (2006.01)
CPC G01N 27/08 (2013.01) [G01N 27/07 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A measurement cell for an electric conductivity measuring instrument being operable to measure an electric conductivity of seawater in a deep sea at a depth of 3000 m or more; the measurement cell having a double cylindrical structure composed of a glass cylindrical cell and an insulating protective cylindrical cell, wherein:
the glass cylindrical cell, through an inside of which seawater as a measurement target passes, has a plurality of electrodes for applying a voltage to the seawater provided on an inner circumferential surface thereof,
the insulating protective cylindrical cell covers an outer circumferential portion of the glass cylindrical cell and protects the glass cylindrical cell, and
the protective cylindrical cell is formed from a material having mechanical properties such that a Young's modulus is greater than 0 and less than or equal to 1.5 GPa, and a Poisson's ratio is greater than or equal to 0.49 and less than or equal to 0.5, and achieving a systematic error of 0.001 g/kg or less in a salt content in the deep sea at a depth of 3000 m or more.