What are Open Loop & Closed Loop system
Introduction There are two types of control systems namely Open Loop & Closed Loop system ...
Tag : process
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...
How does a process control work?
Introduction. Process control is the automatic control of an output variable by sensing the amplitude of the output parameter from the process and comparing it...
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 be plugged by dirt, oil...
what is cascade control?
A simple control system drawn in block diagram form looks like this: Information from the measuring device (e.g. transmitter) goes to the controller, then to...
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 between two states. These controllers...
PROGRAMMING LOGIC DEVICES (PLC)
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,...
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...