Four Wire Current Loop

4-wire Transmitters Current Loops

4-wire (“self-powered”) Transmitter current loops DC electric current signals may also be used to communicate process measurement information from transmitters

Two Out of Three Logic

Alarm and Trip Systems

Alarm and Trip Systems The purpose of an alarm system is to bring a malfunction to the attention of operators

Control Loop

What is a Control Loop ?

A control loop is a process management system designed to maintain a process variable at a desired set point. Each

Loop Splitter Theory of Operation

4-20 mA Loop Splitter

4-20 mA Loop Splitter Problems with Current Loop Loads in Series Not so good:  A single 4-20 mA loop from

PID Controller Functionality

PID Controller Loop Tuning Tips

PID CONTROLLER TUNING If the controller is withdrawn from the control panel face, further adjustments are available which are used to