Feedforward Control with Dynamic Compensation
As we have discussed, feedforward control is a way to improve the stability of a feedback control system in the face of changing loads. Rather than rely on feedback to…
Proportioning Feedforward action
Feedforward control works by directly modulating the manipulated variable in a control system according to changes sensed in the load(s). In order for feedforward to function optimally, it must adjust…
Feedforward Control Principle
Let us consider a liquid level control system on an open tank, where three different fluid ingredients (shown in the following P&ID simply as A, B, and C) are mixed…
What is Feedforward Control ?
“Feedforward” is a rather under-used control strategy capable of managing a great many types of process problems. It is based on the principle of preemptive load counter-action: that if all…
Relation Control System
A control strategy similar to ratio control is relation control. This is similar to ratio control in that a “wild” variable determines the setpoint for a captive variable, but with…
What is Ratio Control ?
Most people reading this article have likely had the experience of adjusting water temperature using two hand valves as they took a shower: one valve controlling the flow of hot…
Ratio Controller Example
An example of ratio control at work is in a process whereby hydrocarbon gases (usually methane) are converted into hydrogen gas and carbon dioxide gas. This is known as the…
Thermocouple Calculations
The voltage generated by a thermocouple is a function of the temperature difference between the measurement and reference junctions. Traditionally the reference junction was held at 0 °C by an…
Liquid In Glass Thermometer Principle
The liquid in glass thermometer, is the most commonly used device to measure temperature and it is inexpensive to make and easy to use. The liquid in glass thermometer has…
How to Convert Cable Size from AWG to Inches
How to Convert Cable Size from AWG to Inches ? Here is the formula for conversion of cable size from American wire gauge to inches. The diameter of a Number…
