Control System

The need for automatic controls

The subject of automatic controls is enormous, covering the control of variables such as temperature, pressure, flow, level, and speed.

shape of the trim determines the valve characteristic

Control Valve Characteristics

All control valves have an inherent flow characteristics that defines the relationship between ‘valve opening’ and flowrate under constant pressure

instrumentation engineering standards

ISA codes for Process Instrumentation

It is common to make letter combinations in PI&D diagrams according ANSI/ISA S5.1-1984 (R 1992) “Instrumentation symbols and identification”standard. In