Control System: Process Control And Process Industry

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Process control system the Process as used in the terms process control and process industry, refers to methods of or materials to create end products. The raw materials, which either pass through or remain in a liquid, gaseous, or (a mix of solids and liquids) state during the process, are transferred, mixed, heated or cooled, filtered, stored, or handled in some other way to produce the end product.
Process industries include the chemical industry, the oil and gas industry, the food and beverage industry, the pharmaceutical industry, the water treatment and the power industry.
Control in process industries refers to the regulation of all aspects of the process. Precise control of level , temperature, pressure and flow is important in many process applications. Process control technology is the tool that enables manufacturers to keep their operations running within specified limits and to set more precise limits to maximize profitability, ensure quality and safety. …show more content…

Types of controls:

Analog Control system: In an analog control system, the process parameters are measured by the transmitter. The transmitter generates 4 to 20 current signal corresponding to 0 to 100% of the process parameter measured. This signal is converted to 1 to 5V DC and given as input signal to the amplifier. The desired set point is also given the operational amplifier. The operational amplifier calculates the output based on the input and the set point. The 4- 20 mA current output is given to an I/P converter and then to the final control

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