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Basics of Trips, Interlocks, Permissives & Sequences

S Bharadwaj Reddy
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...

Transmitters 4-20mA Current Failure Alarm Limits

S Bharadwaj Reddy
4-20 mA instrumentation and controls usually support a signal range slightly below 4 mA and above 20 mA. For transmitters, current values below 4 mA and above 20 mA are...

Vibrating Tube Densitometers Working Principle

S Bharadwaj Reddy
One of the many parameters that must be accurately measured for product quality control, custody transfer, process control, or liquid interface detection purposes is liquid density. Often density measurement is...

Troubleshooting a 4-20mA Current loop

S Bharadwaj Reddy
The basic layout of every 4-20mA loop consists of a power supply, a transmitter, and passive loop devices. The supply produces the energy to run the loop. The transmitter controls...

How to Do Loop Checks During Plant Pre-Commissioning

S Bharadwaj Reddy
Guide lines to be followed in Field during DCS Field Loop Checks (with P&ID) and step by step procedure to be followed during DCS Loop Checks....

How to Do Logic Checks During Plant Pre-Commissioning

S Bharadwaj Reddy
Basic Guidelines to be followed during Logic Checks (Follow Cause & Effect, Control Narrative, P&ID and Latest Alarm & Trip Schedule): 1. Understand the Cause & Effect Matrix, if any...

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