WO2008065112A1 - Inductive conductivity sensor - Google Patents
Inductive conductivity sensor Download PDFInfo
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- WO2008065112A1 WO2008065112A1 PCT/EP2007/062887 EP2007062887W WO2008065112A1 WO 2008065112 A1 WO2008065112 A1 WO 2008065112A1 EP 2007062887 W EP2007062887 W EP 2007062887W WO 2008065112 A1 WO2008065112 A1 WO 2008065112A1
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- conductivity sensor
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- receiving
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/023—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance where the material is placed in the field of a coil
Definitions
- the present invention relates to an inductive conductivity sensor for determining the conductivity of a liquid medium.
- Inductive conductivity sensors essentially comprise one
- Double transformer with a mostly annular transmitting coil and a generally annular receiving coil, a Kurz practitionerpfad with the medium to be measured, which passes through the transmitting coil and the receiving coil, a transmitting coil electrically connected to the transmitting means for supplying the coil with an AC voltage and electrically connected to the receiving coil receiving device.
- Such conductivity sensors are for example in the
- Inductive conductivity sensors have a typical measuring range of about 20 ⁇ S / cm to 2 S / cm.
- the measuring range at low conductivities is limited by the fact that the signals of the receiving coil are very small and are superimposed by the residual coupling signal (output signal without medium).
- the residual coupling signal is in particular composed of a capacitive coupling of the leads and an inductive coupling of the coils.
- the output signal can be amplified by a higher input voltage, the higher input voltage is also associated with a larger capacitive coupling and a larger transmit coil current with a larger inductive coupling.
- the present invention is therefore based on the object to provide a conductivity sensor, which overcomes the disadvantages of the prior art.
- the object is achieved by the conductivity sensor according to the independent claim 1.
- the conductivity sensor according to the invention for detecting the conductivity of a liquid medium comprises a double transformer, with a preferably annular transmitting coil and a preferably annular receiving coil, a short-circuit path formed in the measuring operation by the medium to be measured, which passes through the transmitting coil and the receiving coil, a transmitting coil electrically connected to the transmitting means for feeding the transmitting coil with an AC voltage, and one electrically connected to the receiving coil Receiving device, wherein the transmitting coil and / or the receiving coil have or have a switchable number of turns.
- the number of turns refers to the respective connected turns of the coils, which are traversed by the excited in the transmitting device or by the detected in the receiving device current.
- the receiving coil has a switchable number of turns, whereby the turns ratio between the transmitting coil and the receiving coil, for example, from about 1: 1 to not less than about 2: 1, preferably not less than about 3: 1, and, more preferably, not less than about 4: 1 switchable to detect the conductivity of low conductivity media.
- the number of turns of the transmitting coil for example, 20 to 250
- Windings amount In a presently preferred embodiment, the number of turns of the primary coil is about 120 turns.
- the number of turns of the receiving coil arise in accordance with the above conditions.
- Switching between the various numbers of turns is preferably carried out depending on the measuring range via an electronic switch by switching between appropriately provided Spulenabgriffen, which are assigned to the number of turns.
- each Spulenabgriff initially an I-U converter are supplied, wherein the selection of the voltage signal to be exploited by an electronic switch, which is arranged downstream of the I-U converters.
- the receiving device can for this purpose according to a Embodiment of the invention comprise a control circuit which controls the electronic switch measuring range dependent.
- Reception coil between more than two values in particular three values for the number of turns can be switched.
- the turns of the two coils are annular or annular section-shaped, wherein the turns each extend around an annular magnetic core.
- the turns can actually be created by winding a continuous wire, or by connecting individual conductor sections on printed circuit boards with plated-through holes, as disclosed in the still unpublished patent application no. 102006025194.
- annular refers to a coil with a self-contained magnetic path, so if a magnetic core is provided, it must be self-contained, the shape of the ring does not matter, a circular ring is the simplest However, any other shapes are conceivable, in particular ellipses, rectangles or other polygons
- the turns do not have to be distributed homogeneously over the magnetic core They can be distributed with different number of windings over the annular magnetic core and in particular limited to a section of the magnetic core.
- the transmitting device can advantageously be operated at a substantially constant transmission frequency, which corresponds for example to the resonant frequency of the transmitting coil in the measuring circuit.
- the transmitter may include frequency control to adjust the exciter frequency to the actual resonant frequency.
- the transmission frequency may generally be between about 100 Hz and 40 kHz, preferably between 500 Hz and 20 kHz and more preferably 1 kHz to 10 kHz.
- the number of turns of the transmitting coil is made switchable, it is currently preferred to adapt the transmission frequency of the transmitting device to the winding speed-dependent resonant frequency of the transmitting coil.
- Fig. 1 a schematic representation of a conductivity sensor according to the invention.
- the inductive conductivity sensor shown in Fig. 1 comprises a transmitting coil 2 with 120 turns, which are wound around a first annular ferrite core 3.
- the transmitting coil 3 is excited by a transmitting device 4 with an alternating voltage of a frequency which corresponds approximately to the resonant frequency of the transmitting coil in the transmitting device.
- Coaxial with the transmitting coil 2 is a receiving coil 5 with a
- Total wind number of 120 turns also arranged, which are wound around a second annular magnetic core 6.
- the induced current in the receiving coil can be evaluated by a receiving circuit 7.
- the openings of the annular coil cores are penetrated by the medium to be examined, which forms a short-circuit path 8.
- the resistance R Med ⁇ um of the medium can be determined according to where l receive the induced current in the receiver coil, U transmit the excitation voltage at the transmitter coil, N transmit the number of current-carrying turns of the transmitter coil, and N receive the number of current-carrying turns of the receiver coil. Accordingly, for a given media resistance:
- the receiving coil 5 comprises an initial tap 10 and an end tap 11, between which all 120 turns of the receiving coil 5 extend.
- the coil further comprises an intermediate tap 12 after 30 turns.
- the control of the switch 14, for example, automatically carried out in dependence of the measured induced current from the receiving device 14.
Abstract
A conductivity sensor (1) comprises a dual transformer having a transmitting coil (2), a short-circuit path (8) and a receiving coil (5); wherein the short-circuit path (8) formed during measurement operation passes through the medium to be measured, the transmitting coil (2) and the receiving coil (5); a transmitting device (4) which is electrically connected to the transmitting coil (2) and is intended to feed an AC voltage to the transmitting coil; and a receiving device (7) which is electrically connected to the receiving coil (5), wherein the transmitting coil (2) and/or the receiving coil (5) also has/have a switchable number of turns.
Description
Beschreibung description
Induktiver Leitfähigkeitssensor:Inductive conductivity sensor:
[0001] Die vorliegende Erfindung betrifft einen induktiven Leitfähigkeitssensor zum bestimmen der Leitfähigkeit eines flüssigen Mediums.The present invention relates to an inductive conductivity sensor for determining the conductivity of a liquid medium.
[0002] Induktive Leitfähigkeitssensoren umfassen im Wesentlichen einenInductive conductivity sensors essentially comprise one
Doppeltransformator, mit einer meist ringförmigen Sendespule und einer meist ringförmigen Empfangsspule, einen Kurzschlusspfad mit dem zu messenden Medium, der die Sendespule und die Empfangsspule durchsetzt, eine mit der Sendespule elektrisch verbundene Sendeeinrichtung zum Speisen der Spule mit einer Wechselspannung und eine mit der Empfangsspule elektrisch verbundenen Empfangseinrichtung.Double transformer, with a mostly annular transmitting coil and a generally annular receiving coil, a Kurzschlusspfad with the medium to be measured, which passes through the transmitting coil and the receiving coil, a transmitting coil electrically connected to the transmitting means for supplying the coil with an AC voltage and electrically connected to the receiving coil receiving device.
[0003] Derartige Leitfähigkeitssensoren sind beispielsweise in denSuch conductivity sensors are for example in the
Offenlegungsschriften DE 198 51 146 und DE 41 16 468 sowie in dem U.S. Patent Nr. 6,414,493 offenbart.Laid-Open Publications DE 198 51 146 and DE 41 16 468 and in U.S. Pat. Patent No. 6,414,493.
[0004] Induktive Leitfähigkeitssensoren weisen einen typischen Messbereich von etwa 20 μS/cm bis 2 S/cm auf. Der Messbereich bei geringen Leitfähigkeiten ist dadurch beschränkt, dass die Signale der Empfangsspule sehr gering sind und vom Restkopplungssignal (Ausgabesignal ohne Medium) überlagert werden. Das Restkopplungssignal setzt sich insbesondere zusammen aus einer kapazitiven Kopplung der Zuleitungen und einer induktiven Kopplung der Spulen. Das Ausgangssignal kann zwar durch eine höhere Eingangsspannung verstärkt werden, aber die höhere Eingangsspannung geht auch mit einer größeren kapazitiven Kopplung und über einen größeren Sendespulenstrom mit einer größeren induktiven Kopplung einher.Inductive conductivity sensors have a typical measuring range of about 20 μS / cm to 2 S / cm. The measuring range at low conductivities is limited by the fact that the signals of the receiving coil are very small and are superimposed by the residual coupling signal (output signal without medium). The residual coupling signal is in particular composed of a capacitive coupling of the leads and an inductive coupling of the coils. Although the output signal can be amplified by a higher input voltage, the higher input voltage is also associated with a larger capacitive coupling and a larger transmit coil current with a larger inductive coupling.
[0005] Der vorliegenden Erfindung liegt somit die Aufgabe zugrunde, einen Leitfähigkeitssensor bereitzustellen, der die Nachteile des Stands der Technik überwindet.The present invention is therefore based on the object to provide a conductivity sensor, which overcomes the disadvantages of the prior art.
[0006] Die Aufgabe wird erfindungsgemäß gelöst durch den Leitfähigkeitssensor gemäß des unabhängigen Patentanspruchs 1.The object is achieved by the conductivity sensor according to the independent claim 1.
[0007] Der erfindungsgemäße Leitfähigkeitssensor zum Erfassen der Leitfähigkeit eines flüssigen Mediums umfasst einen Doppeltransformator, mit einer
vorzugsweise ringförmigen Sendespule und einer vorzugsweise ringförmigen Empfangsspule, einen im Messbetrieb gebildeten Kurzschlusspfad durch das zu messende Medium, der die Sendespule und die Empfangsspule durchsetzt, eine mit der Sendespule elektrisch verbundene Sendeeinrichtung zum Speisen der Sendespule mit einer Wechselspannung, und eine mit der Empfangsspule elektrisch verbundenen Empfangseinrichtung, wobei die Sendespule und/oder die Empfangsspule eine umschaltbare Windungszahl aufweisen bzw. aufweist.The conductivity sensor according to the invention for detecting the conductivity of a liquid medium comprises a double transformer, with a preferably annular transmitting coil and a preferably annular receiving coil, a short-circuit path formed in the measuring operation by the medium to be measured, which passes through the transmitting coil and the receiving coil, a transmitting coil electrically connected to the transmitting means for feeding the transmitting coil with an AC voltage, and one electrically connected to the receiving coil Receiving device, wherein the transmitting coil and / or the receiving coil have or have a switchable number of turns.
[0008] Die Windungszahl bezieht sich auf die jeweils geschalteten Windungen der Spulen, die von dem in der Sendeeinrichtung angeregten bzw. von dem in der Empfangseinrichtung erfassten Strom durchflössen werden.The number of turns refers to the respective connected turns of the coils, which are traversed by the excited in the transmitting device or by the detected in the receiving device current.
[0009] In einer derzeit bevorzugten Ausgestaltung der Erfindung weist die Empfangsspule eine umschaltbare Windungszahl auf, womit das Windungszahlenverhältnis zwischen Sendespule und Empfangsspule beispielsweise von etwa 1 : 1 auf nicht weniger als etwa 2: 1 , vorzugsweise auf nicht weniger als etwa 3:1 , und besonders bevorzugt auf nicht weniger als etwa 4:1 umschaltbar, um die Leitfähigkeit von Medien geringer Leitfähigkeit zu erfassen.In a presently preferred embodiment of the invention, the receiving coil has a switchable number of turns, whereby the turns ratio between the transmitting coil and the receiving coil, for example, from about 1: 1 to not less than about 2: 1, preferably not less than about 3: 1, and, more preferably, not less than about 4: 1 switchable to detect the conductivity of low conductivity media.
[0010] Die Windungszahl der Sendespule kann beispielsweise 20 bis 250The number of turns of the transmitting coil, for example, 20 to 250
Windungen betragen In einer derzeit bevorzugten Ausgestaltung beträgt die Windungszahl der Primärspule etwa 120 Windungen.Windings amount In a presently preferred embodiment, the number of turns of the primary coil is about 120 turns.
[0011] Die Windungszahlen der Empfangsspule ergeben sich entsprechend aus den obigen Verhältnissen.The number of turns of the receiving coil arise in accordance with the above conditions.
[0012] Das Umschalten zwischen den verschiedenen Windungszahlen erfolgt vorzugsweise messbereichsabhängig über einen elektronischen Schalter durch Umschalten zwischen entsprechend vorgesehenen Spulenabgriffen, die den Windungszahlen zugeordnet sind.Switching between the various numbers of turns is preferably carried out depending on the measuring range via an electronic switch by switching between appropriately provided Spulenabgriffen, which are assigned to the number of turns.
[0013] Wahlweise kann jeder Spulenabgriff zunächst einem I-U-Wandler zugeführt werden, wobei die Auswahl des zu verwertenden Spannungssignals durch einen elektronischen Schalter erfolgt, der den I-U-Wandlern nachgeordnet ist.Optionally, each Spulenabgriff initially an I-U converter are supplied, wherein the selection of the voltage signal to be exploited by an electronic switch, which is arranged downstream of the I-U converters.
[0014] Die Empfangseinrichtung kann zu diesem Zweck gemäß einer
Ausgestaltung der Erfindung eine Steuerschaltung umfassen, welche den elektronischen Schalter messbereichsabhängig steuert.The receiving device can for this purpose according to a Embodiment of the invention comprise a control circuit which controls the electronic switch measuring range dependent.
[0015] In einer Weiterbildung der Erfindung ist die Windungszahl derIn one embodiment of the invention, the number of turns of
Empfangsspule zwischen mehr als zwei Werten insbesondere drei Werten für die Windungszahl umschaltbar.Reception coil between more than two values in particular three values for the number of turns can be switched.
[0016] In einer derzeit bevorzugten Ausgestaltung der Erfindung sind die Windungen der beiden Spulen ringförmig oder ringabschnittförmig aufgebaut, wobei die Windungen jeweils um einen ringförmigen Magnetkern verlaufen. Die Windungen können dabei tatsächlich durch Wickeln eines kontinuierlichen Drahtes, oder durch Verbinden einzelner Leiterabschnitte auf Leiterplatten mit Durchkontaktierungen erstellt sein, wie in der noch unveröffentlichten Patentanmeldung Nr. 102006025194 offenbart ist.In a presently preferred embodiment of the invention, the turns of the two coils are annular or annular section-shaped, wherein the turns each extend around an annular magnetic core. The turns can actually be created by winding a continuous wire, or by connecting individual conductor sections on printed circuit boards with plated-through holes, as disclosed in the still unpublished patent application no. 102006025194.
[0017] Der Begriff „ringförmig" bezeichnet eine Spule mit einem in sich geschlossenen magnetischen Pfad. Wenn also ein Magnetkern vorgesehen ist, muss dieser in sich geschlossen verlaufen. Auf die Gestalt kommt des ringförmigen Verlaufs kommt es nicht an. Ein Kreisring ist die einfachste Form gleichermaßen sind aber auch beliebige andere Formen denkbar, insbesondere Ellipsen, Rechtecke oder andere Polygone. Die Windungen müssen nicht homogen über den Magnetkern verteilt sein. Sie können mit unterschiedlicher Windungszahldichte über den ringförmigen Magnetkern verteilt sein und insbesondere auf einen Abschnitt des Magnetkerns beschränkt sein.The term "annular" refers to a coil with a self-contained magnetic path, so if a magnetic core is provided, it must be self-contained, the shape of the ring does not matter, a circular ring is the simplest However, any other shapes are conceivable, in particular ellipses, rectangles or other polygons The turns do not have to be distributed homogeneously over the magnetic core They can be distributed with different number of windings over the annular magnetic core and in particular limited to a section of the magnetic core.
[0018] In den zuvor beschriebenen Ausgestaltungen der Erfindung kann die Sendeeinrichtung vorteilhaft auf einer im Wesentlichen konstanten Sendefrequenz betrieben werden, welche beispielsweise der Resonanzfrequenz der Sendespule in der Messschaltung entspricht. Die Sendeeinrichtung kann eine Frequenzsteuerung umfassen, um die Erregerfrequenz auf die tatsächliche Resonanzfrequenz einzuregeln.In the previously described embodiments of the invention, the transmitting device can advantageously be operated at a substantially constant transmission frequency, which corresponds for example to the resonant frequency of the transmitting coil in the measuring circuit. The transmitter may include frequency control to adjust the exciter frequency to the actual resonant frequency.
[0019] Die Sendefrequenz kann allgemein zwischen etwa 100 Hz und 40 kHz, vorzugsweise zwischen 500 Hz und 20 kHz und besonders bevorzugt 1 kHz bis 10 kHz betragen.The transmission frequency may generally be between about 100 Hz and 40 kHz, preferably between 500 Hz and 20 kHz and more preferably 1 kHz to 10 kHz.
[0020] Wenn die Windungszahl der Sendespule umschaltbar gestaltet wird, ist es
derzeit bevorzugt, die Sendefrequenz der Sendeeinrichtung an die windungszahlabhängige Resonanzfrequenz der Sendespule anzupassen.If the number of turns of the transmitting coil is made switchable, it is currently preferred to adapt the transmission frequency of the transmitting device to the winding speed-dependent resonant frequency of the transmitting coil.
[0021] Die Erfindung wird nun anhand eines in der Zeichnung dargestellten Ausführungsbeispiels erläutert. Es zeigt:The invention will now be explained with reference to an embodiment shown in the drawing. It shows:
[0022] Fig. 1 : eine schematische Darstellung eines erfindungsgemäßen Leitfähigkeitssensors.Fig. 1: a schematic representation of a conductivity sensor according to the invention.
[0023] Der in Fig. 1 dargestellte induktive Leitfähigkeitssensor umfasst eine Sendespule 2 mit 120 Windungen, die um einen ersten ringförmigen Ferritkern 3 gewickelt sind. Die Sendespule 3 wird von einer Sendeeinrichtung 4 mit einer Wechselspannung einer Frequenz angeregt, die etwa der Resonanzfrequenz der Sendespule in der Sendeeinrichtung entspricht.The inductive conductivity sensor shown in Fig. 1 comprises a transmitting coil 2 with 120 turns, which are wound around a first annular ferrite core 3. The transmitting coil 3 is excited by a transmitting device 4 with an alternating voltage of a frequency which corresponds approximately to the resonant frequency of the transmitting coil in the transmitting device.
[0024] Koaxial zu der Sendespule 2 ist eine Empfangsspule 5 mit einerCoaxial with the transmitting coil 2 is a receiving coil 5 with a
Gesamtwindungszahl von ebenfalls 120 Windungen angeordnet, die um einen zweiten ringförmigen Magnetkern 6 gewickelt sind. Der in der Empfangsspule induzierte Strom kann mit einer Empfangsschaltung 7 ausgewertet werden.Total wind number of 120 turns also arranged, which are wound around a second annular magnetic core 6. The induced current in the receiving coil can be evaluated by a receiving circuit 7.
[0025] Im Messbetrieb sind die Öffnungen der ringförmigen Spulenkerne von dem zu untersuchenden Medium durchdrungen, welches einen Kurzschlusspfad 8 bildet.In measuring operation, the openings of the annular coil cores are penetrated by the medium to be examined, which forms a short-circuit path 8.
[0026] Anhand des gemessenen Stroms kann der Widerstand RMedιum des Mediums bestimmt werden gemäß
wobei lEmpfang der induzierte Strom in der Empfangsspule, USende die Erregerspannung an der Sendespule, NSende die Zahl der stromdurchflossenen Windungen der Sendespule, und NEmpfang die Zahl der stromdurchflossenen Windungen der Empfangsspule ist. [0027] Entsprechend gilt bei einem gegebenem Medienwiderstand:Based on the measured current, the resistance R Medιum of the medium can be determined according to where l receive the induced current in the receiver coil, U transmit the excitation voltage at the transmitter coil, N transmit the number of current-carrying turns of the transmitter coil, and N receive the number of current-carrying turns of the receiver coil. Accordingly, for a given media resistance:
K\leώmn Λ Sende ' ' V im/)/M? K \ leώmn Λ Send ' ' V in / ) / M ?
Wenn nun der Widerstand des Mediums größer wird, sinkt der induzierte Strom in der Empfangsspule so weit, dass die relative Bedeutung von
Störgrößen zunimmt. Durch die Verringerung der Zahl der Stromdurchflossenen Windungen in der Empfangsspule NEmpfang kann dieser Effekt zumindest teilweise kompensiert werden.As the resistance of the medium increases, the induced current in the receiver coil decreases so much that the relative importance of Disturbances increases. By reducing the number of current-carrying turns in the receiving coil N reception , this effect can be at least partially compensated.
[0028] Um dieses zu ermöglichen, umfasst die Empfangsspule 5 gemäß des Ausführungsbeispiels einen Anfangsabgriff 10 und einen Endabgriff 11 , zwischen denen alle 120 Windungen der Empfangsspule 5 verlaufen. Die Spule umfasst weiterhin einen Zwischenabgriff 12 nach 30 Windungen.In order to make this possible, the receiving coil 5 according to the embodiment comprises an initial tap 10 and an end tap 11, between which all 120 turns of the receiving coil 5 extend. The coil further comprises an intermediate tap 12 after 30 turns.
[0029] Mittels eines elektronischen Schalters 14, kann zwischen demBy means of an electronic switch 14, can between the
Zwischenabgriff 12 und dem Endabgriff 11 umgeschaltet werden.Between tap 12 and the Endabgriff 11 are switched.
[0030] Die Steuerung des Schalters 14 kann beispielsweise automatisiert in Abhängigkeit des gemessenen induzierten Stroms von der Empfangseinrichtung 14 erfolgen. Dies bedeutet, dass im oberen Messbereich des Leitfähigkeitssensors das Windungszahlverhältnis NSende :NEmpfang zunächst 1 :1 beträgt, und dass bei Sinken der Leitfähigkeit unter einen Schwellwert NSende:NEmpfang auf 4:1 umgeschaltet wird.
The control of the switch 14, for example, automatically carried out in dependence of the measured induced current from the receiving device 14. This means that the turns ratio N transmit in the upper measuring range of the conductivity sensor: N receive initially 1: 1, and that at the end of decrease in the conductivity falls below a threshold value N S: N E mpfang to 4: is switched. 1
Claims
1. 1. Leitfähigkeitssensor (1) zum Erfassen der Leitfähigkeit eines flüssigen Mediums, umfassend einen Doppeltransformator mit einer Sendespule (2), einem Kurzschlusspfad1. A conductivity sensor (1) for detecting the conductivity of a liquid medium, comprising a double transformer with a transmitting coil (2), a short circuit path
(8) und einer Empfangsspule (5); wobei der im Messbetrieb gebildete Kurzschlusspfad (8) durch das zu messende Medium, die Sendespule (2) und die Empfangsspule (5) durchsetzt; eine mit der Sendespule (2) elektrisch verbundene Sendeeinrichtung (4) zum(8) and a receiving coil (5); wherein the short-circuit path (8) formed in the measuring operation passes through the medium to be measured, the transmitting coil (2) and the receiving coil (5); a transmitting device (4) electrically connected to the transmitting coil (2) for
Speisen der Sendespule mit einer Wechselspannung; und eine mit der Empfangsspule (5) elektrisch verbundene EmpfangseinrichtungFeeding the transmitting coil with an alternating voltage; and a receiving means electrically connected to the receiving coil (5)
(7), dadurch gekennzeichnet, dass die Sendespule (2) und/oder die Empfangsspule (5) eine umschaltbare(7), characterized in that the transmitting coil (2) and / or the receiving coil (5) has a switchable
Windungszahl aufweisen bzw. aufweist.Have or number of turns.
2. 2. Leitfähigkeitssensor, nach Anspruch 1 , wobei die Empfangsspule eine umschaltbare Windungszahl aufweist.2. 2. Conductivity sensor according to claim 1, wherein the receiving coil has a switchable number of turns.
3. 3. Leitfähigkeitssensor, nach Anspruch 2, wobei das Windungszahlenverhältnis zwischen Sendespule (2) und Empfangsspule (5) von etwa 1 :1 auf nicht weniger als etwa 2:1 , vorzugsweise auf nicht weniger als etwa 3:1 , und besonders bevorzugt auf nicht weniger als etwa 4:1 umschaltbar ist.3. The conductivity sensor according to claim 2, wherein the turn number ratio between transmitting coil (2) and receiving coil (5) is from about 1: 1 to not less than about 2: 1, preferably not less than about 3: 1, and more preferably switchable to not less than about 4: 1.
4. 4. Leitfähigkeitssensor, nach einem der vorhergehenden Ansprüche, wobei die Windungszahl der Sendespule (2) 20 bis 250 Windungen beträgt.4. 4. conductivity sensor, according to any one of the preceding claims, wherein the number of turns of the transmitting coil (2) is 20 to 250 turns.
5. 5. Leitfähigkeitssensor nach einem der vorhergehenden Ansprüche, weiterhin umfassend einen elektronischen Schalter (14) zum Umschalten zwischen den verschiedenen Spulenabgriffen (11 , 12), die jeweils den Windungszahlen zugeordnet sind.5. The conductivity sensor according to one of the preceding claims, further comprising an electronic switch (14) for switching between the different Spulenabgriffen (11, 12), which are respectively associated with the numbers of turns.
6. 6. Leitfähigkeitssensor nach Anspruch 5, wobei die Empfangseinrichtung (7) eine Steuerschaltung umfasst, welche den elektronischen Schalter (14) messbereichsabhängig steuert.6. 6. conductivity sensor according to claim 5, wherein the receiving device (7) comprises a control circuit which controls the electronic switch (14) depending on the measuring range.
7. 7. Leitfähigkeitssensor nach Anspruch 1 , wobei die Windungszahl der Empfangsspule zwischen mehr als zwei Werten für die Windungszahl umschaltbar ist.7. The conductivity sensor according to claim 1, wherein the number of turns of the receiving coil is switchable between more than two values for the number of turns.
8. 8. Leitfähigkeitssensor nach einem der vorhergehenden Ansprüche, wobei die Sendespule (2) und die Empfangsspule (5) ringförmig oder ringabschnittförmig aufgebaut sind, und die Windungen jeweils um einen ringförmigen magnetischen Kern (3, 6) verlaufen.8. 8. Conductivity sensor according to one of the preceding claims, wherein the Transmitting coil (2) and the receiving coil (5) are annular or ring-section-shaped, and the windings each extend around an annular magnetic core (3, 6).
9. 9. Leitfähigkeitssensor nach Anspruch 8, wobei die Windungen durch Verbinden einzelner Leiterabschnitte auf Leiterplatten mit Durchkontaktierungen erstellt sind. 9. 9. Conductivity sensor according to claim 8, wherein the windings are created by connecting individual conductor sections on printed circuit boards with plated-through holes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102006056174.0 | 2006-11-27 | ||
| DE200610056174 DE102006056174A1 (en) | 2006-11-27 | 2006-11-27 | Inductive conductivity sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008065112A1 true WO2008065112A1 (en) | 2008-06-05 |
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ID=39092928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2007/062887 WO2008065112A1 (en) | 2006-11-27 | 2007-11-27 | Inductive conductivity sensor |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE102006056174A1 (en) |
| WO (1) | WO2008065112A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114034929A (en) * | 2021-11-12 | 2022-02-11 | 国家海洋技术中心 | Non-external field inductive conductivity sensor |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008047960A1 (en) | 2008-09-18 | 2010-03-25 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Annular coil for use in inductive conductivity sensor utilized for measuring conductivity of liquid medium, has electrical conductor with two conductive strip sections, where current flow in one of sections is directed against component |
| DE102008048995A1 (en) | 2008-09-25 | 2010-04-01 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Inductive conductivity sensor |
| DE102008048996A1 (en) | 2008-09-25 | 2010-04-01 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Inductive conductivity sensor |
| DE102012112388A1 (en) | 2012-12-17 | 2014-07-03 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Inductive conductivity sensor and method for its production |
| DE102016119508A1 (en) | 2016-10-13 | 2018-04-19 | Krohne Messtechnik Gmbh | Conductivity sensor and method for determining the electrical conductivity of a liquid medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4000458A (en) * | 1975-08-21 | 1976-12-28 | Bell Telephone Laboratories, Incorporated | Method for the noncontacting measurement of the electrical conductivity of a lamella |
| EP0192915A1 (en) * | 1985-02-27 | 1986-09-03 | I.M.E.C. S.p.A. | Tansformer with a turn ratio variable while in operation |
| EP0999441A1 (en) * | 1998-11-06 | 2000-05-10 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. | Sensor for measuring electrical conductivity of a liquid |
| US6320764B1 (en) * | 2000-03-31 | 2001-11-20 | Yimin Jiang | Regulation circuit for a power converter and method of operation thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1598074A1 (en) * | 1965-09-25 | 1970-07-09 | Bissett Berman Corp | Measuring system |
| DE4116468A1 (en) * | 1991-05-21 | 1992-11-26 | Knick Elekt Messgeraete Gmbh | Inductive conductivity measurement cell, esp. for liquids - has conducting loop passed through transmission and reception coils for AC signals and resistances which can be switched into loop |
| US6414493B1 (en) * | 2001-03-26 | 2002-07-02 | Rosemount Analytical Inc. | Toroid conductivity sensor |
| DE10334830A1 (en) * | 2003-07-30 | 2005-05-19 | Siemens Ag | Coil for motor vehicle equipment has a magnetic core integrated in a printed circuit board and through-hole plated top and bottom strip conductor layers to form a continuous winding |
-
2006
- 2006-11-27 DE DE200610056174 patent/DE102006056174A1/en not_active Withdrawn
-
2007
- 2007-11-27 WO PCT/EP2007/062887 patent/WO2008065112A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4000458A (en) * | 1975-08-21 | 1976-12-28 | Bell Telephone Laboratories, Incorporated | Method for the noncontacting measurement of the electrical conductivity of a lamella |
| EP0192915A1 (en) * | 1985-02-27 | 1986-09-03 | I.M.E.C. S.p.A. | Tansformer with a turn ratio variable while in operation |
| EP0999441A1 (en) * | 1998-11-06 | 2000-05-10 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. | Sensor for measuring electrical conductivity of a liquid |
| US6320764B1 (en) * | 2000-03-31 | 2001-11-20 | Yimin Jiang | Regulation circuit for a power converter and method of operation thereof |
Non-Patent Citations (1)
| Title |
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| K. STRIGGOW AND R. DANKERT: "The Exact Theory of Inductive Conductivity Sensors for Oceanografic Application", IEEE JOURNAL OF OCEANIC ENGINEERING, vol. 10, no. 2, April 1985 (1985-04-01), pages 175 - 179, XP002470775 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114034929A (en) * | 2021-11-12 | 2022-02-11 | 国家海洋技术中心 | Non-external field inductive conductivity sensor |
| CN114034929B (en) * | 2021-11-12 | 2024-04-19 | 国家海洋技术中心 | Non-external field induction type conductivity sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102006056174A1 (en) | 2008-05-29 |
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