EP 0817149 B1 19990512 - Circuit for transmitting a measurement current from an intrinsically safe sensor to a non-intrinsical area
Title (en)
Circuit for transmitting a measurement current from an intrinsically safe sensor to a non-intrinsical area
Title (de)
Schaltung zur Übertragung eines Messstroms von einem eigensicheren Sensor in einen nicht-eigensicheren Bereich
Title (fr)
Circuit transférant un courant de mesure d'un capteur de sécurité intrinsèque dans une zone de sécurité non-intrinsèque
Publication
Application
Priority
- EP 97109825 A 19970617
- EP 96110541 A 19960628
Abstract (en)
[origin: EP0817149A1] The sensor Ä1Ü is located in an intrinsically safe region Ä10Ü and is connected with a current measuring resistor in a non-intrinsically safe region Ä20Ü. The sensor output is in the 4-20 mA range, and is supplied from the secondary of a transformer Ä2Ü via a rectifier unit Ä8Ü and a conditioning stage Ä9Ü. The transformer has a primary with two windings Ä21,22Ü which are coupled to an output stage arrangement Ä31Ü, in which the current measuring resistor connected to the centre tap of the transformer primary. The voltage developed across the resistor is fed to an offset unit, and subsequently to a voltage to current converter (7),
IPC 1-7
IPC 8 full level
G08C 19/02 (2006.01)
CPC (source: EP US)
G08C 19/02 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0817149 A1 19980107; EP 0817149 B1 19990512; AT E180085 T1 19990515; CA 2209208 A1 19971228; CA 2209208 C 20000912; DE 59700161 D1 19990617; DK 0817149 T3 19991115; ES 2134046 T3 19990916; US 5907292 A 19990525
DOCDB simple family (application)
EP 97109825 A 19970617; AT 97109825 T 19970617; CA 2209208 A 19970626; DE 59700161 T 19970617; DK 97109825 T 19970617; ES 97109825 T 19970617; US 88351897 A 19970626