What is Profibus and what is its application in Instrumentation?

What is Profibus? Profibus is an industrial digital communication and it can be used to do bidirectional communication for the industrial field device. Profibus is widely used in the industrial sector because of its fast I/O data transferring capability. It is a multi-drop network which means that many devices can be connected on a single …

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Working of an Override Control  

Introduction The override control concept is a technique by which process variables are kept with in certain limits, usually for     protective purposes. Override control maintains the process in operation but within and under safer conditions.   Override control To illustrate override control, consider the simple process shown in Figure A hot, saturated liquid enters a process surge tank, and then it is then pumped into the process. Normally, the tank operates at the level shown, but if the level gets too low the liquid will not have enough net …

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Introduction A digitally operating electronic apparatus which uses a programming memory for the internal storage of instructions for implementing specific functions such as logic, sequencing, timing, counting and arithmetic to control through digital or analog modules, various types of machines or process.In this session we are gonna discuss about basics of programming logic devices (PLC) …


Different types of orifice plates

Introduction Orifice plates are mainly used for flow measurements. The orifice consists of a flat plate with a hole drilled in it. When a fluid passesthrough an orifice, the discharge is often considerably less than the amount calculated on the assumption that the energy is conserved and that the flow through the orifice is uniform and parallel.There are different types of orifice plates used for different fluids/process.  This reduction in flow is normally due to a contraction of the stream which takes place …

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