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Measurement of Water in Dielectric Liquid

IP.com Disclosure Number: IPCOM000086498D
Original Publication Date: 1976-Sep-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Best, B: AUTHOR [+2]

Abstract

This apparatus has a base 2 of a dielectric such as glass and two electrodes 3 and 4 that are closely spaced. The electrodes can be formed by plating a metal film on the base and then scratching a line through the film to separate the electrodes. The apparatus is placed in a dielectric liquid and electrodes 3 and 4 are connected to device 6 for measuring capacitance and conductance at the electrodes.

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Measurement of Water in Dielectric Liquid

This apparatus has a base 2 of a dielectric such as glass and two electrodes 3 and 4 that are closely spaced. The electrodes can be formed by plating a metal film on the base and then scratching a line through the film to separate the electrodes. The apparatus is placed in a dielectric liquid and electrodes 3 and 4 are connected to device 6 for measuring capacitance and conductance at the electrodes.

Conductance between the electrodes 3 and 4 is provided by ionizable species in the dielectric liquid. Ordinarily, the amount of ionizable material in the dielectric liquid is large in relation to the amount of water, which is necessary for ionization. Conductance is thus a function of the concentration of water in the dielectric liquid. Capacitance at the electrodes is a function of the relative amounts of water and dielectric liquid and their dielectric constants. The apparatus can be calibrated by measuring the capacitance and conductance of a sample of the dielectric liquids having a known concentration of water.

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