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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Control Valve

Control Valve Passing Even When Fully Closed: Causes, Symptoms, Troubleshooting and Solutions

Table of ContentsUnderstanding Control Valve Passing and Why It HappensWhat Does It Mean When a Control Valve Is Passing?How a Control Valve Should Close Under Normal ConditionsCommon Symptoms of a Passing Control ValveMajor Causes of Control Valve PassingControl Valve Shutoff Performance by Valve TypeHow...
Instrumentation Calculators

Instrument Range Calculator | Calculate Span, Rangeability, Turndown Ratio & Calibration Range

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Instrumentation Tools

HVAC Fan Static Pressure Calculator – Accurate Airflow Resistance Estimator for Fan Sizing

Table of ContentsWhat is Fan Static Pressure in HVAC?What does the HVAC Fan Static...
Instrumentation Questions

Temperature Transmitter Troubleshooting Quiz – Advanced Diagnostics for Industrial Applications

Introduction to Temperature Transmitter Challenges Get a good look at how to fix temperature transmitters...
Engineering

Difference Between Intrinsically Safe (IS) and Non-IS Cables

Table of ContentsWhat is an Intrinsically Safe (IS) Cable?Why Intrinsically Safe Cables are used...
Engineering

Checklist for Installation of Local Instruments – Complete Guide for EPC, QA/QC and Commissioning Engineers

Table of ContentsWhy use a Local Instrument Installation Checklist?25+ Point Local Instrument Installation Checklist...
Flow Measurement

Magnetic Flowmeter vs. Turbine Flowmeter – Complete 2025 Comparison Guide

Table of ContentsOverview: Magnetic Flowmeter (Magmeter) & Turbine FlowmeterMagnetic Flowmeter vs Turbine Flowmeter -...
Instrumentation Tools

Fire Alarm Battery Size Calculator – Professional Tool for Accurate Backup Power Sizing

Table of ContentsWhat is a Fire Alarm Battery?Why Backup Power is Critical in Fire...
Instrumentation Questions

DCS Cascade Control Loop Instrumentation Quiz – 25 Expert-Level Questions

The DCS Cascade Control Loop Instrumentation Quiz is intended for professionals with extensive experience...
PLC

PLC Program for Motor Starter with Low-Level Switch Interlock

Table of ContentsWhy Motor Starters Need ProtectionImportance of Low-Level Interlock in Pump ApplicationsField Layout...
Field Instrumentation

Why 24VDC is Not Always 24VDC – Real-World Troubleshooting for Analog and Digital Signals

Table of ContentsTop 10 Field-Proven Causes Behind 24VDC FailuresCause 1. The Illusion of No-Load...
Checklist

25-Point  Instrumentation Junction Box (JB) Wiring and Termination Checklist for EPC Engineers

Table of ContentsWhat is an Instrumentation JB?25-Point  Instrumentation Junction Box (JB) Wiring and Termination...
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....
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Latest articles

Control Valve

Control Valve Passing Even When Fully Closed: Causes, Symptoms, Troubleshooting and Solutions

Table of ContentsUnderstanding Control Valve Passing and Why It HappensWhat Does It Mean When...
Instrumentation Calculators

Instrument Range Calculator | Calculate Span, Rangeability, Turndown Ratio & Calibration Range

<!-- Google Fonts (safe to keep as a inside a WordPress "Custom HTML"...
Communication

Profibus PA Communication Problems: Causes, Symptoms and Troubleshooting Guide

Table of ContentsOverview of Profibus PA Communication Challenges What is Profibus PA Communication?Definition of Profibus...
Engineering

FAT vs SAT vs SIT: Three Critical Tests That Determine Whether Your Plant Is Truly Ready for Startup

Table of ContentsIntroductionPurpose of Factory Acceptance TestingFactory Acceptance Test ObjectivesFactory Acceptance Test ObjectivesPLC FAT...