process control


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process control

[′prä‚səs kən‚trōl]
(engineering)
Manipulation of the conditions of a process to bring about a desired change in the output characteristics of the process.

Process control

A field of engineering dealing with ways and means by which conditions of processes are brought to and maintained at desired values, and undesirable conditions are avoided as much as possible. In general, a process is understood to mean any system where material and energy streams are made to interact and to transform each other. Examples are the generation of steam in a boiler; the separation of crude oil by fractional distillation into gas, gasoline, kerosine, gas-oil and residue; the sintering of iron ore particles into pellets; and the polymerization of propylene molecules for the manufacture of polypropylene. In the wide sense, process control also encompasses determining the desired values.

Process control includes a number of functions, which can be arranged in a hierarchy, as follows:

Computerized instrumentation has revolutionized the interaction with plant personnel, in particular the process operators. Traditionally, the central control room was provided with long panels or consoles, on which alarm lights, indicators, and recorders were mounted. Costs were rather high, and surveyability was poor. In computerized instrumentation, visual display units can provide information in a concise and flexible way, adapted to human needs and capabilities. See Automation, Control systems

process control

The automated control of a process. Process control is used extensively in oil refining, chemical processing, electrical generation and the food and beverage industries where the creation of a product is based on a continuous series of processes being applied to raw materials.

Such systems typically deal with analog signals from sensors and meters that are transmitted to specialized computers which cause the temperature, pressure and flow to be continually adjusted (see DCS and PAC). Process control makes extensive use of analog/digital and digital/analog conversion. See process controller, control loop and industrial automation.
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Using Honeywell's optimization service Process Knowledge Toolkit (PKT) to improve paper process control, Alain Fortier, Domtar Windsor
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The strong growth at Tevet over the last two years validated the need for Tevet's parallel sensor, in-die measurement approach," said Yuval Wasserman, CEO of Tevet Process Control Technologies.
The degree of sophistication the mill desires will dictate what "level" of process control should be applied.
The court's decision now allows Process Control to resume its former method of controlling the level of material in the common hopper of its continuous gravimetric blenders by weight, using a PID loop.
Quality management within a latex laboratory and production facility can be divided into three important areas: supplier quality program, compounding and laboratory process control, and production or manufacturing process control.
Companies usually begin Statistical Process Control (SPC) with processes directly affecting their end product, such as raw materials or in-process operating conditions.
NYSE:A) today introduced the next tool in its campaign to help customers reduce costs and improve production quality: the Agilent Process Control Software.

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