EP0817149B1 - Schaltung zur Übertragung eines Messstroms von einem eigensicheren Sensor in einen nicht-eigensicheren Bereich - Google Patents
Schaltung zur Übertragung eines Messstroms von einem eigensicheren Sensor in einen nicht-eigensicheren Bereich Download PDFInfo
- Publication number
- EP0817149B1 EP0817149B1 EP97109825A EP97109825A EP0817149B1 EP 0817149 B1 EP0817149 B1 EP 0817149B1 EP 97109825 A EP97109825 A EP 97109825A EP 97109825 A EP97109825 A EP 97109825A EP 0817149 B1 EP0817149 B1 EP 0817149B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- intrinsically safe
- current
- circuit
- safe area
- transformer
- 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
Links
Images
Classifications
-
- 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 a circuit arrangement for Transmission of a measuring current from an intrinsically safe Sensor arrangement in a non-intrinsically safe area by means of a current measuring resistor located therein.
- sensors electrical signals that the sensors due to a generate physical or chemical law, in a measuring current corresponding to the measuring range of a sensor formed from 4 mA to 20 mA.
- the sensor is through one provided for this purpose and structurally combined with the sensor Forming stage expands and forms a sensor arrangement.
- DE-A 35 26 997 is a circuit arrangement described for the transmission of a in a first Circuit generated measuring current from 0 mA to 20 mA in one second circuit by means of a transformer, which to one of the energy supply of the first circuit used and lying on its side DC converter belongs, with the transformer on the side of the second circuit two in series has switched partial windings on the Connection point a first pole of an energy source and on their connections facing away from the connection point second pole of the energy source.
- DE-A 38 12 861 Circuit arrangement for the intrinsically safe power supply of a non-intrinsically safe area using an in DC converter located in this area to which a push-pull transformer belongs the one facing the non-intrinsically safe area Primary winding with two of the same, in opposite directions in series switched partial windings and one intrinsically safe Area facing secondary winding with two identical, has partial windings connected in opposite directions in series.
- FIG. 1 In the block diagram of the figure is a circuit arrangement for transmitting one from a sensor arrangement 1 with a Sensor 11 emitted measuring current I via a transformer 2 shown.
- the conditions for an intrinsically safe Range are e.g. in the European standards EN 50014 to EN 50039 defined.
- the offset setting level 6 receives a corresponding one Setting signal 61 supplied and mainly serves Correction or compensation of idle losses of the Transformer 2, the current measuring resistor 5 as Idle current along with one from the secondary side of the Transformer 2 ago transmitted, the measuring current I flow through proportional current. So this is the most Measuring resistor 5 falling voltage not proportional to Measuring current I.
- the offset setting stage 6 is preferred realized by means of an operational amplifier, the Degree of gain adjustable by means of a potentiometer is made.
- the secondary side of the transformer 2 feeds one Rectifier and smoothing stage 8 and this in turn an intrinsic safety conditioning level 9.
- an intrinsic safety conditioning level 9 contains those components that correspond to the mentioned standards the prescribed voltage and Allow maximum current values to be observed. These components are in particular longitudinal resistances in each of the feed lines Sensor arrangement 1 and connected in parallel to this Protective diodes, e.g. Zener diodes.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Description
- ein erstes Ende des Strom-Meßwiderstands an einem Schaltungsnullpunkt und ein zweites Ende des Strom-Meßwiderstands an einem Mittenabgriff einer Ausgangsstufe des Gleichspannungswandlers liegt, die mit den Teilwicklungen der Primärwicklung verbunden ist,
- der Mittenabgriff am Eingang einer Offset-Einstellstufe angeschlossen ist,
- der Ausgang der Offset-Einstellstufe mit dem Eingang eines Spannungs-Strom-Wandlers verbunden ist und
- ein erster Pol einer Energiequelle am Verbindungspunkt der Teilwicklungen und ein zweiter Pol der Energiequelle am Schaltungsnullpunkt liegt.
Claims (1)
- Schaltungsanordnung zur Übertragung eines von einer Sensoranordnung (1) an einer in einem eigensicheren Bereich (10) liegenden Meßstelle abgegebenen Meßstroms (I) über einen Transformator (2) zu einem nicht-eigensicheren Bereich (20) mittels eines in diesem liegenden Strom-Meßwiderstands (5) bei gleichzeitiger Energieversorgung der Sensoranordnung mittels eines Gleichspannungswandlers (3), zu dem der Transformator gehört, der eine dem nichteigensicheren Bereich zugewandte Primärwicklung mit zwei gleichen, gleichsinnig in Serie geschalteten Teilwicklungen (21, 22) und eine einzige, dem eigensicheren Bereich zugewandte Sekundärwicklung (23) aufweist, bei welcher Schaltungsanordnungein erstes Ende des Strom-Meßwiderstands (5) an einem Schaltungsnullpunkt (SN) und ein zweites Ende des Strom-Meßwiderstands an einem Mittenabgriff einer Ausgangsstufe (31) des Gleichspannungswandlers (3) liegt, die mit den Teilwicklungen (21,22) der Primärwicklung verbunden ist,der Mittenabgriff am Eingang einer Offset-Einstellstufe (6) angeschlossen ist,der Ausgang der Offset-Einstellstufe mit dem Eingang eines Spannungs-Strom-Wandlers (7) verbunden ist undein erster Pol einer Energiequelle (4) am Verbindungspunkt der Teilwicklungen (21, 22) und ein zweiter Pol der Energiequelle am Schaltungsnullpunkt liegt.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97109825A EP0817149B1 (de) | 1996-06-28 | 1997-06-17 | Schaltung zur Übertragung eines Messstroms von einem eigensicheren Sensor in einen nicht-eigensicheren Bereich |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96110541 | 1996-06-28 | ||
EP96110541 | 1996-06-28 | ||
EP97109825A EP0817149B1 (de) | 1996-06-28 | 1997-06-17 | Schaltung zur Übertragung eines Messstroms von einem eigensicheren Sensor in einen nicht-eigensicheren Bereich |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0817149A1 EP0817149A1 (de) | 1998-01-07 |
EP0817149B1 true EP0817149B1 (de) | 1999-05-12 |
Family
ID=8222956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97109825A Expired - Lifetime EP0817149B1 (de) | 1996-06-28 | 1997-06-17 | Schaltung zur Übertragung eines Messstroms von einem eigensicheren Sensor in einen nicht-eigensicheren Bereich |
Country Status (7)
Country | Link |
---|---|
US (1) | US5907292A (de) |
EP (1) | EP0817149B1 (de) |
AT (1) | ATE180085T1 (de) |
CA (1) | CA2209208C (de) |
DE (1) | DE59700161D1 (de) |
DK (1) | DK0817149T3 (de) |
ES (1) | ES2134046T3 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6141194A (en) * | 1998-09-22 | 2000-10-31 | Simmonds Precision Products, Inc. | Aircraft fuel tank protective barrier and method |
CA2277686A1 (en) * | 1999-07-14 | 2001-01-14 | Milltronics Ltd. | An intrinsically safe universal switching power supply |
EP1296128A1 (de) * | 2001-09-21 | 2003-03-26 | Endress + Hauser Flowtec AG | Viskositäts-Messgerät |
DE50214072D1 (de) * | 2001-06-19 | 2010-01-21 | Flowtec Ag | Viskositäts-messgerät |
US6970100B2 (en) * | 2001-07-05 | 2005-11-29 | Long Range Systems, Inc. | Temperature tag and system for monitoring, recording, and reporting temperature readings |
DE10253603A1 (de) * | 2002-11-15 | 2004-06-03 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Verfahren zum Erzeugen von Softwaremodulen für Feldgeräte der Prozessautomatisierungstechnik |
DE10255741A1 (de) * | 2002-11-28 | 2004-06-09 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Modularer Messumformer mit galvanisch getrennten Messfühler |
DE102006009506B4 (de) * | 2006-02-27 | 2010-09-23 | Phoenix Contact Gmbh & Co. Kg | Bidirektionaler, galvanisch getrennter Übertragungskanal |
DE102014112452B4 (de) * | 2014-08-29 | 2022-03-31 | Endress + Hauser Flowtec Ag | Explosionsschutzschaltung mit Impedanzanpassung |
AT516903B1 (de) * | 2015-03-09 | 2020-10-15 | Fronius Int Gmbh | Schaltungsanordnung mit Transformator mit Mittelpunktanzapfung und Messung der Ausgangsspannung |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3764880A (en) * | 1972-05-08 | 1973-10-09 | Rosemount Inc | Two-wire current transmitter with isolated transducer circuit |
DE2701184A1 (de) * | 1977-01-13 | 1978-07-27 | Endress Hauser Gmbh Co | Schaltungsanordnung zur uebertragung von messwertsignalen |
CH620537A5 (en) * | 1977-03-03 | 1980-11-28 | Bauer Messinstrumente Ag | Device for reducing losses and thus for improving the transfer characteristic at a measurement-value transformer |
US4532510A (en) * | 1982-06-24 | 1985-07-30 | Sereg, S.A. | Measuring apparatus having a sensor located remotely from its electricity power supply |
DE3526997A1 (de) * | 1984-07-28 | 1986-02-06 | Knick Elektronische Meßgeräte GmbH & Co, 1000 Berlin | Gleichstrom-uebertragungsschaltung |
US4725839A (en) * | 1984-12-21 | 1988-02-16 | Ferranti Subsea Systems, Ltd. | Remote, inductively coupled, transducer interface |
DE3812861A1 (de) * | 1988-04-18 | 1989-10-26 | Siemens Ag | Eigensichere stromversorgungseinrichtung |
-
1997
- 1997-06-17 DE DE59700161T patent/DE59700161D1/de not_active Expired - Lifetime
- 1997-06-17 ES ES97109825T patent/ES2134046T3/es not_active Expired - Lifetime
- 1997-06-17 DK DK97109825T patent/DK0817149T3/da active
- 1997-06-17 EP EP97109825A patent/EP0817149B1/de not_active Expired - Lifetime
- 1997-06-17 AT AT97109825T patent/ATE180085T1/de not_active IP Right Cessation
- 1997-06-26 US US08/883,518 patent/US5907292A/en not_active Expired - Lifetime
- 1997-06-26 CA CA002209208A patent/CA2209208C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
ES2134046T3 (es) | 1999-09-16 |
DK0817149T3 (da) | 1999-11-15 |
US5907292A (en) | 1999-05-25 |
EP0817149A1 (de) | 1998-01-07 |
ATE180085T1 (de) | 1999-05-15 |
CA2209208C (en) | 2000-09-12 |
DE59700161D1 (de) | 1999-06-17 |
CA2209208A1 (en) | 1997-12-28 |
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