Patent ID: 6972584

Claim:
A level measurement device for coupling to a remote receiver through a two-conductor loop carrying a current signal, the two-conductor loop providing a signal path for the level measurement system to transmit process variable data to the remote receiver, said level measurement device comprising: a process variable measurement stage comprising, a transducer for emitting energy pulses and coupling reflected energy pulses; a controller having a receiver stage and a transmitter stage; said transducer being operatively coupled to said transmitter stage and being responsive to said transmitter stage for emitting said energy pulses, and said receiver stage being operatively coupled to said transducer for receiving reflected energy pulses coupled by said transducer, and said controller including a component for processing said receiver output and generating measurement data; a current regulator, said current regulator being coupled to the current loop, and having an input port coupled to said controller for receiving a control signal to regulate the current signal in the current loop, said current signal being proportional to said measurement data; a power decoupling module, said power decoupling module comprising a converter, said converter having an input coupled to the output of said current regulator and an output, and said power decoupling module including a control circuit for generating a control signal; a storage component, said storage component being coupled to the output of said converter for receiving a charging current derived from the current loop; said converter being responsive to said control signal for varying the current derived from the current loop for charging said storage component.