HomeAuthorsPosts by Sundareswaran Iyalunaidu

Sundareswaran Iyalunaidu

With over 24 years of dedicated experience, I am a seasoned professional specializing in the commissioning, maintenance, and installation of Electrical, Instrumentation and Control systems. My expertise extends across a spectrum of industries, including Power stations, Oil and Gas, Aluminium, Utilities, Steel and Continuous process industries. Tweet me @sundareshinfohe
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Procedures

Hydraulic System Pressure Switch Troubleshooting: Step by Step Safe Procedure

Table of ContentsWhat Is a Hydraulic Pressure Switch and How Does It Work?Hydraulic Pressure Switch Operating PrinciplePressure Switch Hysteresis. Set Point and Reset PointNormally Open and Normally Closed Pressure Switch ContactsHydraulic Pressure Switch vs Pressure TransmitterCommon Hydraulic Pressure Switch Problems and SymptomsPressure Switch Not...
Instrumentation Questions

Advanced PLC Interlock Troubleshooting Quiz for Process Industries | 25 Practical PLC Diagnostics Questions for Instrumentation and Automation Engineers

Why PLC Interlock Troubleshooting Matters in Modern Process Industries  Modern process industries depend on reliable PLC interlock systems to protect personnel, equipment, and production. Troubleshooting PLC interlocks requires strong knowledge of process control, field instrumentation, PLC diagnostics, permissive logic, shutdown sequences, and industrial automation practices....
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Instrumentation Calculators

HVAC Circular Duct Size Calculator – Accurate Airflow and Diameter Sizing Tool

One of the most important things for an HVAC system to work well is...
Instrumentation Questions

Advanced Quiz on Control System Standards (IEC, ISA, ANSI) for Process Industries

Standards for control systems make ensuring that process industries are safe, consistent, and efficient....
Engineering

Level Transmitter Selection Checklist for EPC Engineers – Step-by-Step Guide

Table of ContentsHow to choose a level transmitter?Step 1: Evaluate the Process MediumStep 2:...
Documentation

PLC System Documentation Guide: Essential Records for Industrial Automation

Table of ContentsWhat is PLC System Documentation?Why is PLC Documentation Important?Key Components of PLC...
P&ID

11 Best P&ID Software Tools for Process Design Engineers in 2025

Table of ContentsBest P&ID Software Tools for Process Engineers in 20251. AutoCAD P&ID (Autodesk)2....
Instrumentation Calculators

Mean Time To Failure (MTTF) Calculator for Instrumentation Reliability Assessment

This Mean Time To Failure (MTTF) Calculator is a powerful tool for instrumentation engineers,...
Instrumentation Questions

Radiometric Level Measurement: 25 MCQs for Engineers & Technicians

This assessment will test your knowledge of radiometric level systems, including how to fix...
Temperature Measurement

Why Install Thermowells at a 45° Angle? Engineering Logic Explained

Table of ContentsWhat is a Thermowell?Why Install a Thermowell at a 45° Angle?Importance of...
PLC

Hot Standby in PLC Systems: Architecture, Working, and Benefits

Table of ContentsWhat is Hot Standby in PLC?Need for Redundancy in PLC SystemsVisualizing Hot...
How to

How to Read a Datasheet of a Temperature Transmitter ?

Table of ContentsPractical Guide using Rosemount 3144P as a Case StudyHow to read the...
Instrumentation Calculators

Online PT1000 RTD Calculator – Convert Resistance (Ω) to Temperature (°C) Instantly

A Resistance Temperature Detector (RTD) is a very accurate temperature sensor that works by...
Instrumentation Questions

Process Instrument Calibration MCQ Challenge – NIST, ISO 17025, ISA Standards & Calculations

In industrial settings, mastering process instrumentation calibration is very important for making sure that...
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Procedures

Hydraulic System Pressure Switch Troubleshooting: Step by Step Safe Procedure

Table of ContentsWhat Is a Hydraulic Pressure Switch and How Does It Work?Hydraulic Pressure...
Instrumentation Questions

Advanced PLC Interlock Troubleshooting Quiz for Process Industries | 25 Practical PLC Diagnostics Questions for Instrumentation and Automation Engineers

Why PLC Interlock Troubleshooting Matters in Modern Process Industries  Modern process industries depend on reliable...
Instrumentation Calculators

Capacitance Level Sensor Calculator: Calculate Liquid Level and Capacitance for Instrumentation Applications

Capacitance Level Sensor Calculator :root{ --bg:#F2F5F3; --panel:#FFFFFF; ...
SIS/ESD

How are ESD Signals Selected? Complete ESD Signal Selection Guide

Table of ContentsWhat Is an ESD Signal in an Emergency Shutdown System?Why Is ESD...