Through air radar level transmitter with galvanic isolation

A two-wire transmitter comprising:

• a dual compartment housing defining a wiring compartment and a control compartment;
• a control system in the control compartment including a signal processing circuit measuring a process variable and developing a measurement signal representing the process variable;
• and
• a two-wire circuit and a power supply in the wiring compartment, the two-wire circuit for connection to a remote power source using a two-wire process loop, for controlling current on the loop in accordance with the measurement signal, the power supply being connected to the two-wire circuit and the control system to isolate the two-wire circuit from the control system, for receiving power from the two-wire process loop and supplying power to the control system, wherein the power supply comprises a voltage regulator receiving loop power and developing a regulated output voltage, a current switching circuit receiving the regulated output voltage and driving a primary of a transformer, with a secondary of the transformer coupled to the control system, and a voltage shift control circuit including an isolator circuit driven by the control system for controlling voltage supplied by the voltage regulator.