Basics of Instrumentation | Electrical Basics

BASICS OF TRIPS, INTERLOCKS, PERMISSIVES & SEQUENCES

S Bharadwaj ReddyMarch 15, 2019March 15, 2019

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 ReddyFebruary 25, 2019March 21, 2019

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

Basics of Loop Checks

S Bharadwaj ReddyFebruary 23, 2019March 21, 2019

The term “loop” can refer to the entire “control loop” from primary element (sensor) through the transmitter, and controller, to the valve positioner, and the final control element (valve). The

How a 4-20mA Transmitter Works ?

S Bharadwaj ReddyFebruary 22, 2019March 21, 2019

A sensor is an input device that provides a usable output in response to the input measurand. A sensor is also commonly called a sensing element, primary sensor, or primary detector.

4-20 mA Transmitter Wiring Types : 2-Wire, 3-Wire, 4-Wire

S Bharadwaj ReddyFebruary 22, 2019March 21, 2019

Transmitters are available with a wide variety of signal outputs. The 4-20mA analogue signal is by far the most commonly used in industrial applications. Several physical 4-20mA wiring options exist.

Loop Check of 4-20mA or HART Transmitters

S Bharadwaj ReddyFebruary 22, 2019April 10, 2019

Do you know about Loop Check of 4-20mA or HART Transmitters or Instruments Loop check procedure ? This article provides the basic info about loop checks of field instruments. Loop Check

Sink or Source? Normally Open or Normally Closed?

S Bharadwaj ReddyJuly 22, 2016March 22, 2019

We discuss about concepts of Sink or Source used in electrical circuits or in PLC wiring. Also we deal with basics of normally open contact or normally closed contact which

Troubleshooting a 4-20mA Current loop

S Bharadwaj ReddyMay 13, 2016April 9, 2019

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

What is an O-Ring?

S Bharadwaj ReddyMay 12, 2016April 10, 2019

What is an O-Ring? An O-ring is a torus, or doughnut-shaped ring, generally molded from an elastomer, although O-rings are also made from PTFE and other thermoplastic materials, as well

How to Do Loop Checks During Plant Pre-Commissioning

S Bharadwaj ReddyMarch 3, 2016April 10, 2019

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

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Category : Basics