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Ph value measuring device comprising in situ calibration means

a technology of in situ calibration and measurement device, which is applied in the field of probes, can solve the problems of long and irksome tasks, high cost factor, and drift over time between measured values, and achieve the effects of improving reliability of device and calibration accuracy, facilitating and rapid membrane movement, and constant production of protons

Inactive Publication Date: 2015-12-10
VEOLIA EAU COMPAGNIE GENERALE DES EAUX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a way to calibrate a probe without needing to remove it from its original position or change the pH of the buffer solution it is in. This is made possible by using a membrane that allows certain ions to pass through. This membrane is made of poly(2-hydroxyethylmethacrylate), which works effectively to control changes in pH. The use of this polymer helps to create a more accurate and efficient calibration process.

Problems solved by technology

The main drawback of ISFET electrode probes is related to the fact that a drift is observed over time between the measured value of the pH and its real value.
These recalibrations therefore require qualified workers, which entails a cost factor that can be high.
They require the dismounting of the probe, which can be a lengthy and irksome task since the probe is not always very accessible.
This leads to a loss of productivity.
Thus, in certain water treatment methods, the recalibrations induce a drop in the production of treated water.

Method used

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  • Ph value measuring device comprising in situ calibration means
  • Ph value measuring device comprising in situ calibration means
  • Ph value measuring device comprising in situ calibration means

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Embodiment Construction

7.1. Reminder of the General Principle of the Invention

[0125]The general principle of the invention consists of the integration, into a pH measuring probe, of means for modifying the pH of the effluent locally, i.e. in proximity to the active part of the probe (elements of the probe in contact with the effluent at which the measurement is made).

[0126]It is thus possible to locally modify the value of the pH of the effluent so as to carry out the calibration of the probe without dismounting it or plunging it into different buffer solutions having known pH values.

[0127]The technique according to the invention thus enables a calibration to be done in situ without dismounting the pH probe and therefore facilitates the calibration, reduces the time needed for the calibration and reduces the cost inherent in this calibration.

[0128]In one variant, the invention consists of the integration, into a pH measuring probe of a type comprising an ISFET transistor, of an anode and a cathode to be p...

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Abstract

The invention concerns a device for measuring the pH of an effluent, said device comprising means for measuring an item of information representative of the pH of said effluent intended to be brought into contact with said effluent.According to the invention, such a device further comprises means for modifying the pH value of said effluent close to said means for measuring.

Description

1. FIELD OF THE INVENTION[0001]The field of the invention is that of techniques for measuring the value of the pH of a liquid effluent.[0002]More specifically, the invention pertains to the designing and manufacture of probes and to a method for the continuous measurement of the value of the pH of a liquid effluent.2. PRIOR ART[0003]Potential hydrogen, more commonly called pH, represents the chemical activity of hydrogen ions in solution. The value of the pH of a solution reveals its acidity or its basicity.[0004]The pH is a parameter used in many applications.[0005]The pH is for example used in water treatment where it is an indicator, for example of the healthy biological condition of water. It is also often used as a control parameter when implementing water treatment methods.[0006]The pH is also often used in microbiology since its value governs enzyme reactions and the growth of bacteria. The pH is also used in the pharmaceutical and medical fields since minute variations in pH...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01N27/333G01N27/416G01N27/30
CPCG01N27/3335G01N27/4165G01N27/302G01N27/414
Inventor DE COULON, YVESBERIET, CARINELEMOINE, CYRILLE
Owner VEOLIA EAU COMPAGNIE GENERALE DES EAUX
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