Disadvantages of Resistance Temperature Detectors
Resistance Temperature Detectors (RTDs), are sensors used to measure temperature. Many RTD elements consist of a length of fine wire wrapped around a ceramic or glass core but other constructions…
PLC Practice Questions
Explain what the following PLC Practice Questions on “ladder-logic” circuit does, and identify the meaning of each symbol in the diagram: PLC Practice Questions Explain why the TSH uses a normally-open contact…
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…
