G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 33/28 (2006.01) G01N 27/06 (2006.01) G01N 27/22 (2006.01)
Patent
CA 2565781
A method for determining condition of a highly resistive fluid in transportation and industrial equipment. The method uses apparatus that applies a high frequency oscillating voltage signals to electrodes immersed in the fluid and quantifies fluid response to the signals. Apparatus can further include means to control the temperature of the fluid, or a temperature sensor to monitor the temperature of fluid at the electrodes. The method monitors response of the fluid to the electrical signal applied by the apparatus. The frequency of the applied signal for the method is predetermined as a function of apparatus electrode geometry, fluid temperature or temperature range, and chemical composition of the fluid being monitored. The magnitude of fluid response relative to initial and the rate of change of the fluid response as a function of equipment use are used to essentially continuously determine fluid condition while in use. In particular, the method can determines approximate contaminant content of the fluid and can determine when the fluid has reached the end of its useful life due to the approximate contaminant content and/or due to loss or ability to disperse additional contaminants as very finely divided suspended particles. For apparatus or applications where the monitored fluid is not controlled to constant temperature, the method includes correcting the temperature sensitive fluid responses for temperature variations for the fluid quality and condition determination. The method can also include determining when essentially complete fluid exchanges are made to the equipment without need for additional input.
Une mEthode pour dEterminer l'Etat d'un fluide hautement rEsistant dans des Equipements industriels et de transport. La mEthode utilise un appareil qui envoie des signaux haute frEquence A tension oscillante A des Electrodes immergEs dans le fluide et qui quantifie la rEponse du fluide aux signaux. L'appareil peut Egalement Etre EquipE d'un dispositif de contrOle de la tempErature du fluide ou d'un capteur de tempErature pour surveiller la tempErature du fluide aux Electrodes. La mEthode surveille la rEponse du fluide aux signaux Electriques envoyEs par l'appareil. La frEquence des signaux envoyEs est prEdEterminEe comme une fonction de l'appareil, la gEomEtrie des Electrodes, la tempErature ou la fourchette de tempErature du fluide et la composition chimique du fluide Etant surveillEes. L'ampleur de la rEponse du fluide par rapport au dEbut et la vitesse de changement de la rEponse du fluide comme fonction de l'Equipement sont essentiellement utilisEes pour dEterminer en permanence l'Etat du fluide pendant son utilisation. La mEthode peut en particulier dEterminer la teneur approximative en contaminants du fluide et peut dEterminer si le fluide est arrivE A la fin de sa durEe de vie du fait de la teneur approximative en contaminants et/ou de la perte ou la capacitE A disperser des contaminants supplEmentaires sous forme de particules en suspension divisEes trEs finement. Pour des appareils ou des applications oU le fluide surveillE n'est pas contrOlE A tempErature constante, la mEthode englobe la correction des rEponses du fluide sensibles A la tempErature pour des variations de tempErature afin de dEterminer l'Etat et la qualitE du fluide. La mEthode peut Egalement englober la dEtermination du moment oU des Echanges complets de fluide sont rEalisEs sans avoir besoin de donnEes d'entrEe supplEmentaires.
Boyle Frederick P.
Lvovich Vadim F.
Ridout & Maybee Llp
The Lubrizol Corporation
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