Electrical components that are connected in such a way that the flow of electricity can take multiple, or parallel, paths through the circuit are said to be connected “in parallel”. If one of the components in a parallel circuit was to fail, the electricity would continue to flow through an alternative path.
pH: An indication of the acidity or alkalinity of a solution in units ranging from 0 (most acidic), to 7 (neutral), to 14 (most alkaline).
One of the constants used for PID control: proportional band, integral time, or derivative time.
Pressure Drop: The difference in upstream and downstream pressure of the fluid flowing through a valve.
The term process automation is used to refer to an automation system, the principal purpose of which is to automate or support the operator of a manufacturing process. Such a process can be the manufacturing or treatment of any goods made in a continuous or quasi-continuous manner such as fuel, paper, chemicals, food.
An industry in which raw materials are treated and converted into products by means of a series of stages (or processes). Process industries include oil and gas refining, pharmaceutical and chemical production, water and sewerage treatment etc.
Proportional Control: A method of changing the output of a controller by an amount proportional to the error.
Proportional-Integral Control (PI): Proportional and integral control combined.
Proportional-Integral-Derivative Control (PID): Proportional, integral, and derivative control combined.
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