Flow Controllers
Flow Controllers are mechanical or electro-mechanical devices composed of measuring sensors or controlling elements that are used to ensure media flow in manufacturing processes. Key specifications include the intended application, type, media, flow rate, connection style, pressure rating, as well as mounting style. Flow controllers are used primarily in process control applications. They are made for gases as well as liquids of many types, and are available in many sizes and configurations depending on the application. Some flow controllers consist of mechanical valves, while others are electronically operated and controlled. Flow controllers are sometime called batch controllers for their ability accurately control different ingredients in a chemical batching process, for instance.
Level Controllers
Level Controllers are mechanical or electro-mechanical devices used for controlling the levels of tanks, vats, etc. usually by means of pumps, and they are sometimes called pump controllers. Some level controllers incorporate sensors or other means of detecting the level of products in containers, etc. while others require inputs from remote switches or sensors. Key specifications include the intended application, medium type, and the control method. Level controllers rely on a variety of sensor styles including conductive, capacitance, optical, and ultrasonic, in addition to mechanical arms, floats, and levers. They can be used for liquids or bulk dry goods such as grain or powders. Many industries use level controllers in various processes. A level controller receives an input signal, compares it to a set point and via an output signal adjusts the level as the process requires.
Pressure Controllers
Pressure Controllers are electro-mechanical devices used for controlling process/system pressure in various industrial processes. Key specifications include the intended application, type, control method, sensing element, and the pressure range. Pressure controller types include differential gap, proportional, on/off types, among others. They rely on a variety of sensing elements such as a bellows, diaphragms, capsules, bourdon tubes, etc. In operation, the controller receives a process/system pressure input, compares it to the desired set point in the pressure controller, then outputs a signal (usually to a control valve) which adjusts the process/system pressure (if necessary) back to the set point.
Programmable Logic Controllers
Programmable Logic Controllers are electronic devices used for controlling automatic machinery, processes, etc. Key specifications include the intended application, type, function, mounting style, as well as power requirements. Programmable logic controllers are configurable with a range of input and output modules. They control various operating parameters and functions by receiving input signals from various sources and adjusting machine functions as required by the processes through sets of programmed instructions. Some PLC makers have begun marketing programmable automation controllers, or PACs, which are have features beyond those of ordinary PLCs but perform similar tasks. PLCs are modular in construction and can be fitted with various modules for inputs, outputs, etc.
Universal Process/Temperature Controllers
Universal Process/Temperature Controllers are electronic devices used to control various process parameters, including temperature. Key specifications include the intended application, control method, input and output types, features, connections type and mounting style, number of inputs, communication interface, as well as the power specifications for the input and output process. Universal process/temperature controllers are used mainly in manufacturing applications for ensuring various process values are within their operational ranges. Several types of control methods include set point, proportional, etc. as well as input types such as thermocouples, voltage, etc. that are used to sense and control process parameters. Controllers can be mounted in panels, walls, DIN rails, etc. Typical applications include boilers, lasers, tanks, molding machines, pumps, furnaces, etc.
Answer:
Be able to discuss different examples of devices that can be controlled by computers.
~Security Lights.
~Burglar Alarms.
~Central Heating Controllers.
~Computer Controlled Greenhouses.
Explanation:
