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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
Basic Guide lines to be followed during DCS Loop Checks (Follow P&ID and Instrument Index): 1. Location of the instrument Tag no. to be checked (As per P&ID) 2. Tag

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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