Patent ID: 11913976
Assignee: ENDRESS+HAUSER WETZER GMBH+CO. KG
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A field device for measuring a process variable, comprising:
a sensor designed to measure the process variable;
an interface having at least four electrical contacts;
a first electrical current regulator designed to set a first electrical current between a first contact of the at least four electrical contacts and a second contact of the at least four electrical contacts when the field device is contacted via the interface such that a first voltage source is connected across the first and the second contacts;
a second electrical current regulator designed to set a second electrical current between the first contact and a third contact of the at least four electrical contacts when the field device is contacted via the interface such that a second electrical voltage source is connected across the first and the third contacts and to generate a second signal; and
a control unit designed to:
transmit the measured process variable according to a predefined digital standard via a fourth contact of the at least four electrical contacts when the second electrical current is settable between the first contact and the third contact, and
control the first electrical current regulator such that the electrical current level of the first electrical current corresponds to the measured process variable according to a predefined electrical current signal standard when the second electrical current regulator generates the second signal.