- Control System
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 » - Pressure Measurement
Strain gauge pressure measurement
The strain gauge is a passive transducer used to pressure, which converts the change in pressure into a change in…
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…
Read More » - Level Measurement
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…
Read More » - Instrumentation
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…
Read More » - Instrumentation
BASIC LADDER LOGIC PROGRAMS
Ladder diagrams Ladder diagrams are specialized schematics commonly used to document industrial control logic systems. They are called “ladder” diagrams…
Read More » - Instrumentation
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…
Read More » - Valves
Basics of Butterfly valves
The butterfly valve is a rotary control valve. Standard butterfly valves are dampers that are shaped from discs which rotate in…
Read More » - Instrumentation
BASICS OF ON/OFF CONTROLLER
Introduction In control theory, an on/off controller, also known as a hysteresis controller, is a feedback controller that switches abruptly…
Read More » - Pressure Measurement
Capacitance pressure transmitter
Capacitance pressure transmitter is a pressure measurement device which convert applied pressure into a current signal. Capacitive type pressure transmitter…
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