Difference between DCS & PLC Systems
DCS stands for Distributed Control System and PLC stands for Programmable Logic Controller. Do you know the Difference between DCS and PLC Systems ? Difference between DCS & PLC Systems
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Control Systems Theory
BASICS OF TRIPS, INTERLOCKS, PERMISSIVES & SEQUENCES
This post provides information about basics of Trip, Interlock, Permissive and Sequences which are regularly used in instrumentation control systems like ESD, DCS, PLC etc. Trip: The term Trip refers to an action that
Boiler Three Element Controller Philosophy
A single element control system is one with just one control input, a two element control system is one with two control inputs, etc. A three-element boiler water level control
4–20 mA Process Control Loops
In electrical signalling an analog current loop is used where a device must be monitored or controlled remotely over a pair of conductors. Only one current level can be present
4-20mA Loop Power Supply Questions and Answers
Here we discuss about the general 4-20mA Loop Power Supply Questions and answers come across in industrial instrumentation. 4-20mA Loop Power Supply What is a 4mA to 20mA signal? The 4mA
Transmitters 4-20mA Current Failure Alarm Limits
4-20 mA instrumentation and controls usually support a signal range slightly below 4 mA and above 20 mA. For transmitters, current values below 4 mA and above 20 mA are
What is Loop Checking ?
The Loop checking is defined as pre-Commissioning activity which is initiated after installation of instruments in the field and carry out the instrument loop checks between installed field instrument and respective control
Basics of Loop Checks
The term “loop” can refer to the entire “control loop” from primary element (sensor) through the transmitter, and controller, to the valve positioner, and the final control element (valve). The
How a 4-20mA Transmitter Works ?
A sensor is an input device that provides a usable output in response to the input measurand. A sensor is also commonly called a sensing element, primary sensor, or primary detector.
4-20 mA Transmitter Wiring Types : 2-Wire, 3-Wire, 4-Wire
Transmitters are available with a wide variety of signal outputs. The 4-20mA analogue signal is by far the most commonly used in industrial applications. Several physical 4-20mA wiring options exist.