EP1251718B1 - Electrical, explosion protected heater, particularly for the heating of the inner space of a protected cupboard containing instruments - Google Patents
Electrical, explosion protected heater, particularly for the heating of the inner space of a protected cupboard containing instruments Download PDFInfo
- Publication number
- EP1251718B1 EP1251718B1 EP02003944A EP02003944A EP1251718B1 EP 1251718 B1 EP1251718 B1 EP 1251718B1 EP 02003944 A EP02003944 A EP 02003944A EP 02003944 A EP02003944 A EP 02003944A EP 1251718 B1 EP1251718 B1 EP 1251718B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- fuse
- heating
- explosion
- changeover
- 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.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0202—Switches
- H05B1/0205—Switches using a fusible material
Definitions
- the invention relates to an electric, explosion-proof heating, in particular for heating the interior of an instrument protective cabinet according to the preamble of claim 1.
- such an explosion-proof heater requires that it requires little space with good effectiveness, that it can be adapted to different conditions, that a set temperature be controlled as precisely as possible, and that protection regulations with regard to contact protection and explosion protection be maintained.
- a known, generic heating ( DE 38 14 145 C2 ) comprises a radiator having a receiving opening, a heating element and an over-temperature fuse connected thereto in series with a specific response temperature, wherein the heating element is inserted into the receiving opening and encapsulated.
- the heating element and the series-connected overtemperature protection are connected via electrical connection cables to a temperature controller to which an ambient temperature sensor is also connected as an actual value transmitter.
- Such heaters are the specific conditions of use to be adapted and dimensioned so that in a temperature-controlled operation by the explosion protection specified limit temperatures are not exceeded.
- unfavorable conditions and a combination of unfavorable boundary conditions In unfavorable conditions and a combination of unfavorable boundary conditions, however, excessive overheating of the heater can not be ruled out, especially in the event of overshoot of the temperature control without additional measures.
- the above-mentioned overtemperature safeguards interrupt the electrical heating circuit in such a case. So far, reversible switching elements are used as overtemperature fuses, which are resettable after a response in their backup function. There are also known by hand exchangeable fuses.
- the object of the invention is to propose measures with which such a complete replacement for the heating is usually avoidable.
- a fuse temperature sensor is arranged in the region of the fuse and cast with in the receiving opening.
- the fuse temperature sensor is connected with connecting cables to the temperature controller.
- This fuse temperature sensor can be used to determine the current temperature of the fuse for comparison with a changeover temperature set in the temperature controller. This switching temperature is selected so that it lies within a sufficient safety temperature distance below the response temperature of the fuse.
- the temperature controller is designed so that it works in a temperature range below the predetermined and can be determined with the fuse temperature sensor switching temperature in a conventional manner in a first control algorithm, including the ambient temperature sensor as an actual value. A reaching and / or exceeding this predetermined switching temperature is detected by the temperature controller by evaluating the sensor values of the fuse temperature sensor, whereupon the temperature controller switches to another second control algorithm and de-regulates the heating power of the heating element to protect the fuse. After a subsequent undershooting of the switching temperature, optionally with a predeterminable in the control algorithm underflow distance, then the temperature controller switches back to the first control algorithm.
- the switching temperature is to be chosen so that even with unfavorable conditions, for example in a possible overshoot of the temperature control according to the first control algorithm at an initial heating phase with not yet steady temperature, the response temperature of the fuse due to the reduction of the heating power of the heating element is certainly not reached ,
- the arrangement according to the invention can preferably be installed in a radiator known per se, which is designed as an elongate body with an axial receiving space and radially projecting heating fins.
- such a radiator according to claim 3 is preferably made of metal.
- the radiator is preferably made of metal.
- the radiator is known to produce the radiator as a whole casting or as in the DE 38 14 145 C2 described to manufacture the lamellae separately and to attach to a base body.
- According to claim 4 can be used as a fuse temperature sensor, a cost NTC resistor.
- the switching temperature in the control circuit.
- a better adaptation to different conditions is possible according to claim 5, when the switching temperature is adjustable on the temperature controller. Even with such an adjustable switching temperature, the overall safety function of the cast fuse is not affected.
- control algorithms can be fixed. According to claim 6, it may be appropriate for further adjustments to make the control algorithm for the temperature range below the switching temperature and / or the control algorithm for the range above the switching temperature adjustable.
- the single figure shows schematically an electric, explosion-proof heating, z.
- This heater comprises a radiator 2 with a receiving opening 3, wherein the radiator 2 is formed as an elongated body with an axial receiving space as a receiving space opening and with radially projecting heating fins 4.
- the radiator 2 may be cast, for example, of metal.
- the electrical, explosion-proof heater 1 further comprises a heating element 5 and a series-connected fuse as overtemperature fuse 6 with a specific response temperature.
- the heating element 5 and the excess temperature fuse 6 are inserted into the receiving opening 3 and potted there by means of a potting compound 7.
- the single figure can also be further seen that the heating element 5 is connected to the serially connected over-temperature fuse 6 via electrical connection lines 8, 14 with a temperature controller 9, to which an ambient temperature sensor 10 is connected as an actual value.
- a fuse temperature sensor 11 formed by an NTC resistor is furthermore arranged and molded into the receiving opening 3, which is likewise connected to the temperature regulator 9 with connection lines 12, 13.
- the current temperature of the excess temperature fuse 6 can be determined for a comparison with a predetermined switching temperature, the switching temperature is set with a safety temperature interval below the response temperature of the excess temperature fuse 6.
- the temperature controller 9 operates in a temperature range below the predetermined and ascertainable with the fuse temperature sensor 11 switching temperature in a conventional manner in a control loop involving the ambient temperature sensor 10 as the actual value, the temperature controller 9 upon reaching and / or exceeding the switching temperature, taking into account Sensor values of the fuse temperature sensor 11 switches to another control algorithm and de-regulates the heating power of the heating element 5 to protect the excess temperature fuse 6.
- the switching temperature at the temperature controller 9 is adjustable.
- the control algorithm for the temperature range below the switching temperature and / or the control algorithm for a range above the switching temperature on the temperature controller 9 are separately adjustable.
Landscapes
- Control Of Resistance Heating (AREA)
- Control Of Temperature (AREA)
Description
Die Erfindung betrifft eine elektrische, explosionsgeschützte Heizung, insbesondere zur Innenraumbeheizung eines Instrumenten-Schutzschranks nach dem Oberbegriff des Anspruchs 1.The invention relates to an electric, explosion-proof heating, in particular for heating the interior of an instrument protective cabinet according to the preamble of claim 1.
Allgemein ist von einer solchen explosionsgeschützten Heizung zu fordern, dass sie bei guter Effektivität wenig Raum beansprucht, an unterschiedliche Gegebenheiten anpassbar ist, eine eingestellte Temperatur möglichst genau geregelt einhält und Schutzvorschriften hinsichtlich eines Berührungsschutzes und eines Explosionsschutzes eingehalten werden.In general, such an explosion-proof heater requires that it requires little space with good effectiveness, that it can be adapted to different conditions, that a set temperature be controlled as precisely as possible, and that protection regulations with regard to contact protection and explosion protection be maintained.
Eine bekannte, gattungsgemäße Heizung (
Solche Heizungen sind den konkreten Einsatzbedingungen so anzupassen und so zu dimensionieren, dass bei einem temperaturgeregelten Betrieb durch den Explosionsschutz vorgegebene Grenztemperaturen nicht überschritten werden. Bei ungünstigen Gegebenheiten und einem Zusammenwirken ungünstiger Randbedingungen sind aber insbesondere bei einem Überschwingen der Temperaturregelung ohne Zusatzmaßnahmen unzulässige Überhitzungen an der Heizung nicht auszuschließen. Um dennoch Explosionsschutzvorschriften sicher einhalten zu können, unterbrechen in einem solchen Fall die vorstehend genannten Übertemperatursicherungen den elektrischen Heizkreis. Bisher werden als Übertemperatursicherungen reversible Schaltelemente verwendet, die nach einem Ansprechen in ihre Sicherungsfunktion wieder rücksetzbar sind. Es sind auch von Hand wechselbare Schmelzsicherungen bekannt.Such heaters are the specific conditions of use to be adapted and dimensioned so that in a temperature-controlled operation by the explosion protection specified limit temperatures are not exceeded. In unfavorable conditions and a combination of unfavorable boundary conditions, however, excessive overheating of the heater can not be ruled out, especially in the event of overshoot of the temperature control without additional measures. Nevertheless, in order to be able to safely comply with explosion protection regulations, the above-mentioned overtemperature safeguards interrupt the electrical heating circuit in such a case. So far, reversible switching elements are used as overtemperature fuses, which are resettable after a response in their backup function. There are also known by hand exchangeable fuses.
Nach dem Ansprechen einer Übertemperatursicherung kann diese bisher einfach und schnell durch ein Rücksetzen der Sicherung oder einen Sicherungsaustausch in ihrer Funktion wieder hergestellt werden.After the response of an overtemperature protection, this can be easily and quickly restored by resetting the fuse or a fuse replacement in their function.
Gemäß neuer Richtlinien sind mit Übergangsfristen bei vergussgekapselten Heizungen nur noch Schmelzsicherungen als Übertemperatursicherungen zulässig. Im Anspruch 1 wird von einem solchen Stand der Technik ausgegangen.According to new directives, with transitional periods in case of encapsulated heaters, only fuses are permitted as overtemperature fuses. In claim 1 is based on such a prior art.
Ersichtlich ist bei einer solchen miteingegossenen Schmelzsicherung nach deren Ansprechen ein Rücksetzen der Sicherung oder ein Austausch nicht mehr möglich, so dass dann ein kostenintensiver Komplettaustausch einer solchen Heizung erforderlich wird.It is evident that with such a miteingegossenen fuse after their response resetting the fuse or replacement is no longer possible, so that then a costly complete replacement of such a heater is required.
Aufgabe der Erfindung ist es, Maßnahmen vorzuschlagen, womit ein solcher Komplettaustausch für die Heizung in der Regel vermeidbar ist.The object of the invention is to propose measures with which such a complete replacement for the heating is usually avoidable.
Diese Aufgabe wird mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved with the features of claim 1.
Gemäß Anspruch 1 ist im Bereich der Schmelzsicherung ein Sicherungs-Temperaturfühler angeordnet und mit in die Aufnahmeöffnung eingegossen. Der Sicherungs-Temperaturfühler ist mit Anschlussleitungen mit dem Temperaturregler verbunden. Mit diesem Sicherungs-Temperaturfühler wird die aktuelle Temperatur der Schmelzsicherung für einen Vergleich mit einer im Temperaturregler festgelegten Umschalttemperatur ermittelbar. Diese Umschalttemperatur wird so gewählt, dass sie in einem ausreichenden Sicherheits-Temperaturabstand unterhalb der Ansprechtemperatur der Schmelzsicherung liegt.According to claim 1, a fuse temperature sensor is arranged in the region of the fuse and cast with in the receiving opening. The fuse temperature sensor is connected with connecting cables to the temperature controller. This fuse temperature sensor can be used to determine the current temperature of the fuse for comparison with a changeover temperature set in the temperature controller. This switching temperature is selected so that it lies within a sufficient safety temperature distance below the response temperature of the fuse.
Der Temperaturregler ist so ausgelegt, dass er in einem Temperaturbereich unterhalb der vorgegebenen und mit dem Sicherungs-Temperaturfühler ermittelbaren Umschalttemperatur in üblicher Weise in einem ersten Regelalgorithmus unter Einbeziehung des Umgebungs-Temperaturfühlers als Istwertgeber arbeitet. Ein Erreichen und/oder Überschreiten dieser vorgegebenen Umschalttemperatur wird vom Temperaturregler durch Auswertung der Fühlerwerte des Sicherungs-Temperaturfühlers erkannt, worauf der Temperaturregler in einen anderen zweiten Regelalgorithmus umschaltet und zum Schutz der Schmelzsicherung die Heizleistung des Heizelements abregelt. Nach einem darauffolgenden Unterschreiten der Umschalttemperatur, gegebenenfalls mit einem im Regelalgorithmus vorgebbaren Unterschreitungsabstand, schaltet dann der Temperaturregler wieder auf den ersten Regelalgorithmus um.The temperature controller is designed so that it works in a temperature range below the predetermined and can be determined with the fuse temperature sensor switching temperature in a conventional manner in a first control algorithm, including the ambient temperature sensor as an actual value. A reaching and / or exceeding this predetermined switching temperature is detected by the temperature controller by evaluating the sensor values of the fuse temperature sensor, whereupon the temperature controller switches to another second control algorithm and de-regulates the heating power of the heating element to protect the fuse. After a subsequent undershooting of the switching temperature, optionally with a predeterminable in the control algorithm underflow distance, then the temperature controller switches back to the first control algorithm.
Die Umschalttemperatur ist dabei so zu wählen, dass auch bei ungünstigen Verhältnissen, beispielsweise bei einem möglichen Überschwingen der Temperaturregelung nach dem ersten Regelalgorithmus bei einer initialen Aufheizphase mit noch nicht eingeschwungener Temperatur, die Ansprechtemperatur der Schmelzsicherung aufgrund der Abregelung der Heizleistung des Heizelements sicher nicht erreicht wird.The switching temperature is to be chosen so that even with unfavorable conditions, for example in a possible overshoot of the temperature control according to the first control algorithm at an initial heating phase with not yet steady temperature, the response temperature of the fuse due to the reduction of the heating power of the heating element is certainly not reached ,
Damit wird auch bei ungünstigen Betriebsbedingungen ein Ansprechen und damit eine Zerstörung der eingegossenen Schmelzsicherung verhindert. Die Funktion der Heizung bleibt erhalten, wobei lediglich in der Regel unschädliche, etwas größere Aufheizzeiten auftreten können. Die Funktion der Schmelzsicherung als übergeordnetes Explosionsschutz-Sicherungselement wird durch den zusätzlichen Einsatz des Sicherungs-Temperaturfühlers und der modifizierten Regelung nicht angetastet und bleibt in jedem Fall erhalten, so dass bei besonders extremen Bedingungen durch ein Ansprechen der Schmelzsicherung die Explosionsschutzvorschriften in jedem Fall eingehalten werden.This prevents a response and thus destruction of the cast fuse even under unfavorable operating conditions. The Function of the heating is maintained, with only harmless, slightly larger heating times can usually occur. The function of the fuse as a higher-level explosion protection fuse element is not affected by the additional use of the fuse temperature sensor and the modified control and is retained in any case, so that under particularly extreme conditions by a response of the fuse the explosion protection regulations are observed in any case.
Zusammenfassend ist festzustellen, dass mit der erfindungsgemäßen Anordnung bei allen üblichen Bedingungen ein den Explosionsvorschriften genügender Heizungsbetrieb gewährleistet ist, da ein Ansprechen von vorgeschriebenen Übertemperatursicherungen schon im Vorfeld durch einen Abregelungsalgorithmus verhindert wird. Kontrollen, wie sie beim Stand der Technik bisher erforderlich sind, ob solche Übertemperatursicherungen angesprochen haben können weitgehend entfallen ebenso wie kostenintensive Austauschaktionen für komplette Heizungen. Die dazu erfindungsgemäß vorgeschlagenen Maßnahmen erfordern demgegenüber nur einen geringen Mehraufwand bei der Herstellung erfindungsgemäßer Heizungen.In summary, it should be noted that with the arrangement according to the invention under all normal conditions a sufficient explosion regulations heating operation is guaranteed, since a response of prescribed over-temperature protection is already prevented in advance by a Abregelungsalgorithm. Controls, as they have been required in the prior art, whether such over-temperature fuses have addressed can largely account for as well as costly replacement actions for complete heaters. In contrast, the measures proposed according to the invention require only a small additional expenditure in the production of heating systems according to the invention.
Gemäß Anspruch 2 kann die erfindungsgemäße Anordnung bevorzugt in einem an sich bekannten Heizkörper installiert werden, der als langgestreckter Körper mit einem axialen Aufnahmeraum und radial abstehenden Heizlamellen ausgebildet ist.According to
Für eine gute Wärmeleitung wird ein solcher Heizkörper nach Anspruch 3 vorzugsweise aus Metall hergestellt. Dazu ist es bekannt, den Heizkörper insgesamt als Gussteil herzustellen oder wie in der
Nach Anspruch 4 kann als Sicherungs-Temperaturfühler ein kostengünstiger NTC-Widerstand verwendet werden.According to
Für übliche Einsätze ist es ausreichend die Umschalttemperatur in der Regelschaltung fest vorzugeben. Eine bessere Anpassung an unterschiedliche Gegebenheiten ist nach Anspruch 5 möglich, wenn die Umschalttemperatur am Temperaturregler einstellbar ist. Auch bei einer solchen einstellbaren Umschalttemperatur wird die übergeordnete Sicherheitsfunktion der eingegossenen Schmelzsicherung nicht berührt.For normal applications, it is sufficient to specify the switching temperature in the control circuit. A better adaptation to different conditions is possible according to
Für übliche Anwendungsfälle können die Regelalgorithmen fest vorgegeben werden. Nach Anspruch 6 ist es für weitere Anpassungen unter Umständen zweckmäßig, den Regelalgorithmus für den Temperaturbereich unter der Umschalttemperatur und/oder den Regelalgorithmus für den Bereich über der Umschalttemperatur einstellbar zu machen.For standard applications, the control algorithms can be fixed. According to
Anhand einer Zeichnung wird die Erfindung näher erläutert.Reference to a drawing, the invention is explained in detail.
Die einzige Figur zeigt schematisch eine elektrische, explosionsgeschützte Heizung, z. B. zur Innenraumbeheizung eines hier nicht dargestellten Instrumenten-Schutzschranks. Diese Heizung umfasst einen Heizkörper 2 mit einer Aufnahmeöffnung 3, wobei der Heizkörper 2 als ein langgestreckter Körper mit einem axialen Aufnahmeraum als Aufnahmeraumöffnung sowie mit radial abstehenden Heizlamellen 4 ausgebildet ist.The single figure shows schematically an electric, explosion-proof heating, z. As for the interior heating of a not shown here instrument protective cabinet. This heater comprises a
Der Heizkörper 2 kann beispielsweise aus Metall gegossen sein.The
Wie dies der schematischen Darstellung der einzigen Figur weiter entnommen werden kann, umfasst die elektrische, explosionsgeschützte Heizung 1 ferner ein Heizelement 5 und eine in Reihe geschaltete Schmelzsicherung als Übertemperatursicherung 6 mit einer bestimmten Ansprechtemperatur.As can be further seen from the schematic illustration of the single figure, the electrical, explosion-proof heater 1 further comprises a
Das Heizelement 5 und die Übertemperatursicherung 6 sind in die Aufnahmeöffnung 3 eingesetzt und dort mittels einer Vergussmasse 7 vergossen.The
Der einzigen Figur kann zudem weiter entnommen werden, dass das Heizelement 5 mit der in Reihe geschalteten Übertemperatursicherung 6 über elektrische Anschlussleitungen 8, 14 mit einem Temperaturregler 9 verbunden ist, an den zudem ein Umgebungs-Temperaturfühler 10 als Istwertgeber angeschlossen ist.The single figure can also be further seen that the
Im Bereich der Übertemperatursicherung 6 ist ferner ein durch einen NTC-Widerstand gebildeter Sicherungs-Temperaturfühler 11 angeordnet und mit in die Aufnahmeöffnung 3 eingegossen, der ebenfalls mit Anschlussleitungen 12, 13 mit dem Temperaturregler 9 verbunden ist.In the area of the
Mit dem Sicherungs-Temperaturfühler 11 kann die aktuelle Temperatur der Übertemperatursicherung 6 für einen Vergleich mit einer vorgegebenen Umschalttemperatur ermittelt werden, wobei die Umschalttemperatur mit einem Sicherheits-Temperaturabstand unterhalb der Ansprechtemperatur der Übertemperatursicherung 6 festgelegt ist.With the
Der Temperaturregler 9 arbeitet in einem Temperaturbereich unterhalb der vorgegebenen und mit dem Sicherungs-Temperaturfühler 11 ermittelbaren Umschalttemperatur in üblicher Weise in einem Regelkreis unter Einbeziehung des Umgebungs-Temperaturfühlers 10 als Istwertgeber, wobei der Temperaturregler 9 bei Erreichen und/oder Überschreiten der Umschalttemperatur unter Berücksichtigung der Fühlerwerte des Sicherungs-Temperaturfühlers 11 in einen anderen Regelalgorithmus umschaltet und zum Schutz der Übertemperatursicherung 6 die Heizungsleistung des Heizelements 5 abregelt.The
Es kann ferner vorgesehen sein, dass die Umschalttemperatur am Temperaturregler 9 einstellbar ist. Ebenso kann vorgesehen sein, dass der Regelalgorithmus für den Temperaturbereich unter der Umschalttemperatur und/oder der Regelalgorithmus für einen Bereich über der Umschalttemperatur am Temperaturregler 9 getrennt einstellbar sind.It may also be provided that the switching temperature at the
Claims (6)
- Electric, explosion-proof heater, in particular for heating the interior of an instrument-protection cabinet,
having a heating body with an accommodation opening,
having a heating element and a fuse, which is connected in series, as an overtemperature-protection means with a specific response temperature, with
the heating element and the overtemperature-protection means being inserted into the accommodation opening and encapsulated there, and
the heating element with the fuse which is connected in series being connected via electrical connection lines to a temperature controller to which an ambient-temperature sensor in the form of an actual-value transmitter is also connected,
characterized
in that a fuse-temperature sensor (11) is arranged in the region of the fuse (6) and is also integrally encapsulated in the accommodation opening (3) and is connected to the temperature controller (9) by connection lines (12, 13) in such a way
that the current temperature of the fuse (6) can be determined by the fuse-temperature sensor (11) for comparison with a changeover temperature, and the changeover temperature is defined by a safety temperature difference below the response temperature of the fuse (6), and
in that the temperature controller (9) operates in a temperature range below the predefined changeover temperature which can be determined by the fuse-temperature sensor (11) in a customary manner in a control loop including the ambient-temperature sensor (10) as the actual-value transmitter, and the temperature controller (9) changes over to another control algorithm when the changeover temperature is reached and/or exceeded, taking into account the sensor values of the fuse-temperature sensor (11), and reduces the heating power of the heating element (5) in order to protect the fuse (6). - Electric, explosion-proof heater according to Claim 1, characterized in that the heating body (2) is an elongate body with an axial accommodation space (3) and radially protruding heating lamellae (4).
- Electric, explosion-proof heater according to Claim 1 or 2, characterized in that the heating body (2) is cast from metal.
- Electric, explosion-proof heater according to one of Claims 1 to 3, characterized in that the fuse-temperature sensor (11) is an NTC resistor.
- Electric, explosion-proof heater according to one of Claims 1 to 4, characterized in that the changeover temperature can be adjusted on the temperature controller (9).
- Electric, explosion-proof heater according to one of Claims 1 to 5, characterized in that the control algorithm for the temperature range below the changeover temperature and/or the control algorithm for the range above the changeover temperature can be separately adjusted on the temperature controller (9).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10118922A DE10118922C1 (en) | 2001-04-18 | 2001-04-18 | Process for securing and regulating an electrical, explosion-proof heating and device for carrying out the process |
| DE10118922 | 2001-04-18 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1251718A2 EP1251718A2 (en) | 2002-10-23 |
| EP1251718A3 EP1251718A3 (en) | 2006-09-20 |
| EP1251718B1 true EP1251718B1 (en) | 2008-04-02 |
Family
ID=7681800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02003944A Expired - Lifetime EP1251718B1 (en) | 2001-04-18 | 2002-02-22 | Electrical, explosion protected heater, particularly for the heating of the inner space of a protected cupboard containing instruments |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US6720535B2 (en) |
| EP (1) | EP1251718B1 (en) |
| DE (2) | DE10118922C1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022102836A1 (en) | 2022-02-08 | 2023-08-10 | Turck Holding Gmbh | Device and method for monitoring a sensor |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104994603A (en) * | 2015-07-16 | 2015-10-21 | 广东志高空调有限公司 | Electric heating protection system |
| CN111600222B (en) * | 2020-06-16 | 2022-03-29 | 河南里程碑科技有限公司 | High-efficient heat dissipation type distribution automation monitor terminal |
| CN115628322B (en) * | 2022-10-26 | 2023-05-16 | 南京市锅炉压力容器检验研究院 | Intelligent control method for fusible alloy plug |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4075678A (en) * | 1976-02-13 | 1978-02-21 | American Thermostat Corporation | Fail safe circuit for heat generating device |
| DE3633682A1 (en) * | 1986-10-03 | 1988-04-14 | Hess Joachim | Heating block for heating valve blocks and measuring instruments |
| DE3814145C2 (en) * | 1988-04-27 | 1998-07-23 | Hess Joachim | Device for supplying or removing heat |
| DE4344341A1 (en) * | 1993-12-23 | 1995-07-06 | Elpag Ag Chur | Tubular heating element with overload protection and temperature sensor |
| JPH0851722A (en) * | 1994-08-08 | 1996-02-20 | Canon Inc | Conduction controller for heater |
| JPH1062268A (en) * | 1996-08-26 | 1998-03-06 | Yutaka Denshi Kk | Hot water heater for ornamental fish |
| JP2000010435A (en) * | 1998-06-17 | 2000-01-14 | Canon Inc | Heating device, thermal fixing device and image forming device |
| DE19941901A1 (en) | 1999-09-02 | 2001-03-29 | Bleckmann Gmbh Lamprechtshause | Tubular heating element with NTC / PTC protection |
| DE19941961B4 (en) * | 1999-09-03 | 2008-10-23 | Volkswagen Ag | navigation system |
-
2001
- 2001-04-18 DE DE10118922A patent/DE10118922C1/en not_active Expired - Lifetime
-
2002
- 2002-02-22 EP EP02003944A patent/EP1251718B1/en not_active Expired - Lifetime
- 2002-02-22 DE DE50211999T patent/DE50211999D1/en not_active Expired - Lifetime
- 2002-04-18 US US10/125,274 patent/US6720535B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022102836A1 (en) | 2022-02-08 | 2023-08-10 | Turck Holding Gmbh | Device and method for monitoring a sensor |
| WO2023151878A1 (en) | 2022-02-08 | 2023-08-17 | Turck Holding Gmbh | Device and method for monitoring a sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1251718A2 (en) | 2002-10-23 |
| US6720535B2 (en) | 2004-04-13 |
| DE10118922C1 (en) | 2003-04-30 |
| EP1251718A3 (en) | 2006-09-20 |
| DE50211999D1 (en) | 2008-05-15 |
| US20020158062A1 (en) | 2002-10-31 |
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