Instrumentation Tutorials | Instrumentation Study Material | PLC

What is Keyphasor ? How does Keyphasor works ?

S Bharadwaj ReddyJanuary 22, 2019January 22, 2019

Keyphasor is a Trademark owned by the Bentley Nevada Company. The system includes a proximity probe, extension cable and proximitor sensor. Convention recommends that the prime keyphasor event is located

Proximity Transducer System Operation

S Bharadwaj ReddyJanuary 21, 2019January 22, 2019

Proximity Transducer System provides an output voltage directly proportional to the distance between the probe tip and the observed conductive surface. It is capable of both static (position) and dynamic (vibration) measurements, and

Objective Questions on Valves

S Bharadwaj ReddyJanuary 20, 2019January 20, 2019

List of Objective Questions on Valves, Valves Test Questions and Online Quiz on Control Valves. Test Your skills on Control Valves. Objective Questions on Valves Valves Objective Questions 1. Valves are defined

What is Process Override Switch (POS) ?

S Bharadwaj ReddyJanuary 19, 2019January 21, 2019

Process Override Switch shall be provided to override unhealthy field inputs in order to facilitate start-up, which shall automatically be released upon normalisation of the field input or preset time,

What is Maintenance Override Switch (MOS) ?

S Bharadwaj ReddyJanuary 19, 2019January 21, 2019

Maintenance Override Switch (MOS) shall be provided to override all field inputs designated to trip the facility in order to facilitate maintenance of field devices without interrupting the plant operation.

Foundation Fieldbus Split Range Valves

S Bharadwaj ReddyJanuary 18, 2019

In FOUNDATION Fieldbus systems (Note1), where a special software function block called “SPLT” exists to provide split-ranged sequencing to two valves. The “SPLT” function block takes in a single control

Emergency Shutdown System Philosophy

S Bharadwaj ReddyJanuary 17, 2019January 19, 2019

The Emergency Shutdown System (ESD) is designed to protect the personnel, plant, equipment and the environment against pollution. The purpose of the ESD system is to monitor process safety parameters

How to Read Circular Chart Recorder for Flow Measurement

S Bharadwaj ReddyJanuary 16, 2019January 17, 2019

Flow Transmitter output in square-root value and chart recorder prints flow value in range 0 to 100%. How to read circular chart recorder ? The simplified formula for the gas flow,

PLC Ladder Logic for Start-up Control of Boilers

S Bharadwaj ReddyJanuary 13, 2019January 14, 2019

The start-up control for the boilers is enabled via a master thermostat. PLC control is to be used to ensure that 4 gas boilers do not start up simultaneously in

Difference between Fieldbus, Profibus and HART Protocols

S Bharadwaj ReddyJanuary 12, 2019January 22, 2019

The method of representing, encoding, and transmitting the data is called the protocol. At the field level, the dominant protocols for process instruments are HART, FOUNDATION Fieldbus H1 and PROFIBUS