Rosemount Inc.

Jonathon Michael Jongsma

Garrie David Huisenga

James A Johnson

A process field device for coupling to a two wire process control loop includes a field device circuitry and a switching regulator to power the circuitry. A series regulator provides a regulated supply voltage to the switching regulator. A noise filter reduces the amount of noise from the switching regulator which enters the two wire process control loop.

Process device with switching power supply

A circuit includes a multiplexer, an analog-to-digital converter, and a processor that compares a sequence of digital outputs from the analog-to-digital converter to a sequence of normal ranges that correspond with the digital outputs in order to provide an error output when one of the digital outputs is outside its normal range.

Growing community of inventors

Minneapolis, MN, United States of America

Jonathon Michael Jongsma