PLC based 4 Way Traffic Light Control System
We most often come across four way traffic jam in our city. This PLC ladder logic gives the solution to control city traffic using programmable logic control. 4 Way Traffic…
Instrument Mechanic Interview Questions
Read the following list of frequently asked Instrument Mechanic Interview Questions and answers for preparing your face to face interview. Instrument Mechanic Questions Explain about Venturi Meter ? It is…
Magnetic Level Gauge Float Design
Magnetic level gauge work on the principle of communicating vessels, therefore the level in the measuring chamber will be the same as the level in the vessel. The measuring chamber…
SWAS Analyzers Questions and Answers
Steam and water analysis system (SWAS) is a system dedicated to the analysis of steam or water. In power stations, it is usually used to analyze boiler steam and water…
DeMorgan’s Theorems using Ladder Diagram
DeMorgan theorem is used in digital electronics. Explain the De Morgan theorem using PLC ladder language. DeMorgan’s Theorems are two additional simplification techniques that can be used to simplify Boolean…
Instrumentation documents
Different types of instrumentation documents are loop diagrams, functional diagrams, piping and instrumentation diagrams.
When to use a Diaphragm Seal?
Process measurement sensors are not indestructible. Not even the most rugged device is fully immune to the chemical nature of process media or the kinetic impact associated with fluid composition…
Process Control Loop Testing
A very useful technique for testing process control loop response is to subject it to a “step-change” in controller output. In other words, the process is perturbed (the highly technical…
Identify Level Control Loop Tuning Problems
A level control loop is supposed to maintain a constant level of liquid at the bottom of the stripping tower where considerable amount of vibration exists, but it seems to have…
PLC Permissive for Motor Control
A engineer needs to write a PLC program to control a water pump driven by an electric motor. This water pump will be manually started and stopped by pushbutton switches,…
