US 9,651,511 B2Granted

Conductivity sensor

AssigneeABB AB

InventorsColin Howell, David Albone, David Edward Coe

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Abstract

A conductivity sensor is described in which electrodes are held in a desired position within a housing of the sensor by a number of slots accurately positioned within the housing. In one embodiment the slots are integrally formed within the housing. Once the electrodes have been inserted into the slots a thermoset resin is poured into the housing and cured. A through bore is then drilled through the housing, the electrodes and the cured resin to form a flow conduit through the sensor. A dual frequency excitation technique is also described that allows a measurement to be obtained of a polarization resistance of the electrodes. In one embodiment this measurement is stored and used to correct subsequent conductivity measurements.

Claims13

Dependent claims

A conductivity sensor comprising:

a housing defining a flow conduit for the passage of a fluid;
first and second electrodes spaced apart along said flow conduit;
excitation circuitry operable to connect to said electrodes and operable to generate excitation signals;
and
processing circuitry operable to connect to said electrodes and operable to determine conductivity measurements of fluid flowing through the housing;
wherein said excitation circuitry is operable to apply first and second excitation signals having first and second excitation frequencies respectively, to at least one of said electrodes;
and
wherein said measurements include a desired component that varies proportionally with the conductivity to be measured and an undesired component that varies with polarisation effects of the electrodes and wherein the processing circuitry is operable to use the measurements obtained for the first and second frequencies to determine a correction to be applied to said conductivity measurements for correcting for the polarisation effects of the electrodes.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/738,709Filed 12 Jun 2015 · continuation
Priority: GB 0624426.36 Dec 2006
Published: US 2015/0276642 A11 Oct 2015
Granted: 16 May 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G01N 27/07
Of a liquid: construction of measuring vessels; Electrodes therefor
G01N 27/08
Of a liquid: which is flowing continuously
G01N
Investigating or analysing materials by determining their chemical or physical properties

Family

PCT/GB2007/004657Parent of this continuation · filed 5 Dec 2007
US 2015/0276642 A1Pre-grant publication · published 1 Oct 2015
Application12/518,097Parent of this continuation
US 9,086,357 B2Parent of this continuation
US 2010/0292944 A1Published application
US 9,651,511 B2This patent

From the US filing history. Foreign family members aren’t listed.

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