FIELD: physics.
SUBSTANCE: field device has field device circuits configured to measure or control a process parameter; a first terminal clamp for the process control circuit configured to connect to a two-wire process control circuit. The two-wire process control circuit carries loop current; a second terminal clamp for the process control circuit configured to connect to the two-wire process control circuit; a pulse stabiliser having an input and an output. The output is connected to field device circuits and can power the field device circuits; and an ac voltage controller, having an input which is electrically connected to the first terminal clamp of the process control circuit, and a voltage output which is connected to the input of the pulse stabiliser, and a control input. The field device is configured such that voltage at the voltage output is a function of the control input.
EFFECT: broader functional capabilities of a field device owing to possibility of its operation at high power.
13 cl, 7 dwg
