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Instrumentation

BASICS OF AN INSTRUMENT AIR SUPPLY SYSTEM

Introduction The air used must be cleaned, dry and oil-free to ensure that small lines, ...
Valves

what are pressure relief valves?

INTRODUCTION Protection against over pressure is one of the most important design tasks in...
Control System

what is cascade control?

A simple control system drawn in block diagram form looks like this:   Information from the...
Instrumentation

Strain gauge pressure measurement

The strain gauge is a passive transducer used to pressure, which converts the change...
Flow Measurement

what are venturi tubes?

INTRODUCTION Venturi tubes, flow nozzles, and flow tubes, like all differential pressure producers, are based...
Instrumentation

Radiation level measurement techniques

The radiation/nuclear level measurement technique is used to measure the level of fluid or...
Instrumentation

FAIL SAFE LADDER LOGIC PROGRAM

Fail-safe design In control systems, safety is (or at least should be) an important design...
Instrumentation

BASIC LADDER LOGIC PROGRAMS

Ladder diagrams Ladder diagrams are specialized schematics commonly used to document industrial control logic systems....
Instrumentation

Zero Elevation and Zero Suppression in Level Measurement

Introduction It would be idealistic to say that the DP cell can always be located...
Valves

Basics of Butterfly valves

The butterfly valve is a rotary control valve. Standard butterfly valves are dampers that are...
Control System

BASICS OF ON/OFF CONTROLLER

Introduction In control theory, an on/off controller, also known as a hysteresis controller, is a...
Pressure Measurement

Capacitance pressure transmitter

Capacitance pressure transmitter is a pressure measurement device which convert applied pressure into a...
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