EP1666809B1 - Protection device for a hot water storage tank - Google Patents

Protection device for a hot water storage tank Download PDF

Info

Publication number
EP1666809B1
EP1666809B1 EP05110337A EP05110337A EP1666809B1 EP 1666809 B1 EP1666809 B1 EP 1666809B1 EP 05110337 A EP05110337 A EP 05110337A EP 05110337 A EP05110337 A EP 05110337A EP 1666809 B1 EP1666809 B1 EP 1666809B1
Authority
EP
European Patent Office
Prior art keywords
temperature sensor
signal
heater
current anode
anode
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.)
Not-in-force
Application number
EP05110337A
Other languages
German (de)
French (fr)
Other versions
EP1666809A1 (en
Inventor
Ulrich Kroell
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1666809A1 publication Critical patent/EP1666809A1/en
Application granted granted Critical
Publication of EP1666809B1 publication Critical patent/EP1666809B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/40—Arrangements for preventing corrosion
    • F24H9/45—Arrangements for preventing corrosion for preventing galvanic corrosion, e.g. cathodic or electrolytic means
    • F24H9/455—Arrangements for preventing corrosion for preventing galvanic corrosion, e.g. cathodic or electrolytic means for water heaters
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/04—Controlling or regulating desired parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/40—Arrangements for preventing corrosion
    • F24H9/45—Arrangements for preventing corrosion for preventing galvanic corrosion, e.g. cathodic or electrolytic means

Definitions

  • the invention relates to a hot water storage unit according to the preamble of claim 1.
  • a hot water storage unit is from the EP 1077352 A2 already known.
  • the anode current prevents the corrosion of the metallic bright wall areas of the storage tank without the foreign current anode in the storage water having to be used up and replaced.
  • the external current anode is connected to a power supply and has an independent evaluation, which provides information about the operating or maintenance state of the storage container to display elements, however, has no influence on the control of the storage heater.
  • a protective device for hot water storage in which an evaluation is provided for detecting the anode current, which is connected to a control device of the storage heater and transmitted in the absence of anode current to prevent the start of the storage heater blocking signal to the control device of the storage heater.
  • the evaluation electronics can be accommodated both in a central electronics of the heater and in an independent evaluation of the foreign current anode.
  • the hot water tank also has at least one temperature sensor whose signal is also supplied to the central electronics of the control unit and via which the heat demand for the storage tank is determined. The signal transmission for the temperature sensor and for the external current anode is carried out in each case via separate signal lines which are guided from the storage container to the central electronics of the control unit arranged in the heater.
  • the object of the invention is to simplify the signal transmission between the storage unit and the heater, thereby reducing the system cost.
  • the object of the invention is achieved with the characterizing measures of claim 1. Due to the signal transmission of the signal of the external current anode via the signal line of the temperature sensor, only one signal line is necessary for the two signals from temperature sensor and external current probe.
  • FIG. 1 shows a schematic circuit arrangement of the protective device according to the invention.
  • a designated 10 heater has a controller 11 for controlling and / or regulating the heater 10 and a hot water storage unit 12.
  • the storage unit 12 has a storage tank 13, is stored in the hot process water, which is heated by a not shown charging circuit from the heater 10.
  • the known hydraulic connections of the heater 10 and the storage container 13 are not shown.
  • the memory unit 12 has a protective device with evaluation electronics 15, to which a third plug connection 16, an external current anode 17 and a second plug connection 18, an NTC temperature sensor 19 is connected.
  • evaluation electronics 15 also carries a signal transmission line 20 to the control unit 11 of the heater 10, wherein expediently on the control unit 11, a further connector 21 is provided for the signal transmission line 20.
  • the transmitter 15 is connected via a power supply line 22 to a power grid 23.
  • the evaluation electronics 15 furthermore have a circuit arrangement 25 with a resistor 26 and a switching part 27.
  • the circuit arrangement 25 is supplied with a signal line 28 of the temperature sensor 19, wherein the signal line 28 is led via the resistor 26 to the signal transmission line 20.
  • An anode current detecting means 30 is connected to the power supply line 22 and the foreign current anode 17 and to the switching part 27.
  • the switching part 27 is designed so that it short-circuits the signal line 28 to the signal transmission line 20 parallel to the resistor 26. If a failure or a faulty protective anode current is detected by the anode current detection device 30, the switching part 27 is actuated by means of suitable measures by the anode current detection device 30 and the short-circuited bridging of the signal line 28 to the signal transmission line 20 is opened so that the signal voltage of the temperature sensor 19 is influenced by the resistor 26. As a result, the signal voltage is changed in such a way that the control unit 11 detects a change in the signal voltage transmitted via the signal transmission line 20 as an interference function of the external current anode 17.
  • the function of the foreign current anode 17 is disturbed when there is no power supply or the protective effect of the external current anode is missing.
  • the circuit arrangement 25 drastically changes the signal of the temperature sensor 19, so that the central electronics of the control unit 11 detects the changed signal of the temperature sensor 19 as a noise signal of the foreign current anode 17.
  • the operator of the heater, a disturbed operation is signaled or by appropriate measures of the hot water charging operation, the memory unit 12 is turned off.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Details Of Fluid Heaters (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Farming Of Fish And Shellfish (AREA)

Abstract

The Projection device has a circuit arrangement (25), which covers the device to transfer the signal of impressed-current anode (17) to signal transmission line of temperature sensor. A heater, for storage tank (13), with impressed-current anode protrudes in storage tank whereby a temperature sensor (19) for detection of temperature of water in storage tank is also provided.

Description

Die Erfindung betrifft eine Warmwasser-Speichereinheit nach dem Oberbegriff des Anspruchs 1. Eine solche Warmwasser-Speichereinheit ist aus der EP 1077352 A2 bereits bekannt.The invention relates to a hot water storage unit according to the preamble of claim 1. Such a hot water storage unit is from the EP 1077352 A2 already known.

Stand der TechnikState of the art

Bei Schutzeinrichtungen für Warmwasserspeicher mit einer sogenannten Fremdstromanode verhindert der Anodenstrom die Korrosion der metallisch blanken Wandstellen des Speicherbehälters, ohne dass sich die im Speicherwasser befindliche Fremdstromanode verbraucht und ausgewechselt werden muss. Bei den bekannten Schutzeinrichtungen ist die Fremdstromanode mit einem Netzteil verbunden und weist eine eigenständige Auswerteelektronik auf, die Informationen über den Betriebs- bzw. Erhaltungszustand des Speicherbehälters an Anzeigeelemente liefert, die jedoch auf die Steuerung der Speicherheizung keinen Einfluss hat.In the case of protective devices for hot water storage tanks with a so-called external current anode, the anode current prevents the corrosion of the metallic bright wall areas of the storage tank without the foreign current anode in the storage water having to be used up and replaced. In the known protective devices, the external current anode is connected to a power supply and has an independent evaluation, which provides information about the operating or maintenance state of the storage container to display elements, however, has no influence on the control of the storage heater.

Aus EP 10 77 352 A2 ist eine Schutzeinrichtung für Warmwasserspeicher bekannt, bei der eine Auswerteelektronik zur Erfassung des Anodenstroms vorgesehen ist, die mit einer Steuereinrichtung der Speicherheizung verbunden ist und bei Fehlen des Anodenstroms ein die Inbetriebnahme der Speicherheizung verhinderndes Sperrsignal an die Steuereinrichtung der Speicherheizung übermittelt. Dabei kann die Auswertelektronik sowohl in einer Zentralelektronik des Heizgerätes als auch in einer eigenständigen Auswerteelektronik der Fremdstromanode untergebracht sein. Der Warmwasserspeicher verfügt ferner über mindestens einen Temperaturfühler, dessen Signal ebenfalls der Zentralelektronik des Steuergerätes zugeführt wird und über den der Wärmebedarf für den Speicherbehälter ermittelt wird. Die Signalübertragung für den Temperaturfühler und für die Fremdstromanode erfolgt dabei über jeweils separate Signalleitungen, die vom Speicherbehälter zu der im Heizgerät angeordneten Zentralelektronik des Steuergerätes geführt sind.Out EP 10 77 352 A2 a protective device for hot water storage is known, in which an evaluation is provided for detecting the anode current, which is connected to a control device of the storage heater and transmitted in the absence of anode current to prevent the start of the storage heater blocking signal to the control device of the storage heater. In this case, the evaluation electronics can be accommodated both in a central electronics of the heater and in an independent evaluation of the foreign current anode. The hot water tank also has at least one temperature sensor whose signal is also supplied to the central electronics of the control unit and via which the heat demand for the storage tank is determined. The signal transmission for the temperature sensor and for the external current anode is carried out in each case via separate signal lines which are guided from the storage container to the central electronics of the control unit arranged in the heater.

Aufgabe der Erfindung ist es, die Signalübertragung zwischen Speichereinheit und Heizgerät zu vereinfachen, um dadurch die Systemkosten zu reduzieren.The object of the invention is to simplify the signal transmission between the storage unit and the heater, thereby reducing the system cost.

Vorteile der ErfindungAdvantages of the invention

Die Aufgabe der Erfindung wird mit den kennzeichnenden Maßnahmen des Anspruchs 1 gelöst. Durch die Signalübertragung des Signals der Fremdstromanode über die Signalleitung des Temperaturfühlers ist für die beiden Signale von Temperaturfühler und Fremdstromsonde nur noch eine Signalleitung notwendig.The object of the invention is achieved with the characterizing measures of claim 1. Due to the signal transmission of the signal of the external current anode via the signal line of the temperature sensor, only one signal line is necessary for the two signals from temperature sensor and external current probe.

Vorteilhafte Weiterbildungen der Erfmdung sind durch die Maßnahmen der Unteransprüche möglich. Besonders zweckmäßig ist es, eine Auswertelektronik für den Speicherbehälter vorzusehen, der mit Steckanschlüssen für die Fremdstromanode und für den Temperaturfühler ausgerüstet ist. Damit ist die technische Lösung rückwärtskompatibel, d.h., dass die Auswerteelektronik für bereits existierende Heizgeräte-Speicher-Systeme nachrüstbar ist. Eine einfache Signalübertragung wird mittels eines Schaltteils realisiert, das bei Ausfall des Anodenstroms einen in die Signalleitung des Temperaturfühlers geschalteten Widerstand überbrückt, sodass von der Zentralelektronik des Steuergerätes des Heizgerätes ein entsprechender Signalwert über die Signalleitung des Temperaturfühlers detektiert wird, der auf einen Ausfall der Fremdstromanode schließt.Advantageous developments of the invention are possible by the measures of the subclaims. It is particularly expedient to provide an evaluation electronics for the storage container, which is equipped with plug-in connections for the external current anode and for the temperature sensor. Thus, the technical solution is backwards compatible, that is, that the evaluation for retrofittable heater storage systems can be retrofitted. A simple signal transmission is realized by means of a switching part, which bridges a switched in the signal line of the temperature sensor resistor in case of failure of the anode current, so that a corresponding signal value via the signal line of the temperature sensor is detected by the central electronics of the control unit of the heater, which includes a failure of the foreign current anode ,

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die Figur zeigt eine schematische Schaltungsanordnung der erfindungsgemäßen Schutzvorrichtung.An embodiment of the invention is illustrated in the drawing and explained in more detail in the following description. The figure shows a schematic circuit arrangement of the protective device according to the invention.

Ausführungsbeispielembodiment

Ein mit 10 bezeichnetes Heizgerät weist ein Steuergerät 11 zum Steuern und/oder Regeln des Heizgerätes 10 und eines Warmwasser-Speichereinheit 12 auf. Die Speichereinheit 12 besitzt einen Speicherbehälter 13, in dem warmes Brauchwasser gespeichert wird, das über einen nicht dargestellten Ladekreis vom Heizgerät 10 erwärmt wird. Die an sich bekannten hydraulischen Anschlüsse des Heizgerätes 10 und des Speicherbehälters 13 sind nicht dargestellt.A designated 10 heater has a controller 11 for controlling and / or regulating the heater 10 and a hot water storage unit 12. The storage unit 12 has a storage tank 13, is stored in the hot process water, which is heated by a not shown charging circuit from the heater 10. The known hydraulic connections of the heater 10 and the storage container 13 are not shown.

Die Speichereinheit 12 verfügt über eine Schutzvorrichtung mit einer Auswerteelektronik 15, an die über eine erste Steckverbindung 16 eine Fremdstromanode 17 und über eine zweite Steckverbindung 18 ein NTC-Temperaturfühler 19 angeschlossen ist. Von der Auswertelektronik 15 führt ferner eine Signalübertragungsleitung 20 zum Steuergerät 11 des Heizgerätes 10, wobei zweckmäßigerweise am Steuergerät 11 eine weitere Steckverbindung 21 für die Signalübertragungsleitung 20 vorgesehen ist. Die Auswerteelektronik 15 ist über eine Stromversorgungsleitung 22 an ein Stromnetz 23 angeschlossen.The memory unit 12 has a protective device with evaluation electronics 15, to which a third plug connection 16, an external current anode 17 and a second plug connection 18, an NTC temperature sensor 19 is connected. Of the Evaluation electronics 15 also carries a signal transmission line 20 to the control unit 11 of the heater 10, wherein expediently on the control unit 11, a further connector 21 is provided for the signal transmission line 20. The transmitter 15 is connected via a power supply line 22 to a power grid 23.

Die Auswerteelektronik 15 verfügt ferner über eine Schaltungsanordnung 25 mit einem Widerstand 26 und einem Schaltteil 27. Der Schaltungsanordnung 25 wird eine Signalleitung 28 des Temperaturfühlers 19 zugefiihrt, wobei die Signalleitung 28 über den Widerstand 26 an die Signalübertragungsleitung 20 geführt wird. Eine Anodenstromerfassungseinrichtung 30 ist mit der Stromversorgungsleitung 22 und der Fremdstromanode 17 sowie mit dem Schaltteil 27 verbunden.The evaluation electronics 15 furthermore have a circuit arrangement 25 with a resistor 26 and a switching part 27. The circuit arrangement 25 is supplied with a signal line 28 of the temperature sensor 19, wherein the signal line 28 is led via the resistor 26 to the signal transmission line 20. An anode current detecting means 30 is connected to the power supply line 22 and the foreign current anode 17 and to the switching part 27.

Das Schaltteil 27 ist so ausgeführt, dass es parallel zum Widerstand 26 die Signalleitung 28 mit der Signalübertragungsleitung 20 kurzschließt. Wird von der Anodenstromerfassungseinrichtung 30 ein Ausfall oder ein fehlerhafter Schutzanodenstrom erfasst, wird mittels geeigneter Maßnahmen von der Anodenstromerfassungseinrichtung 30 das Schaltteil 27 betätigt und dabei die kurzgeschlossene Überbrückung der Signalleitung 28 zur Signalübertragungsleitung 20 geöffnet, sodass die Signalspannung des Temperaturfiihlers 19 vom Widerstand 26 beeinflusst ist. Dadurch wird die Signalspannung derart verändert, dass das Steuergerät 11 eine Veränderung der über die Signalübertragungsleitung 20 übertragenen Signalspannung als Störfunktion der Fremdstromanode 17 detektiert.The switching part 27 is designed so that it short-circuits the signal line 28 to the signal transmission line 20 parallel to the resistor 26. If a failure or a faulty protective anode current is detected by the anode current detection device 30, the switching part 27 is actuated by means of suitable measures by the anode current detection device 30 and the short-circuited bridging of the signal line 28 to the signal transmission line 20 is opened so that the signal voltage of the temperature sensor 19 is influenced by the resistor 26. As a result, the signal voltage is changed in such a way that the control unit 11 detects a change in the signal voltage transmitted via the signal transmission line 20 as an interference function of the external current anode 17.

Die Funktion der Fremdstromanode 17 ist dann gestört, wenn keine Spannungsversorgung vorliegt oder die Schutzwirkung der Fremdstromanode fehlt. In diesen Fällen verändert die Schaltungsanordnung 25 drastisch das Signal des Temperaturfühlers 19, so dass die Zentralelektronik des Steuergerätes 11 das veränderte Signal des Temperaturfühlers 19 als Störsignal der Fremdstromanode 17 erkennt. Dem Betreiber des Heizgerätes wird ein gestörten Betrieb signalisiert bzw. durch geeignete Maßnahmen des Warmwasser-Ladebetriebes wird die Speichereinheit 12 abgeschaltet.The function of the foreign current anode 17 is disturbed when there is no power supply or the protective effect of the external current anode is missing. In these cases, the circuit arrangement 25 drastically changes the signal of the temperature sensor 19, so that the central electronics of the control unit 11 detects the changed signal of the temperature sensor 19 as a noise signal of the foreign current anode 17. The operator of the heater, a disturbed operation is signaled or by appropriate measures of the hot water charging operation, the memory unit 12 is turned off.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Heizgerätheater
1111
Steuergerätcontrol unit
1212
Warmwasser-SpeichereinheitHot water storage unit
1313
Speicherbehälterstorage container
1515
Auswerteelektronikevaluation
1616
erste Steckverbindungfirst plug connection
1717
FremdstromanodeImpressed current anode
1818
zweite Steckverbindungsecond plug connection
1919
Temperaturfühlertemperature sensor
2020
SignalübertragungsleitungSignal transmission line
2121
weitere Steckverbindungfurther plug connection
2222
Stromversorgungpower supply
2323
Stromnetzpower grid
2525
Schaltungsanordnungcircuitry
2626
Widerstandresistance
2727
Schaltteilswitching part
2828
Signalleitungsignal line
3030
AnodenstromerfassungseinrichtungAnode current detector

Claims (4)

  1. A hot water storage unit comprising a storage container (13) with a protective device for said hot water storage unit (12), comprising a storage heater which is controlled depending on the heat requirement for the storage container (13) which is supplied by a heater (10), comprising an impressed current anode (17) which projects into the storage container (13) and comprising a temperature sensor (19) to detect the temperature of the water in the storage container (13), wherein the impressed current anode (17) is connected to an evaluation electronics (15), said heater (10) has a controller (11) to which a signal transmission line (20) of the temperature sensor (19) is connected and wherein the evaluation electronics (15) comprise a circuit arrangement (25) via which the signal transmission line (20) of the temperature sensor (19) is guided, characterised in that the circuit arrangement (25) comprises a device for transmitting the signal of the impressed current anode (17) to the signal transmission line (20) of the temperature sensor.
  2. The protective device according to claim 1, characterised in that the device for transmitting the signal of the impressed current anode (17) to the signal transmission line (20) of the temperature sensor (19) comprises a resistor (26) and a switching unit (27) arranged in parallel and that an anode current detection device (30) is provided, said device acting on the switching unit (27) when a signal of the impressed current anode (17) is perturbed.
  3. The protective device according to claim 1, characterised in that the evaluation electronics (15) has plug connections (16, 18) to which the signal lines of the impressed current anode (17) and/or the temperature sensor (19) can be connected.
  4. The protective device according to claim 1, 2 or 3, characterised in that the circuit arrangement (25) comprising a single signal transmission line transmits the signals of the impressed current anode (17) and the temperature sensor (19) to the controller (11) of the heater (10).
EP05110337A 2004-11-17 2005-11-04 Protection device for a hot water storage tank Not-in-force EP1666809B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004055261A DE102004055261B3 (en) 2004-11-17 2004-11-17 Protective device for a hot water tank

Publications (2)

Publication Number Publication Date
EP1666809A1 EP1666809A1 (en) 2006-06-07
EP1666809B1 true EP1666809B1 (en) 2007-10-10

Family

ID=35447958

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05110337A Not-in-force EP1666809B1 (en) 2004-11-17 2005-11-04 Protection device for a hot water storage tank

Country Status (3)

Country Link
EP (1) EP1666809B1 (en)
AT (1) ATE375485T1 (en)
DE (2) DE102004055261B3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3679172A1 (en) * 2017-09-07 2020-07-15 Carrier Corporation Corrosion protection system for heating ventalation air conditioning refrigeration
CN109869910B (en) * 2017-12-05 2022-03-22 青岛经济技术开发区海尔热水器有限公司 Corrosion prevention device and water heater
WO2021007611A1 (en) * 2019-07-12 2021-01-21 Rheem Australia Pty Limited Monitoring system for heated fluids

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3916847A1 (en) * 1989-05-24 1990-11-29 Norsk Hydro Magnesium Electrical corrosion protection for water container - has e.g. water heater element as anode and container wall as cathode with pole-reversal protection diode between their connectors
DE9002952U1 (en) * 1990-01-30 1990-08-02 Norsk Hydro Magnesiumgesellschaft mbH, 4250 Bottrop Water heater or similar
FR2776370B1 (en) * 1998-03-20 2000-05-26 Pierre Lacaze HOT WATER PRODUCTION DEVICE COMPRISING A TANK EQUIPPED WITH IMPOSED CURRENT CATHODE PROTECTION MEANS
DE19939134C1 (en) * 1999-08-18 2001-03-15 Bosch Gmbh Robert Protection device for hot water storage

Also Published As

Publication number Publication date
EP1666809A1 (en) 2006-06-07
DE502005001665D1 (en) 2007-11-22
DE102004055261B3 (en) 2006-08-03
ATE375485T1 (en) 2007-10-15

Similar Documents

Publication Publication Date Title
DE69630053T2 (en) Method and device for controlling liquid transfer
EP2024712B1 (en) Device for transmitting measured values
DE69924585T2 (en) Detection of Fluid Leakage and Fluid Flow to Prevent and Limit Damage
DE60022276T2 (en) Control circuit for gas burners
EP1666809B1 (en) Protection device for a hot water storage tank
DE4344866A1 (en) Control device and device for programming it
EP2240677A1 (en) Method for monitoring at least one glow plug of an internal combustion engine and corresponding device
DE2800704C2 (en) Arrangement for controlling a valve to influence the room temperature
EP2035802B1 (en) Sensor unit for a wheelset bearing
DE102005051795A1 (en) Display device for process automation engineering, has microcontroller for evaluating digital current signal and for controlling display unit, which represents actual measuring value and corresponding status information of transducer
WO2005093240A1 (en) Device and method for reducing a sensor contamination
DE102011011202A1 (en) Protection device for protecting pump from overheating or before dry running, particularly for protecting procedural process units, has fluid lines, housing and mounting plate
DE3838715C2 (en)
DE102007012992B3 (en) Measured variable sensor for use in measured variable detection system, has capacitor storage unit laid in connection between connecting cable and sensor line, where connection of inductive component is attached over diode to storage unit
EP1462724B1 (en) Apparatus for temperature control or limitation of a heat generator
EP3426987B1 (en) Apparatus for checking the operability of a heating system
DE102009021918A1 (en) positioner
DE202011001009U1 (en) Sensor system with inductive proximity switch
WO2021044047A1 (en) Water heater and method for controlling a water heater
DE10249846B4 (en) Redundant arrangement of field devices with current output and field device for such an arrangement
WO2016107931A1 (en) Thermostat device and method for detecting mis-wiring in a thermostat device
DE102015015941B4 (en) Switchable analog interface for field devices
DE102006049651A1 (en) Position sensor for use in process plant, has two energy sources attached at sensor, where energy sources supply electric energy to both electronic component i.e. microcomputer, and sensor independent of each other
EP0530727B2 (en) Storage heater
EP0315042B1 (en) Control of a fuel-heated heat source

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

17P Request for examination filed

Effective date: 20061207

AKX Designation fees paid

Designated state(s): AT CH DE FR GB LI

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT CH DE FR GB LI

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 502005001665

Country of ref document: DE

Date of ref document: 20071122

Kind code of ref document: P

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: SCINTILLA AG, DIREKTION

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20071227

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20080711

REG Reference to a national code

Ref country code: DE

Ref legal event code: R084

Ref document number: 502005001665

Country of ref document: DE

Effective date: 20120919

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20131122

Year of fee payment: 9

Ref country code: AT

Payment date: 20131121

Year of fee payment: 9

Ref country code: GB

Payment date: 20131122

Year of fee payment: 9

Ref country code: FR

Payment date: 20131119

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20140124

Year of fee payment: 9

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502005001665

Country of ref document: DE

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 375485

Country of ref document: AT

Kind code of ref document: T

Effective date: 20141104

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20141104

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20141130

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20141130

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20150731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20141104

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150602

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20141104

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20141201