Troubleshooting a 4-20mA Current loop
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...
Category : Basics
Instrumentation Engineering Basics
What is an O-Ring?
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
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
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...
Process Control Fundamentals
Process Control In almost all industrial process applications, control of process variables is critical to the safe and efficient operation of the process. The most common variables controlled are pressure,...
Why Use a Current Loop?
A Little Bit of History Before the advent of electronic circuitry, process control was a wholly mechanical endeavor. Facilities used pneumatic control signals where controllers were powered by varying pressures...
Basics of 4-20mA Current Loop
The 4-20 mA current loop is a very robust sensor signaling standard. Â Current loops are ideal for data transmission because of their inherent insensitivity to electrical noise. In a 4-20...
Basics of 4 to 20 mA analog Signals
The  most  popular  form of signal transmission  used in modern  industrial  instrumentation  systems is the 4 to 20 milliamp DC standard. This is an analog signal standard, meaning that the...
Understanding a Process Control Loop
Hi, its me again and I am about to tackle a very important framework in the field of Instrumentation. Assuming you already have read my post regarding what is a...
What is Process Control ?
First we need to understand what process control is and what are the important technical terms and parameters involve in this process. Process control is a statistics and engineering discipline that...