EP0244808A1 - Anordnung zur Signalübertragung in einer Messanordnung - Google Patents

Anordnung zur Signalübertragung in einer Messanordnung Download PDF

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Publication number
EP0244808A1
EP0244808A1 EP87106454A EP87106454A EP0244808A1 EP 0244808 A1 EP0244808 A1 EP 0244808A1 EP 87106454 A EP87106454 A EP 87106454A EP 87106454 A EP87106454 A EP 87106454A EP 0244808 A1 EP0244808 A1 EP 0244808A1
Authority
EP
European Patent Office
Prior art keywords
wire line
signal
transmitter
communication
interface
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.)
Withdrawn
Application number
EP87106454A
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German (de)
English (en)
French (fr)
Inventor
Gustav Wetzel
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.)
Endress and Hauser SE and Co KG
Original Assignee
Endress and Hauser SE and Co KG
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 Endress and Hauser SE and Co KG filed Critical Endress and Hauser SE and Co KG
Publication of EP0244808A1 publication Critical patent/EP0244808A1/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/16—Electric signal transmission systems in which transmission is by pulses
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage

Definitions

  • the invention relates to an arrangement for signal transmission in a measuring arrangement with a transmitter, which is connected to a remote evaluation device by a two-wire line, on the one hand the DC energy required for the operation of the transmitter from the evaluation device to the transmitter and on the other hand the measured value signal representing the measured variable from Transmitters are transmitted to the evaluation device, the transmitter being connected to the two-wire line via a transmitter interface, which takes the direct current energy required by the transmitter from the two-wire line and applies the measured value signal to the two-wire line, and the evaluation device with the two-wire line via an evaluation interface is connected, which is used to apply the DC supply voltage to the two-wire line and Reception of the measured value signal transmitted via the two-wire line is formed, and with at least one communication unit which can be connected to the two-wire line in parallel with the transmitter via a communication interface, in each case in the transmitter interface, in the evaluation interface and in each communication interface there is a communication interface circuit which contains a signal transmitter for transmitting a communication signal distinguishable from the measured value signal via the two-wire
  • the communication unit which can also be connected to the two-wire line and can send and receive communication signals via the two-wire line, makes it possible, in particular, to carry out adjustment, setting, checking or maintenance work at the location of the transmitter or from another location using the Perform evaluation device.
  • the communication unit is, for example, a calculator-like device with a keyboard and with a numeric or alphanumeric display. By actuating the keyboard, the operator can call up the required information from the evaluation device, and the information transmitted in response to the query from the evaluation device is made visible on the display of the communication unit.
  • the communication signals transmitted for this information exchange are pulse sequences which go over the two-wire line and are modulated in accordance with the information to be transmitted are.
  • the problem here is that the measured value signal can be impaired or disturbed by the communication signals. This applies in particular if the energy for the communication signals is taken from the same energy source contained in the evaluation device, which also supplies the direct current energy for the transmitter and the energy for the measured value signals, as is the case with the generally customary measuring arrangements in which the measured value signal is formed by a direct current which is variable between 4 and 20 mA and which also contains the supply direct current for the transmitter.
  • Another limitation of known arrangements of this type is the limited communication options; Usually, the communication units can only exchange information with a remote station, for example with the evaluation device.
  • the object of the invention is to provide an arrangement of the type specified in the introduction, in which any number of subscriber stations connected to the two-wire line, which also include the transmitter and the evaluation device, can exchange communication signals with one another, without the simultaneous transmission of the measured value signal over the same two-wire line is disturbed or impaired.
  • this object is achieved in that the signal transmitter of each communication interface circuit for pulse-shaped reduction of the DC supply voltage on the two-wire line is designed according to a pulse modulation representing the communication signal, and in that the signal receiver of each communication interface circuit is adapted to the pulse-shaped voltage changes on the two-wire line appeals.
  • the signal transmitter of each communication interface circuit impulses the voltage applied by the evaluation device to the two-wire line, and the pulse-shaped voltage changes that occur on the two-wire line can be received by the signal receivers of all communication interface circuits.
  • a communication unit can not only connect to the transmitter or the evaluation device, but also to other communication units connected to the same two-wire line.
  • the transmitter and the evaluation device regardless of the presence of a communication unit, can also exchange communication signals in both transmission directions in addition to the transmission of the measured value signal.
  • the transmitter can supply the evaluation device with additional information which can be used for evaluating the measurement signal and for monitoring the operation of the transmitter, and the evaluation device can influence the operation of the transmitter by means of control signals.
  • the pulsed voltage changes on the two-wire line can be generated and received with very simple and reliable circuits.
  • the amplitude of the pulse-shaped voltage changes can be very large, as a result of which a very high level of interference immunity for the signal transmission is achieved.
  • the voltage on the two-wire line can be brought to zero by a complete short circuit with each voltage pulse.
  • the transmitter 10 contains a sensor 13 for detecting a physical measured variable to be measured (eg temperature, pressure, humidity, fill level) and an electronic transducer 14 connected to the sensor 13 which emits an electrical signal representing the instantaneous value of the measured variable.
  • the transmitter 10 does not contain its own energy source, but obtains the direct current energy required for its operation via the two-wire line 11 from a voltage source 15 contained in the evaluation device 12.
  • a measured value signal representing the instantaneous value of the measured variable is transmitted from the transmitter 10 to the evaluation device 12 via the same two-wire line.
  • the transducer 10 is connected to the two-wire line 11 via a transducer interface 16, which on the one hand ensures the energy supply of the transducer 10 from the two-wire line 11 and on the other hand converts the output signal of the transducer 14 into a measured value signal suitable for transmission via the two-wire line 11.
  • the measured value signal is the direct current I M flowing via the two-wire line 11, which is composed of the direct current supply I 0 of the transmitter and a correction current I K.
  • the correction current I K is likewise taken from the voltage source 15 and set by the transmitter 10, taking into account the respective magnitude of the supply direct current I 0, so that the total current I M between the current values 4 and 20 mA represents the measured value to be transmitted.
  • the transmitter 10 also contains communication electronics 17, which is likewise connected to the two-wire line via the transmitter interface 16.
  • An evaluation interface 18 is used to connect the evaluation device 12 to the two-wire line 11, which on the one hand effects the transmission of the direct current energy required by the transmitter 10 from the voltage source 15 to the two-wire line 11 and on the other hand from the total current I M flowing via the two-wire line 11 for display purposes of the measured value or a signal suitable for further processing.
  • the evaluation device 12 further includes communication electronics 19, which is connected to the two-wire line 11 via the asuvalue interface 18.
  • a communication unit 20 is also shown, which is connected in parallel to the transmitter 10 to the two-wire line 11 and is designed such that it can carry out an information exchange with the transmitter 10 or with the evaluation device 12 without the normal operation of the measuring arrangement thereby is affected.
  • the communication unit 20 is a calculator-like device with a keyboard 21 and a digital display 22 and with the electronics required for signal processing.
  • the connection to the two-wire line 11 takes place via a communication interface 23 and a two-wire connecting line 24, which can be connected to the two-wire line 11 as required by means of terminals 25, 26.
  • the communication unit 20 is equipped with its own energy source (e.g. battery).
  • its own energy source e.g. battery
  • Fig. 2 shows the circuit diagrams of the three interfaces 16, 18 and 23 of Fig. 1 in more detail.
  • the voltage of the two-wire line 11 is applied to the terminals of a capacitor 29 via a diode 27 and a constant current generator 28, to which a zener diode 30 is connected in parallel.
  • the Zener diode 30 determines the operating voltage U B for the electronics of the transmitter.
  • the capacitor 29 serves as an energy store, which bridges the energy supply in the event of a voltage reduction or a short circuit on the two-wire line 11.
  • the diode 27 prevents in In this case, the capacitor 29 is discharged via the two-wire line 11.
  • the transmitter interface 16 contains a shunt branch 31 which contains a controllable constant current generator 32.
  • a continuous direct current flows through the shunt branch 31, which is likewise taken from the voltage source 15 and is superimposed on the supply direct current I 0 on the two-wire line 11.
  • the constant current generator 32 is controlled by a continuously variable output signal of the measuring transducer 14 so that the direct current flowing through the shunt branch 31 forms the correction current I K which, together with the supply current I 0, forms the measuring current I M which varies between 4 and 20 mA.
  • the constant current generator 28 supplies the constant supply direct current I 0 for the electronics of the transmitter.
  • the current determined by the constant current generator 28 is controlled by the constant current generator 32 or is permanently set to the current value I 0 .
  • the constant current generators 28 and 32 can be combined in one unit. Instead of the constant current generator 28, a voltage regulator can also be used.
  • a voltage can thus be tapped at the resistor 33 which is proportional to the measuring current I M and contains the measured value information. This voltage can be used to display the measured value or processed in any way to evaluate the measured value information.
  • the parts of the transmitter interface 16 and the evaluation interface 18 described so far correspond to a customary configuration of measuring arrangements with a two-wire connection, in which the measured value information is transmitted by a direct current that varies between 4 and 20 mA.
  • the communication interface 23 of the communication unit 20 essentially consists of a communication interface circuit 40 connected to the electronics 34 of the communication unit.
  • a communication interface circuit 50 of completely the same type is arranged in addition to the usual components described above in the transmitter interface 16, and
  • the evaluation interface 18 contains a further communication interface circuit 60 of the same type. Since the three communication interface circuits 40, 50 and 60 have the same structure and the same mode of operation, the following description of the communication interface circuit 40 also applies to the two other communication Interface circuits 50 and 60.
  • the communication interface circuit 40 contains a signal transmitter 41 and a signal receiver 42, which are connected to the two-wire line 11 via the connecting line 24.
  • the communication interface circuit 50 of the transmitter 10 contains a signal transmitter 51 and a signal receiver 52
  • the communication interface circuit 60 of the evaluation device 12 contains a signal transmitter 61 and a signal receiver 62.
  • the signal generator 41 consists essentially of a controlled shunt branch 43, which bridges the connecting line 24 and thus also the two-wire line 11.
  • a switch which is a switching transistor 44 in the example shown.
  • the electronics 34 apply a control signal to the base of the switching transistor 44 which is pulse-modulated in accordance with the information to be transmitted.
  • a current limiter 35 is inserted in series with the voltage source 15 in the two-wire line 11 in the evaluation interface 18.
  • the current limiter 35 can be formed by a sufficiently high resistance, but for a reason which will be explained later, a controlled constant current generator is used as the current limiter in the embodiment shown.
  • each current pulse generated by the signal generator 41 thus corresponds to a negatively directed voltage pulse on the two-wire line 11, as shown in diagram A in FIG. 3, and the sequence of these voltage pulses is shaped by the control signal supplied to the switching transistor 44.
  • the signal receiver 42 of the communication interface circuit 40 is designed such that it responds to negatively directed pulse-shaped voltage changes of the type shown in diagrams A and B of FIG. 3.
  • it has a Schmitt trigger 46, to which the voltage of the two-wire line 11 is supplied via an RC element consisting of a capacitor 47 and a resistor 48.
  • the Schmitt trigger 46 therefore only responds to pulsed voltage changes on the two-wire line and converts this into a digital signal, which is fed to the electronics 34.
  • the signal generator 51 in the communication interface circuit 50 of the transmitter 10 under the control of the communication electronics 17 on the two-wire line 11, generates negatively directed pulse-shaped voltage changes, to which the signal receiver 42 in the communication unit 20 and the signal receiver 62 in the evaluation device 12 respond
  • the signal generator 61 in the communication interface circuit 60 of the evaluation device 12 generates, under the control of the communication electronics 19 on the two-wire line 11, negatively directed pulse-shaped voltage changes to which the signal receivers 42, 52 of the other two communication interface circuits 40, 50 respond.
  • All units connected to the two-wire line 11 can connect to one another at will and exchange information via the two-wire line.
  • All communication interface circuits are formed in an identical manner, and each interface can receive the communication signals sent by each other interface.
  • suitable coded address signals ensure that each subscriber station only evaluates the information intended for it.
  • All interfaces use the same energy source for the generation of the communication signals, namely the voltage source 15 in the evaluation device, and they generate the communication signals in the same way, namely by pulsed reduction of the voltage on the two-wire line.
  • the use of voltage pulses as communication signals allows a clear and unambiguous distinction from the measured value information, which is represented by a current value.
  • the information (data) to be transmitted by the communication signals can be contained, for example, in the repetition frequency of the voltage pulses (pulse frequency modulation), in coded pulse trains (pulse code modulation) or in a combination of these two types of modulation.
  • the measuring current I M transmitted via the two-wire line is interrupted during each negative voltage pulse of a communication signal.
  • an instantaneous value memory (“sample &hold") 36 is provided in the evaluation interface 18 of FIG. 2, which continuously stores the instantaneous value of the measuring current I M which flows over the two-wire line 11 when there are no communication signals.
  • a resistor 37 is inserted into the line to detect the value of the measuring current I M , and the voltage tapped at the resistor 37 is fed to the instantaneous value memory 36.
  • the output of the instantaneous value memory 36 is connected via a switch 38 controlled by the output of the signal receiver 62 of the communication interface circuit 60 to an actuator 39 which influences the setting of the constant current generator forming the current limiter 35.
  • the switch 38 is closed each time a voltage pulse is received, and the actuator 39 then sets the current value determined by the current limiter 35 to the current value stored in the instantaneous value memory 36.
  • the same current flows through the resistor 33 as before the voltage pulse arrived. Since the measuring current I M usually changes only slowly, the display is not noticeably falsified by the temporary bridging.
  • the signal transmission described with reference to FIG. 2 requires a minimum of components for the signal generation and the signal reception. Furthermore, due to the high signal level, relatively low susceptibility to interference is to be expected. Finally, signal transmission by reducing the normal voltage is particularly advantageous for use in potentially explosive environments, where signal transmission can cause problems due to pulsed voltage increases.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
EP87106454A 1986-05-07 1987-05-05 Anordnung zur Signalübertragung in einer Messanordnung Withdrawn EP0244808A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3615463 1986-05-07
DE19863615463 DE3615463A1 (de) 1986-05-07 1986-05-07 Anordnung zur signaluebertragung in einer messanordnung

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EP0244808A1 true EP0244808A1 (de) 1987-11-11

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EP87106454A Withdrawn EP0244808A1 (de) 1986-05-07 1987-05-05 Anordnung zur Signalübertragung in einer Messanordnung

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EP (1) EP0244808A1 (ja)
JP (1) JPS63500831A (ja)
DE (1) DE3615463A1 (ja)
WO (1) WO1987007064A1 (ja)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0273506A1 (en) * 1986-12-16 1988-07-06 North American Philips Corporation Two lead bidirectional stepping motor control
EP0347034A2 (en) * 1988-06-17 1989-12-20 Hewlett-Packard Company Improved sensor
DE3842484A1 (de) * 1988-12-16 1990-06-21 Bayerische Motoren Werke Ag Kommunikationseinrichtung fuer kraftfahrzeuge
EP0387601A1 (de) * 1989-03-16 1990-09-19 KNICK ELEKTRONISCHE MESSGERÄTE GMBH & CO. Signalübertragungssystem
EP0422663A2 (en) * 1989-10-13 1991-04-17 Hitachi, Ltd. Communicator for field instruments and method of supplying power to this communicator
EP0591926A2 (en) * 1992-10-05 1994-04-13 Fisher Controls International, Inc. Communication system and method
EP0744724A1 (de) * 1995-05-24 1996-11-27 Endress + Hauser Gmbh + Co. Anordnung zur leitungsgebundenen Energieversorgung eines Signalgebers vom Singnalempfänger
DE19905071A1 (de) * 1999-02-08 2000-08-10 Siemens Ag Meßumformer sowie Verfahren zur Diagnose der Versorgung eines Meßumformers
US6272446B1 (en) 1995-12-22 2001-08-07 Bruel & Kjaer Sound & Vibration Measurement A/S System and a method for measuring a continuous signal
DE10034684A1 (de) * 2000-07-17 2002-01-31 Endress Hauser Gmbh Co Meßeinrichtung zur Messung einer Prozeßvariablen
US6703943B1 (en) 1998-09-07 2004-03-09 Robert Lalla Assembly for signal transfer between a receiving station and a transmitting station as well as for power supply of the transmitting station
CN108291928A (zh) * 2015-11-24 2018-07-17 菲尼克斯电气公司 感应式电流互感器
WO2022028701A1 (de) * 2020-08-06 2022-02-10 Vega Grieshaber Kg Elektronische vorrichtung

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DE3843966A1 (de) * 1988-12-24 1990-06-28 Heidelberger Druckmasch Ag Einrichtung zum ankoppeln von zusatzgeraeten
GB2257787B (en) * 1991-07-03 1994-08-03 Motorola Inc Sensor signal conditioning circuit
DE4123828C2 (de) * 1991-07-18 1997-06-19 Balluff Gebhard Feinmech Berührungslos arbeitender Näherungsschalter
DE4341600C2 (de) * 1993-12-07 1998-08-13 Ifm Electronic Gmbh Elektronisches Schaltgerät
DE19955758A1 (de) * 1999-11-19 2001-05-31 Infineon Technologies Ag Verfahren zur Kommunikation mit einem eingebauten Sensor, insbesondere einem Drehzahlsensor
DE10018706A1 (de) * 2000-04-14 2001-10-25 Siemens Ag Verfahren zur Datenübertragung und Einrichtung zur Durchführung des Verfahrens
DE10037996C2 (de) * 2000-08-03 2003-04-17 Siemens Ag Elektronisches Gerät, insbesondere Feldgerät
DE10045097B4 (de) * 2000-09-12 2004-05-13 Siemens Ag Sensorkopf, Steuermodul und Mehrfachsensor
DE10046584C2 (de) * 2000-09-20 2003-04-17 Siemens Vdo Automotive Sas Sensoreinrichtung
DE10105473A1 (de) * 2001-02-05 2002-10-10 Endress & Hauser Gmbh & Co Kg Vorrichtung zur Messung und/oder Überwachung einer Prozeßgröße
DE10113716C2 (de) * 2001-03-19 2003-05-08 Balluff Gmbh Kommunikations-Schnittstelle für eine Wegmeßeinrichtung
DE10119471A1 (de) 2001-04-20 2002-10-31 Micronas Gmbh Verfahren und Zweidrahtsensor zur Messung einer physikalischen Größe
DE50210241D1 (de) * 2001-05-10 2007-07-12 Continental Teves Ag & Co Ohg Raddrehzahlsensoranordnung mit übertragung von zusatzinformationen
DE10145520B4 (de) * 2001-09-14 2004-09-09 Vega Grieshaber Kg Schaltungsanordnung zur Spannungsversorgung eines Zweidrahtsensors
DE10146204A1 (de) * 2001-09-19 2003-04-10 Grieshaber Vega Kg Schaltungsanordnung zur Spannungsversorgung eines Zweidrahtsensors
DE10325277A1 (de) * 2003-06-03 2005-01-13 Endress + Hauser Flowtec Ag, Reinach Variables Feldgerät für die Prozessautomatisierungstechnik
EP1594101A1 (de) * 2004-05-08 2005-11-09 Siemens Schweiz AG Verfahren und Stellteil zur Steuerung und/oder Überwachung von Funktionseinheiten mittels Speisesignalmodulation
DE102006055396A1 (de) * 2006-11-22 2008-05-29 Endress + Hauser Gmbh + Co. Kg Signaltrenneinheit für eine Zwei-Leiter-Prozessregelschleife
DE102008022286A1 (de) * 2008-04-28 2009-11-05 Lapp Engineering & Co. Slavekommunikationsgerät für ein Feldbussystem
DE102010003221A1 (de) 2010-03-24 2011-09-29 Balluff Gmbh Elektronisches Bauteil für eine Sensorvorrichtung, Sensorvorrichtung und Verfahren zum Konfigurieren einer Sensorvorrichtung

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FR2377611A1 (fr) * 1977-01-13 1978-08-11 Endress Hauser Gmbh Co Systeme de traitement de signaux de mesure
EP0101528A1 (en) * 1982-08-19 1984-02-29 Honeywell Inc. Improvements in 2-wire analog communication systems

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FR2377611A1 (fr) * 1977-01-13 1978-08-11 Endress Hauser Gmbh Co Systeme de traitement de signaux de mesure
EP0101528A1 (en) * 1982-08-19 1984-02-29 Honeywell Inc. Improvements in 2-wire analog communication systems

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PATENT ABSTRACTS OF JAPAN, Band 10, Nr. 113 (E-399)[2170], 26. April 1986; & JP-A-60 249 441 (YOKOKAWA HOKUSHIN DENKI K.K.) 10-12-1985 *

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0273506A1 (en) * 1986-12-16 1988-07-06 North American Philips Corporation Two lead bidirectional stepping motor control
EP0347034A2 (en) * 1988-06-17 1989-12-20 Hewlett-Packard Company Improved sensor
EP0347034A3 (en) * 1988-06-17 1990-11-28 Hewlett-Packard Company Improved sensor
DE3842484A1 (de) * 1988-12-16 1990-06-21 Bayerische Motoren Werke Ag Kommunikationseinrichtung fuer kraftfahrzeuge
EP0387601A1 (de) * 1989-03-16 1990-09-19 KNICK ELEKTRONISCHE MESSGERÄTE GMBH & CO. Signalübertragungssystem
EP0422663A3 (en) * 1989-10-13 1992-03-25 Hitachi, Ltd. Communicator for field instruments and method of supplying power to this communicator
US5995021A (en) * 1989-10-13 1999-11-30 Hitachi, Ltd. Communicator for field instruments and method for supplying power to this communicator
US6172615B1 (en) 1989-10-13 2001-01-09 Hitachi, Ltd. Communicator for field instruments and method of supplying power to this communicator
EP0422663A2 (en) * 1989-10-13 1991-04-17 Hitachi, Ltd. Communicator for field instruments and method of supplying power to this communicator
EP0591926A2 (en) * 1992-10-05 1994-04-13 Fisher Controls International, Inc. Communication system and method
EP0591926A3 (en) * 1992-10-05 1995-03-01 Fisher Controls Int Communication system and procedure.
US5451923A (en) * 1992-10-05 1995-09-19 Fisher Controls International, Inc. Communication system and method
US5684451A (en) * 1992-10-05 1997-11-04 Fisher Controls International, Inc. Communication system and method
US5742225A (en) * 1995-05-24 1998-04-21 Endress + Hauser Gmbh + Co. Arrangement for signal transmission between a transmitting station and a receiving station
EP0744724A1 (de) * 1995-05-24 1996-11-27 Endress + Hauser Gmbh + Co. Anordnung zur leitungsgebundenen Energieversorgung eines Signalgebers vom Singnalempfänger
US6272446B1 (en) 1995-12-22 2001-08-07 Bruel & Kjaer Sound & Vibration Measurement A/S System and a method for measuring a continuous signal
EP0870176B1 (en) * 1995-12-22 2003-03-19 Brüel & Kjaer Sound & Vibration Measurement A/S A system and a method for measuring a continuous signal
US6703943B1 (en) 1998-09-07 2004-03-09 Robert Lalla Assembly for signal transfer between a receiving station and a transmitting station as well as for power supply of the transmitting station
DE19905071A1 (de) * 1999-02-08 2000-08-10 Siemens Ag Meßumformer sowie Verfahren zur Diagnose der Versorgung eines Meßumformers
DE10034684A1 (de) * 2000-07-17 2002-01-31 Endress Hauser Gmbh Co Meßeinrichtung zur Messung einer Prozeßvariablen
US6512358B2 (en) 2000-07-17 2003-01-28 Endress + Hauser Gmbh + Co. Measuring device for measuring a process variable
CN108291928A (zh) * 2015-11-24 2018-07-17 菲尼克斯电气公司 感应式电流互感器
WO2022028701A1 (de) * 2020-08-06 2022-02-10 Vega Grieshaber Kg Elektronische vorrichtung
WO2022028722A1 (de) * 2020-08-06 2022-02-10 Vega Grieshaber Kg Elektronische vorrichtung

Also Published As

Publication number Publication date
WO1987007064A1 (en) 1987-11-19
DE3615463A1 (de) 1987-11-12
JPS63500831A (ja) 1988-03-24

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