FR2564969A1 - System for hydrostatic measurement of the level of liquid, such as recording tides, capable of being periodically calibrated by comparison with columns of liquid of the same nature acting as a reference assuring millimetre accuracy and reliability - Google Patents
System for hydrostatic measurement of the level of liquid, such as recording tides, capable of being periodically calibrated by comparison with columns of liquid of the same nature acting as a reference assuring millimetre accuracy and reliability Download PDFInfo
- Publication number
- FR2564969A1 FR2564969A1 FR8408482A FR8408482A FR2564969A1 FR 2564969 A1 FR2564969 A1 FR 2564969A1 FR 8408482 A FR8408482 A FR 8408482A FR 8408482 A FR8408482 A FR 8408482A FR 2564969 A1 FR2564969 A1 FR 2564969A1
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- FR
- France
- Prior art keywords
- pressure
- columns
- sensor
- liquid
- level
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
L'invention décrite plus loin s'applique entre autres a un maregraphe qui a pour but de mesurer avec une precision millimetrique le niveau de la mer ou'd'un liquide ,quel que soit l'agitation du milieu,les variations de pression barometriques, de temperatre ou de salinité
Le systeme est capable de compenser toutes les dérives du milieu ou du systeme de mesure
Les appareils actuellement utilises pour mesurer les nivaux ,+ont appel a des flotteurs asservis a des poulies dont on mesure le déplacement angulaire,ou a des capteurs de pression mesurant la pression hydrostatique representant la colonne d'eau les surmontant,ou des radars, ou des sondeurs acoustques immergés regardant la surface.The invention described below applies inter alia to a tide gauge which aims to measure with millimetric precision the sea level or of a liquid, whatever the agitation of the medium, the barometric pressure variations , temper or salinity
The system is capable of compensating for any drifts in the medium or in the measurement system
The devices currently used to measure the levels, + call on floats slaved to pulleys whose angular displacement is measured, or to pressure sensors measuring the hydrostatic pressure representing the water column surmounting them, or radars, or immersed acoustic sounders looking at the surface.
Tous ces appareils sont sensibles aux conditions d'environnement tels que la pression barometrique,les v iations de densité ou de temperature ou simplement la dérive du systeme de mesure lui meme. All these devices are sensitive to environmental conditions such as barometric pressure, changes in density or temperature or simply the drift of the measurement system itself.
l'invention décrit un marégraphe a capteur de pression differentielle pesant alternativement la colonne d'eau qui le surmonte et des colonnes d'eau de réference,de hauteur parfaitement connues qui servent de valeurs de réference pour i 'étalonnage permanent de la chai ne de mesure
Le maregraphe objet de l'invention est décrit ci dessous mais,cette description ne constitue pas un exemple limitatifs d'autres methodes d'application peuvent etre utilisées
Le système est installe dans un puits 115 creusé dans le sol ou constitue par une maçonnerie le long d'un quai.the invention describes a tide gauge with differential pressure sensor alternately weighing the water column which surmounts it and reference water columns, of perfectly known height which serve as reference values for the permanent calibration of the chain of measured
The tide gauge object of the invention is described below, but this description does not constitute a limiting example of other application methods can be used.
The system is installed in a well 115 dug in the ground or constitutes by a masonry along a quay.
il est mis en communication avec a mer par une canalisation (2). it is placed in communication with at sea by a pipe (2).
le fond du puits (.3) doit etre fermement solidaire du sol c est lui qui servira de référence à la mesure.the bottom of the well (.3) must be firmly attached to the ground; it is this which will serve as a reference for the measurement.
L'ensemble est surmonté d une construction de protection (4)
Fixé sur la base (3) est installé un capteur de pressior; différentielle (5) dont l'une des faces est mise en contact avec ec la pression barométrique par un tube allant a la surface (6) l'autre face est raccordée a une boite à clapets (7) le mettant tour à tour en contact avec l'eau du milieu ambiant soit avec la colonne de référence haute (8)soit avec la colonne de référence basse (9).The whole is surmounted by a protective construction (4)
Fixed on the base (3) is installed a pressure sensor; differential (5) one of the faces of which is brought into contact with the barometric pressure by a tube going to the surface (6) the other face is connected to a valve box (7) bringing it in turn into contact with ambient water either with the high reference column (8) or with the low reference column (9).
Les mesures de pression faitess par la capteur sont transmises par cable (10) å un appareil de mesure électronique (11) qui va les analyser,les traiter,les enregistrer et commander les séquences de travail du système. The pressure measurements made by the sensor are transmitted by cable (10) to an electronic measuring device (11) which will analyze them, process them, record them and order the work sequences of the system.
Ce peut etre avantageusement un ordinateur d'acquisition des données chargé de faire les mesures de référence, et les mesures de niveaux, de les corriger en fonction des mesures de références,et de les dater, de piloter les electrovannes et de stocker les informations sur mémoires, diskettes ou bandes magnétiques ou 4e préparer et gerer des messages de télémesure. It can advantageously be a data acquisition computer responsible for making the reference measurements, and the level measurements, for correcting them according to the reference measurements, and for dating them, for controlling the solenoid valves and for storing the information on memories, diskettes or magnetic tapes or 4th prepare and manage telemetry messages.
L'installation peut etre etre complétée par un systeme de pompage d'eau filtrée évitant ainsi 1 l'envasement de l'installation.The installation can be supplemented by a filtered water pumping system thus avoiding siltation of the installation.
Dans ce cas nous voyons un tube (12) allant en mer,ou ailleurs, d'ou l'eau est amenée par la pompe 113) arrivant a n bac de décantation (14) et de la par le tube (15) au puits de mesure
Afin d'éviter la proliferation de la faune et de la flore un léger débit d'eau de javel ou autre produit équivalent est déversé régulierement dans le puits
L'installation peut fonctionner grace a des paneaux solaires
d'éliminer l'effet de la houle,la mesure peut etre prolongée pendant un temps suffisant pour intégrer les variations de pressions et en éliminer les effets
Les operations décrites pourraient etre réalisées manuellement
sans que l'invention change de sens
La figure II represente schematîquement le systeme afin de clairement expliquer le jeu des clapets ou electrovannes contenues dans la boite a clapets (7)
La boîte à clapets (7) contient 3 électrovannes ( (17) et (18) commandées par la centrale électrique (lt) depuis la surface.In this case we see a tube (12) going to the sea, or elsewhere, from where the water is brought by the pump 113) arriving at the settling tank (14) and from there by the tube (15) to the well of measured
In order to avoid the proliferation of fauna and flora, a slight flow of bleach or other equivalent product is regularly poured into the well.
The installation can operate thanks to solar panels
to eliminate the swell effect, the measurement can be extended for a time sufficient to integrate the pressure variations and eliminate the effects
The operations described could be carried out manually
without the invention changing its meaning
Figure II schematically represents the system in order to clearly explain the play of the valves or solenoid valves contained in the valve box (7)
The valve box (7) contains 3 solenoid valves ((17) and (18) controlled by the power station (lt) from the surface.
Ces électrovannes pourraient d'ailleurs très facilement etre remplacées par des clapets commandés par un arbre a cames entrainé par un moteur ou manuellement. These solenoid valves could moreover very easily be replaced by valves controlled by a camshaft driven by a motor or manually.
Le niveau de l'eau dans le puits (1) peut varier au rythme des marées ou des chanqements de niveau transmis par la tubulure de mise a la mer (2)
Le capteur de pression (5) est raccorda au > cois les de référence (8) et (9) qui elles-memes sont racco@ dées aux électrovannes (16) (17) et (18).The level of the water in the well (1) can vary with the rhythm of the tides or changes in level transmitted by the tube to the sea (2)
The pressure sensor (5) is connected to the> reference points (8) and (9) which themselves are connected to the solenoid valves (16) (17) and (18).
Les électrovannes étant toutes ouvertes,la face active du capteur de pression est en communication directe avec l'eau ambiante, d'autre part son autre face étant en communication grace au tuyau (6) avec la pression atmosphérique, c'est bien la colonne d'eau qui surmonte le capteur qui crée la pression mesurée par celui-ci a l'exclusion de tout effet de la pression atmosphérique ,celle ci ' s'exercant de facon égale sur ses 2 faces d'une part dirrectement par la prise de pression d'air,d'autre part par l'intermediaire de la surface du liquide sur la quelle elle pèse uniformément. The solenoid valves being all open, the active face of the pressure sensor is in direct communication with the ambient water, on the other hand its other face being in communication thanks to the pipe (6) with atmospheric pressure, it is the column of water which surmounts the sensor which creates the pressure measured by the latter to the exclusion of any effect of atmospheric pressure, this being exerted equally on its 2 faces on the one hand directly by taking air pressure, on the other hand via the surface of the liquid on which it weighs uniformly.
Si par l'effet de la marée ou d'un remplissage artificiel le niveau de l'eau dépasse la tranche supérieure du tube de référence (8) que 1 l'on commande la fermeture des clapets ou électrovannes (16) et (18) et que l'on laisse baisser le niveau de l'eau soit artificiellement 'soit qu'il s agisse d'une variation naturel le comme le mouvement de la marée, les clapets (16) et 118) étant fermés, le tube de référence (8) restera plein a ras bord et le capteur de pression mesurera la pression causez par la colonne d'eau contenue dans ce tube de longueur parfaitement connue, quelle que soit la densité DU la température de l'eau ou du fluide. If by the effect of the tide or an artificial filling the water level exceeds the upper edge of the reference tube (8) that 1 the valves or solenoid valves (16) and (18) are closed and let the water level drop either artificially or because it is a natural variation such as the movement of the tide, the valves (16) and 118) being closed, the reference tube (8) will remain full to the brim and the pressure sensor will measure the pressure caused by the column of water contained in this tube of perfectly known length, whatever the density DU the temperature of the water or the fluid.
Cette mesure servira de référence N 1 pour l'étalonnage du capteur de pression et d système lul-meme. This measurement will serve as reference N 1 for the calibration of the pressure sensor and of the system itself.
Cette mesure étant faite les électrovannes (16) (17) et (18) étant ouvertes, les mesures du niveau libre de l'eau pourront se poursuivre. This measurement being made, the solenoid valves (16) (17) and (18) being open, the measurements of the free water level can continue.
Le niveau continuant à baisser a l'approche du tube de référence inférieure (9) 1' électrovanne (17) sera fermée le niveau descendant toujours. Le tube (9) restera plein à ras bord et le capter mesurera la pression de la colonne d'eau de hauteur parfaitement connue contenue dans ce tube (9). As the level continues to drop as the lower reference tube (9) approaches, the solenoid valve (17) will be closed, the level still falling. The tube (9) will remain full to the brim and the sensor will measure the pressure of the water column of perfectly known height contained in this tube (9).
Cette deuxième mesure constituera la référence N" 2'
Disposant maintenant de 2 références de pression correspondant à des niveaux géométriquement connus, indépendants de la pression barométrique, des facteurs de température ou de densité du fluide à mesurer , cs 2 références vont constituer les 2 points d'étalonnage de la courbe du capteur de pression. This second measurement will constitute the reference N "2 '
Now having 2 pressure references corresponding to geometrically known levels, independent of the barometric pressure, temperature or density factors of the fluid to be measured, these 2 references will constitute the 2 calibration points of the pressure sensor curve .
Ces 7 valeurs étant introduites dans une table de calcul, toutes les mesures de pression du niveau libre de l'eau pourront etre corrigées par la table étalonnée
Il est important ici de remarquer que toutes les mesures étant comparées a 2 références géométriques, les dérives éventuelles du capteur, les variations des conditions physiques extérieures restent sans influence et sont périodiquement corrigées
Sur le plan pratique il est à noter - que les tubes de référence (8) et (9) et le capteur (7) doivent etre parfaitement solidaires de la base (3) et en suivre les éventuel s mouvements - que les tubes (8) et (9) sont construits dans un matériau les mettant eux mèmes à l'abri des variations de température tel que 1 'invar,le quartz ou autre.These 7 values being entered in a calculation table, all the pressure measurements of the free water level can be corrected by the calibrated table
It is important here to note that all the measurements being compared to 2 geometric references, the possible drifts of the sensor, the variations of the external physical conditions remain without influence and are periodically corrected
On a practical level it should be noted - that the reference tubes (8) and (9) and the sensor (7) must be perfectly integral with the base (3) and follow any movements therefrom - that the tubes (8 ) and (9) are constructed from a material that shelters them from temperature variations such as invar, quartz or the like.
En résume l'invention porte essentiellement sur une methode permettant d'étalonner periodiquement un systeme de mesure de niveau de liquide par pression hydrostatique,en mesurant la pression régnant dans des tubes de longueur connue contenant le meme liquide que celui a mesurer
Les mesures de référence ainsi obtenues servent de base a l'échelle des mesures
Cet étalonnage periodique du systeme par comparaison a un phénomene purement physique,permet d'éliminer les problemes de dérive du capteur de pression,de variation des conditions de l'environnement tels que variations de densité du fluide ,de sa temperature,ou variation de la pression atmospherique. In summary, the invention relates essentially to a method for periodically calibrating a liquid level measurement system by hydrostatic pressure, by measuring the pressure prevailing in tubes of known length containing the same liquid as that to be measured.
The reference measurements thus obtained serve as a basis for the measurement scale
This periodic calibration of the system by comparison with a purely physical phenomenon makes it possible to eliminate the problems of drift of the pressure sensor, of variation of the environmental conditions such as variations in density of the fluid, its temperature, or variation in the atmospheric pressure.
Claims (11)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8408482A FR2564969A1 (en) | 1984-05-28 | 1984-05-28 | System for hydrostatic measurement of the level of liquid, such as recording tides, capable of being periodically calibrated by comparison with columns of liquid of the same nature acting as a reference assuring millimetre accuracy and reliability |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8408482A FR2564969A1 (en) | 1984-05-28 | 1984-05-28 | System for hydrostatic measurement of the level of liquid, such as recording tides, capable of being periodically calibrated by comparison with columns of liquid of the same nature acting as a reference assuring millimetre accuracy and reliability |
Publications (1)
Publication Number | Publication Date |
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FR2564969A1 true FR2564969A1 (en) | 1985-11-29 |
Family
ID=9304537
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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FR8408482A Withdrawn FR2564969A1 (en) | 1984-05-28 | 1984-05-28 | System for hydrostatic measurement of the level of liquid, such as recording tides, capable of being periodically calibrated by comparison with columns of liquid of the same nature acting as a reference assuring millimetre accuracy and reliability |
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FR (1) | FR2564969A1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2738629A1 (en) * | 1995-09-07 | 1997-03-14 | Quantitec Sarl | Weir water level measuring device |
FR2741966A1 (en) * | 1995-10-09 | 1997-06-06 | Vaichere Luc | Tide level indicator |
CN103712647A (en) * | 2013-10-09 | 2014-04-09 | 山东科技大学 | Three-dimensional seepage flow field monitoring device |
CN105157784A (en) * | 2015-09-30 | 2015-12-16 | 山东省科学院海洋仪器仪表研究所 | Tide level detection system and method based on buoy communication |
CN109238229A (en) * | 2018-11-12 | 2019-01-18 | 东北大学 | A kind of temperature-compensation method of the ground settlement value based on hydrostatic level monitoring |
US20210310848A1 (en) * | 2015-10-01 | 2021-10-07 | Independent Technologies, Llc | Closed tank fill level sensor |
EP4001526A1 (en) * | 2020-11-20 | 2022-05-25 | Oli - Sistemas Sanitarios, S.A. | Level sensor unit for level measurements in a flushing tank |
IT202100011093A1 (en) * | 2021-04-30 | 2022-10-30 | Watgrid Sa | MONITORING SYSTEM FOR THE DETECTION OF THE LIQUID LEVEL IN A TANK |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2532940A (en) * | 1946-11-16 | 1950-12-05 | Sun Oil Co | Liquid seal level gauge |
US3250123A (en) * | 1964-02-20 | 1966-05-10 | Honeywell Inc | Liquid level measuring apparatus |
GB1124961A (en) * | 1965-05-03 | 1968-08-21 | Elliott Brothers London Ltd | Improvements in or relating to apparatus for water level measurement in pressure vessels |
JPS53145673A (en) * | 1977-05-25 | 1978-12-19 | Hitachi Ltd | Level measuring system |
EP0048589A1 (en) * | 1980-09-19 | 1982-03-31 | Tankmaster Limited | Tank contents gauge |
-
1984
- 1984-05-28 FR FR8408482A patent/FR2564969A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2532940A (en) * | 1946-11-16 | 1950-12-05 | Sun Oil Co | Liquid seal level gauge |
US3250123A (en) * | 1964-02-20 | 1966-05-10 | Honeywell Inc | Liquid level measuring apparatus |
GB1124961A (en) * | 1965-05-03 | 1968-08-21 | Elliott Brothers London Ltd | Improvements in or relating to apparatus for water level measurement in pressure vessels |
JPS53145673A (en) * | 1977-05-25 | 1978-12-19 | Hitachi Ltd | Level measuring system |
EP0048589A1 (en) * | 1980-09-19 | 1982-03-31 | Tankmaster Limited | Tank contents gauge |
Non-Patent Citations (1)
Title |
---|
PATENTS ABSTRACTS OF JAPAN, vol. 3, no. 18 (E-91), 16 février 1979, page 25-E91; & JP - A - 53 145673 (HITACHI SEISAKUSHO K.K.) 19-12-1978 * |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2738629A1 (en) * | 1995-09-07 | 1997-03-14 | Quantitec Sarl | Weir water level measuring device |
FR2741966A1 (en) * | 1995-10-09 | 1997-06-06 | Vaichere Luc | Tide level indicator |
CN103712647A (en) * | 2013-10-09 | 2014-04-09 | 山东科技大学 | Three-dimensional seepage flow field monitoring device |
CN103712647B (en) * | 2013-10-09 | 2016-08-17 | 山东科技大学 | A kind of three-dimensional seepage flow field monitoring device |
CN105157784A (en) * | 2015-09-30 | 2015-12-16 | 山东省科学院海洋仪器仪表研究所 | Tide level detection system and method based on buoy communication |
US20210310848A1 (en) * | 2015-10-01 | 2021-10-07 | Independent Technologies, Llc | Closed tank fill level sensor |
CN109238229A (en) * | 2018-11-12 | 2019-01-18 | 东北大学 | A kind of temperature-compensation method of the ground settlement value based on hydrostatic level monitoring |
CN109238229B (en) * | 2018-11-12 | 2020-10-30 | 东北大学 | Temperature compensation method for surface subsidence value based on hydrostatic level monitoring |
EP4001526A1 (en) * | 2020-11-20 | 2022-05-25 | Oli - Sistemas Sanitarios, S.A. | Level sensor unit for level measurements in a flushing tank |
IT202100011093A1 (en) * | 2021-04-30 | 2022-10-30 | Watgrid Sa | MONITORING SYSTEM FOR THE DETECTION OF THE LIQUID LEVEL IN A TANK |
EP4083582A1 (en) * | 2021-04-30 | 2022-11-02 | Watgrid, SA | A monitoring system for liquid level detection in a tank |
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