Chapter 06 - Controller

Chapter 06 - Controller - CHAPTER VI CHAPTER VI CONTROLLER...

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Unformatted text preview: CHAPTER VI CHAPTER VI CONTROLLER CONTROLLER CONTROLLER CONTROLLER ontroller is an element hich is required ¡ Controller is an element which is required to emit certain control signals to a system. controller is the active element in each ¡ A controller is the active element in each control configuration which receives information from a measuring system and takes the necessary action by changing a value to the set point limit. And determines an appropriate output to the final control element. ¡ Two types: Analog Controller and Digital Dr. Abdirahman CHAPTER 6 Page 2 of 15 Controller. ¡ Safety¡– an¡important factor for all process The Need for Control The Need for Control y p p industries.e.g the usage of temperature limit, pressure and others should not exceed the allowed limit. ¡ Production specification – all production must have a certain quality standard to ensure that the value of production quality can be fulfilled. ¡ Environmental rules – all production must not in any ay pollute the environment.e.g the usage of a way pollute the environment.e.g the usage of a chemical substance must not exceed the allowed concentration. ¡ Operational constraint – the equipment used must have a usage limit.e.g the filling of tank without exceeding the limit. ¡ Economy – the production operation must be in ccordance to the market demand with ensuring Dr. Abdirahman CHAPTER 6 Page 3 of 15 accordance to the market demand with ensuring minimum operation cost and maximum revenue. Dr. Abdirahman CHAPTER 6 Page 4 of 15 1. ANALOG CONTROLLER 1. ANALOG CONTROLLER ¡ The controller is in analog form (pneumatic/electronic) and all the ignal transmission is in analog form...
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This note was uploaded on 05/09/2010 for the course CHE 3022 taught by Professor Abdirahman during the Fall '07 term at National Central University.

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Chapter 06 - Controller - CHAPTER VI CHAPTER VI CONTROLLER...

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