Field device for providing a sensor unit with energy from a network

A field device configured for providing a sensor unit with energy from a 2-wire network, the field device comprising:

• a first input terminal configured for being connected to a first wire of the network;
• a second input terminal configured for being connected to a second wire of the network;
• a first output terminal configured for being connected to a first wire of the sensor unit;
• a second output terminal configured for being connected to a second wire of the sensor unit;
• a rectifier unit having a first part arranged between the first input terminal and a first node, and a second part is arranged between the second input terminal and a second node, wherein the first node is connected to the first output terminal;
• a current measurement device arranged between the second node and a third node, the current measurement device configured for measuring a measured current between the second node and the third node;
• a voltage measurement device configured for measuring a measured voltage between the first node and the second node;
• a first semiconductor arranged between the first node and the third node, the first semiconductor configured for passing a bypass current through the first semiconductor, wherein the measured current, which is a sum of the bypass current and a load current through the sensor unit, comprises a two-part curve, with a negative linear current-voltage-correlation in a lower voltage-section and a constant current in an upper voltage-section;
• and
• a second semiconductor arranged between the third node and the second output terminal.