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…
Coriolis Mass Flow Meter as a Multi-Variable Transmitter
Ability to simultaneously measure 3 process variables (mass flow rate, temperature, and density) makes Coriolis flowmeter a versatile instrument indeed.
Turbine Flow Meter Installation Procedure
Turbine Flow Meter installed with respect to the arrow pointing in the direction of fluid flow. Learn the installation procedure.
Hazardous Area Classification Questions
Hazardous Area Classification Questions What is a hazardous area? A hazardous area classification is one in which concentrations of flammable substances are present or can be expected to be present.…
Important Factors for Thermocouple Selection
It would be difficult to chart a career course in the industrial process control field without being exposed to thermocouples. They are the ubiquitous basic temperature measuring tools with which…
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…
Guided-wave Radar Level Measurement Animation
The following animation shows how a radio-energy pulse travels down and then up the wave guide of a guided-wave radar level instrument, relating the peaks on an echo curve to…
What is Relay Logic ?
Relay logic is a method of implementing combinational logic in electrical control circuits by using several electrical relays wired in a particular configuration. Relay Logic The schematic diagrams for relay logic…
