instrumentation
- Instrumentation
Humidity measuring devices
Introduction Humidity is a measure of the relative amount of water vapor present in the air or a gas. …
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WHAT IS ADAPTIVE CONTROL?
ADAPTIVE CONTROL Adaptive control is a method whereby the gain of a system can be varied depending on the position…
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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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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…
Read More » - Valves
what are pressure relief valves?
INTRODUCTION Protection against over pressure is one of the most important design tasks in the chemical, petrochemical, oil, and gas…
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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)…
Read More » - Flow Measurement
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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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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Zero Elevation and Zero Suppression in Level Measurement
Introduction It would be idealistic to say that the DP cell can always be located at the exact the bottom…
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