Rosemount Inc.

Robert Ernest LaRoche

George Charles Hausler

Mark Fandrey

Steven John McCoy

Clarence Edward Holmstadt

Steven J Mccoy

A process transmitter includes device circuitry that generates values that are to be conveyed on a current loop. A series control transistor is in series between the current loop and the device circuitry and a saturation prevention circuit prevents the series control transistor from entering saturation.

Saturation-controlled loop current regulator

An environmentally sealed service block is mounted inside a field wiring compartment of a process fluid transmitter. The service block has field wiring terminals, sealed jumper assemblies and sealed pushbutton switches connected to a sealed cable and plug. The sealed plug plugs into a permanently sealed transmitter assembly. High impedance programming circuitry connected to the jumper assemblies and pushbutton switches is completely sealed and not subject to malfunction due to contamination present in the field wiring compartment.

Growing community of inventors

Shakopee, MN, United States of America

Robert Ernest LaRoche