Device for diagnosing or determining operating conditions or environmental conditions of field device of process automation technology, comprises voltmeter unit, where effective loop current is determined over voltage drop

摘要

The device comprises a voltmeter unit. An actual loop current (I-S) is determined over a voltage drop at an internal measuring resistor (7). An input unit or an output unit (3) is provided at a field device (1). A regulating evaluation unit displays the actual determined loop current as an operating condition of the field device.