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DE1178616B - Electric state transmitter for the level of a liquid - Google Patents

Electric state transmitter for the level of a liquid

Info

Publication number
DE1178616B
DE1178616B DES79574A DES0079574A DE1178616B DE 1178616 B DE1178616 B DE 1178616B DE S79574 A DES79574 A DE S79574A DE S0079574 A DES0079574 A DE S0079574A DE 1178616 B DE1178616 B DE 1178616B
Authority
DE
Germany
Prior art keywords
liquid
resistance value
level
ptc thermistor
reached
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.)
Pending
Application number
DES79574A
Other languages
German (de)
Inventor
Dipl-Ing Rolf Bardenbacher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SEG Hausgeraete GmbH
Original Assignee
Siemens Elektrogaerate GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Elektrogaerate GmbH filed Critical Siemens Elektrogaerate GmbH
Priority to DES79574A priority Critical patent/DE1178616B/en
Priority to CH604763A priority patent/CH417138A/en
Priority to GB2015263A priority patent/GB1043254A/en
Publication of DE1178616B publication Critical patent/DE1178616B/en
Pending legal-status Critical Current

Links

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
    • G01F23/22—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G01F23/246—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices
    • G01F23/247—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices for discrete levels

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Thermally Actuated Switches (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Control Of Temperature (AREA)

Description

Elektrischer Zustandsgeber für das Niveau einer Flüssigkeit Die Erfindung stellt eine Anwendung von sogenannten Kaltleitern dar, deren Widerstandswert in einem bestimmten, von ihrer Zusammensetzung abhängigen Temperaturbereich nahezu sprungartig, z. B. um mehrere Zehnerpotenzen, ansteigt. Die Abhängigkeit des WiderstandswertesR- eines Kaltleiters von seiner Temperatur T hat bekanntlich einen Verlauf, wie er beispielsweise in F i g. 1 dargestellt ist.Electric state generator for the level of a liquid The invention represents an application of so-called PTC thermistors, whose resistance value is in a certain temperature range depending on their composition abruptly, e.g. B. increases by several powers of ten. The dependence of the resistance value R- of a PTC thermistor of its temperature T is known to have a course like it for example in FIG. 1 is shown.

Es ist bereits vorgeschlagen worden, bei der Steuerung eines Zeitprogramms für selbsttätig arbeitende Haushaltmaschinen als Niveausonde für Flüssigkeiten einen temperaturabhängigen Widerstand zu benutzen, der durch den Meßstrom beheizt und bei Erreichung des Niveausollwertes durch die Flüssigkeit abgekühlt wird. It has already been proposed in the control of a time program for self-working household machines as a level probe for liquids to use temperature-dependent resistance, which is heated by the measuring current and is cooled by the liquid when the level setpoint is reached.

Die Erfindung betrifft einen elektrischen Zustandsgeber für das Niveau einer Flüssigkeit, z. B. für die Steuerung des Zeitprogramms für selbsttätig arbeitende Maschinen, und besteht darin, daß als Sonde mindestens ein sogenannter Kaltleiter verwendet ist, dessen Widerstandswert mit steigender Temperatur in einem bestimmten, von seiner Zusammensetzung abhängigen Temperaturbereich nahezu sprungartig, z. B. um mehrere Zehnerpotenzen ansteigt, welcher vor Erreichen des Flüssigkeitsniveausollwertes durch den Meßstrom mindestens bis in den Bereich des sprungartigen Anstieges seines Widerstandswertes so aufgeheizt ist, daß bei Erreichung des Niveausollwertes durch die Flüssigkeit, beispielsweise bis unterhalb des sprungartigen Anstieges seines Widerstandswertes Abkühlung erfolgt. The invention relates to an electrical state transmitter for the level a liquid, e.g. B. for controlling the time program for automatically working Machines, and consists in that as a probe at least one so-called PTC thermistor is used, whose resistance value with increasing temperature in a certain, temperature range depending on its composition almost abruptly, z. B. rises by several powers of ten, whichever occurs before the liquid level setpoint is reached by the measuring current at least up to the area of the sudden increase in its Resistance value is so heated that when the level setpoint is reached by the liquid, for example to below the sudden rise of his Resistance value cooling takes place.

Die F i g. 2 der Zeichnung erläutert den Erfindungsgedanken an Hand eines Schaltungsbeispiels. In einem Gefäß mit der Wandung 1 und der Flüssigkeit 2 ist in einer Bohrung 3 der Wandung 1 eine wasserdichte Hülle 4 angebracht, die einen Kaltleiter 5 enthält, dessen Anschlüsse mit den beiden außerhalb des Bereiches der Flüssigkeit 2 angebrachten Anschlußfahnen 6 und 7 verbunden sind. Der Kaltleiter wird von einer Gleichspannung aufgeheizt, deren negativer Pol über den Widerstand 8 angeschlossen ist. The F i g. 2 of the drawing explains the idea of the invention by hand of a circuit example. In a vessel with the wall 1 and the liquid 2, a waterproof cover 4 is mounted in a bore 3 of the wall 1, the contains a PTC thermistor 5, the connections of which with the two outside the range the liquid 2 attached connecting lugs 6 and 7 are connected. The PTC thermistor is heated by a direct voltage, the negative pole of which is via the resistor 8 is connected.

Die mit dem Widerstand 8 verbundene Anschlußfahne 6 ist gleichzeitig mit der Basis des Transistors 9 verbunden, dessen Emitterelektrode an den positiven Punkt der Gleichspannungsquelle und dessen Kollektor über die Wicklung eines Relais 10 an den negativen Pol der Spannungsquelle angeschlossen ist. In dem in der Zeichnung dargestellten Fall umspült die Flüssigkeit 2 die Hülle 4 des Kaltleiters nicht, und der Widerstand 8 und die Größe der angeschlossenen Gleichspannung sei so gewählt, daß der Kaltleiter 5 durch den von der Gleichspannungsquelle verursachten Meßstrom mindestens bis in den Bereich oder gegebenenfalls auch über den Bereich des sprungartigen Anstieges seines Widerstandswertes aufgeheizt ist. Steigt der Wasserspiegel der Flüssigkeit 2 so weit, daß die Hülle 4 umspült wird, so wird der Kaltleiter 5 abgekühlt, wobei die sprungartige Widerstandsände rung eine sprungartige Anderung des Kollektorstromes des Transistors 9 verursacht. Das Ansprechen und Abfallen des Relais 10 kann beispielsweise in der Weise ausgenutzt werden, daß durch den Relaisanker 11 (in Verbindung mit den Relaiskontakten) ein entsprechendes Signal, z. B. zur Benutzung für die Steuerung von Maschinen, gegeben wird. The terminal lug 6 connected to the resistor 8 is simultaneous connected to the base of the transistor 9, the emitter electrode to the positive Point of the DC voltage source and its collector via the winding of a relay 10 is connected to the negative pole of the voltage source. In the one in the drawing the case shown, the liquid 2 does not wash the sheath 4 of the PTC thermistor, and the resistor 8 and the size of the connected DC voltage are chosen so that the PTC thermistor 5 is caused by the measuring current caused by the DC voltage source at least up to the range or possibly also over the range of the abrupt Rise in its resistance value is heated. The water level rises Liquid 2 so far that the envelope 4 is washed around, the PTC thermistor 5 is cooled, where the sudden change in resistance represents a sudden change in the collector current of the transistor 9 caused. The response and dropout of the relay 10 can, for example be used in such a way that the relay armature 11 (in conjunction with the relay contacts) a corresponding signal, e.g. B. for use for control of machines.

Die Erfindung läßt sich auch in der Weise durchbilden, daß an Stelle des einen Kaltleiters 5 eine Kombination von mehreren Kaltleiter benutzt wird. Diese Kaltleiter können beispielsweise unterschiedliche Ansprechtemperaturen für den sprungartigen Anstieg ihres Widerstandswertes haben und können auch durch einen Schalter von Hand oder selbsttätig umschaltbar sein. The invention can also be embodied in such a way that instead of of a PTC thermistor 5, a combination of several PTC thermistors is used. These PTC thermistors can, for example, have different response temperatures for the abrupt Increase in their resistance value and can also be done with a switch by hand or be switchable automatically.

Claims (3)

Patentansprüche: 1. Elektrischer Zustandsgeber für das Niveau einer Flüssigkeit, z. B. für die Steuerung des Zeitprogramms für selbsttätig arbeitende Maschinen, dadurch gekennzeichnet, daß als Sonde mindestens ein sogenannter Kaltleiter (5) verwendet ist, dessen Widerstandswert mit steigender Temperatur in einem bestimmten, von seiner Zusammensetzung abhängigen Temperaturbereich nahezu sprungartig, z. B. um mehrere Zehnerpotenzen ansteigt, welcher vor Erreichen des Flüssigkeitsniveausollwertes durch den Meßstrom mindestens bis in den Bereich des sprungartigen Anstieges seines Widerstandswertes so aufgeheizt ist daß bei Erreichung des Niveausollwertes durch die Flüssigkeit, beispielsweise bis unterhalb des sprungartigen Anstieges seines Widerstandswertes, Abkühlung erfolgt. Claims: 1. Electrical state generator for the level of a Liquid, e.g. B. for controlling the time program for automatically working Machines, characterized in that at least one so-called PTC thermistor is used as the probe (5) is used, its resistance value with increasing temperature in a certain, temperature range depending on its composition almost abruptly, z. B. rises by several powers of ten, whichever occurs before the liquid level setpoint is reached by the measuring current at least up to the range of the sudden Increase its resistance value is so heated that when the level setpoint is reached through the liquid, for example to below the sudden rise its resistance value, cooling takes place. 2. Elektrischer Zustandsgeber nach Anspruch 1, dadurch gekennzeichnet, daß der Kaltleiter (5) im Bereich des Niveausollwertes der Flüssigkeit in einer wasserdichten Hülle (4) angebracht ist, welche mit einer z. B. abschraubbaren und mit Anschlußfahnen (6, 7) versehenen Halterung versehen ist. 2. Electrical status transmitter according to claim 1, characterized in that that the PTC thermistor (5) in the range of the level setpoint of the liquid in a waterproof cover (4) is attached, which with a z. B. unscrewable and with connection lugs (6, 7) provided bracket is provided. 3. Elektrischer Zustandsgeber nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß mehrere Kaltleiter (5) mit unterschiedlicher Ansprechtemperatur für den sprungartigen Anstieg ihres Widerstandswertes benutzt sind und von Hand oder selbsttätig umschaltbar sind. 3. Electrical status transmitter according to claim 1 or 2, characterized in that that several PTC thermistors (5) with different response temperatures for the jump-like Increase in their resistance value are used and can be switched manually or automatically are.
DES79574A 1962-05-23 1962-05-23 Electric state transmitter for the level of a liquid Pending DE1178616B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DES79574A DE1178616B (en) 1962-05-23 1962-05-23 Electric state transmitter for the level of a liquid
CH604763A CH417138A (en) 1962-05-23 1963-05-14 Device for recording liquid levels
GB2015263A GB1043254A (en) 1962-05-23 1963-05-21 Apparatus for determining a liquid level

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES79574A DE1178616B (en) 1962-05-23 1962-05-23 Electric state transmitter for the level of a liquid

Publications (1)

Publication Number Publication Date
DE1178616B true DE1178616B (en) 1964-09-24

Family

ID=7508290

Family Applications (1)

Application Number Title Priority Date Filing Date
DES79574A Pending DE1178616B (en) 1962-05-23 1962-05-23 Electric state transmitter for the level of a liquid

Country Status (3)

Country Link
CH (1) CH417138A (en)
DE (1) DE1178616B (en)
GB (1) GB1043254A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3363466A (en) * 1965-08-24 1968-01-16 Aladdin Ind Inc Fluid detection device
DE1275781B (en) * 1964-12-28 1968-08-22 Crosweller & Co Ltd W Device for the electrical display of the liquid level in a container
DE1460963B1 (en) * 1964-10-05 1972-08-03 Walter Holzer Device with a temperature sensor arranged in a wall opening
US3781839A (en) * 1972-01-07 1973-12-25 Texas Instruments Inc Fluid flow sensing device
DE3115776A1 (en) * 1981-04-18 1983-01-05 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt THERMOELECTRIC LEVEL MEASURING DEVICE
DE3125633A1 (en) * 1981-06-30 1983-01-13 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Level measuring device
DE3148383A1 (en) * 1981-12-07 1983-06-16 Siemens AG, 1000 Berlin und 8000 München Device for measuring the filling level
DE3327047A1 (en) * 1982-08-23 1984-02-23 General Electric Co., Schenectady, N.Y. LIQUID LEVEL SENSOR
DE3232333A1 (en) * 1982-08-31 1984-03-01 Siemens AG, 1000 Berlin und 8000 München Level sensor for fluids, in particular for determining the level of the brake fluid or of the contents of the fuel tank in motor vehicles
DE3305315C1 (en) * 1983-02-16 1984-05-30 Siemens AG, 1000 Berlin und 8000 München Device for measuring the fill level in a vessel containing a liquid, in particular in a fuel tank of motor vehicles
DE3445882A1 (en) * 1984-12-15 1986-06-19 Franz 7500 Karlsruhe Ritschel Aquarium monitoring device
DE3153284C2 (en) * 1981-04-18 1987-01-02 Telefunken electronic GmbH, 7100 Heilbronn Thermoresistive filling level measurement device
EP0220618A3 (en) * 1985-10-26 1989-02-08 Messer Griesheim Gmbh Device for automatically limiting a cryogenic fluid filling level
DE3804474A1 (en) * 1988-02-11 1989-09-14 Fafnir Gmbh Probe entry lock

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR8109034A (en) * 1981-08-27 1983-06-21 Caterpillar Tractor Co FLUID LEVEL AND TEMPERATURE SENSOR
GB9201466D0 (en) * 1992-01-23 1992-03-11 Imi Air Conditioning Ltd Improvements relating to air conditioners

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1460963B1 (en) * 1964-10-05 1972-08-03 Walter Holzer Device with a temperature sensor arranged in a wall opening
DE1275781B (en) * 1964-12-28 1968-08-22 Crosweller & Co Ltd W Device for the electrical display of the liquid level in a container
US3363466A (en) * 1965-08-24 1968-01-16 Aladdin Ind Inc Fluid detection device
US3781839A (en) * 1972-01-07 1973-12-25 Texas Instruments Inc Fluid flow sensing device
DE3153284C2 (en) * 1981-04-18 1987-01-02 Telefunken electronic GmbH, 7100 Heilbronn Thermoresistive filling level measurement device
DE3115776A1 (en) * 1981-04-18 1983-01-05 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt THERMOELECTRIC LEVEL MEASURING DEVICE
DE3125633A1 (en) * 1981-06-30 1983-01-13 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Level measuring device
DE3148383A1 (en) * 1981-12-07 1983-06-16 Siemens AG, 1000 Berlin und 8000 München Device for measuring the filling level
DE3327047A1 (en) * 1982-08-23 1984-02-23 General Electric Co., Schenectady, N.Y. LIQUID LEVEL SENSOR
DE3232333A1 (en) * 1982-08-31 1984-03-01 Siemens AG, 1000 Berlin und 8000 München Level sensor for fluids, in particular for determining the level of the brake fluid or of the contents of the fuel tank in motor vehicles
DE3305315C1 (en) * 1983-02-16 1984-05-30 Siemens AG, 1000 Berlin und 8000 München Device for measuring the fill level in a vessel containing a liquid, in particular in a fuel tank of motor vehicles
DE3445882A1 (en) * 1984-12-15 1986-06-19 Franz 7500 Karlsruhe Ritschel Aquarium monitoring device
EP0220618A3 (en) * 1985-10-26 1989-02-08 Messer Griesheim Gmbh Device for automatically limiting a cryogenic fluid filling level
DE3804474A1 (en) * 1988-02-11 1989-09-14 Fafnir Gmbh Probe entry lock

Also Published As

Publication number Publication date
CH417138A (en) 1966-07-15
GB1043254A (en) 1966-09-21

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