Instrumentation
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WHAT IS RATIO CONTROL ?
RATIO CONTROL A ratio controller is a special type of feed forward controller where disturbances are measured and their ratio…
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Pressure Relief valves
Overview: The Relief valves are safety valves prevent equipment damage by relieving accidental over-pressurization of fluid systems. The relief valves…
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What are pneumatic controllers ?
Introduction A controller is a device that senses differences between a desired condition and measured condition in a process. .The…
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BASICS OF AN INSTRUMENT AIR SUPPLY SYSTEM
Introduction The air used must be cleaned, dry and oil-free to ensure that small lines, restrictions and nozzles will not…
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what is cascade control?
A simple control system drawn in block diagram form looks like this: Information from the measuring device (e.g. transmitter)…
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Strain gauge pressure measurement
The strain gauge is a passive transducer used to pressure, which converts the change in pressure into a change in…
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what are venturi tubes?
INTRODUCTION Venturi tubes, flow nozzles, and flow tubes, like all differential pressure producers, are based on Bernoulli’s theorem. General performance…
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Radiation level measurement techniques
The radiation/nuclear level measurement technique is used to measure the level of fluid or solid in a closed tank using…
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FAIL SAFE LADDER LOGIC PROGRAM
Fail-safe design In control systems, safety is (or at least should be) an important design priority. If there are multiple…
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BASIC LADDER LOGIC PROGRAMS
Ladder diagrams Ladder diagrams are specialized schematics commonly used to document industrial control logic systems. They are called “ladder” diagrams…
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