Process automation

How PLC Systems are Protected from Plant Voltages

Internally a PLC typically operates at 5 V dc. The external devices such as solenoids, limit switches, motor starters, etc.…

11 months ago

Key Requirements for Industrial Control Computers

A computer is often used as part of a control system. The input data is typically from the operator’s commands…

11 months ago

Analog vs. Digital Controllers

Analog signals pass continuously through a full range of values for example a measuring device converts the process variable (PV),…

1 year ago

Steam-heated Reboiler Control System

When steam-heated reboilers are used in distillation columns and the heating medium is steam, a flow control loop for the…

1 year ago

Furnace Control System for a Rapidly Changing Demand

Let’s consider the figure below: Figure 1.0 Typical single-fuel cross-limited combustion control system In the system above, the output of…

2 years ago

The Instrumentation for Furnace Control

The figure below shows a typical basic furnace used to raise the temperature of a heat-transfer medium that is used…

2 years ago