Feedback Control Principle
Before we begin our discussion on process control, we must define a few key terms. First, we have what is
Control Systems
We have the largest collection of Industrial Control Systems articles like industrial automation, Distributed Control Systems (DCS).
What is a Active Barrier ?
An active barrier uses transformers, optoisolators or relays to provide isolation between the hazardous area and the non-hazardous area. It
Zener Diode Barrier Principle
The zener diode barrier works by diverting potentially dangerous energy to ground before it can reach the hazardous area. Zener
Two out of Three Logic Analogy
Two out of Three Logic with Boolean Algebra Analysis : In designing digital circuits, the designer often begins with a
Overview of Woodward Governor 505
Governor is a device which senses the speed of an engine or turbine and controls the fuel (or steam) to
Troubleshooting with Loop Calibrator
Special-purpose electronic test instruments called loop calibrators exist for the express purpose of 4-20 mA current loop circuit troubleshooting. These
Troubleshooting Current Loops with Voltage Measurement
Sometimes ammeter or current measurement with multimeter is unavailable at work locations , we can still perform useful troubleshooting measurements
4-wire Passive versus Active Transmitters
4-wire “passive” versus “active” output transmitters Some self-powered (4-wire) analog electronic transmitters are designed to behave as electrical loads rather
2-wire Transmitters Current Loops
2-wire (“loop-powered”) transmitter current loops It is possible to convey electrical power and communicate analog information over the same two
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