Tham khảo tài liệu 'plastics engineered product design part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 540 Plastics Engineered Product Design Temperature controller heating overshoot cừcuit Used in temperature controllers to inhibit temperature overshooting on warm-up. Temperature detector resistance RTD contains a temperature sensor made from a material such as high purity platinum wire resistance of the wfte changes rapidly with temperatures. These sensors are about 60 times more sensitive than thermocouples. Temperature measurement Temperatures can be measured with thermocouple T C or resistance temperature detector RTD . T Cs tend to have shorter response time while RTDs have less drift and are easier to calibrate. Traditionally PID controls have been used for heating and on-off control for cooling. From a temperature conơol point the more recent use is die fuzzy logic control FLC . One ofFLCs major advantage is the lack of overshoot on startup resulting in achieving the setpoint more rapidly. Another advantage is in its multi-variable control where more than one measured input variable can effect the desired output result. This is an important and unique feature. With PID one measured variable affects a single output variable. Two or more PIDs may be used in a cascade fashion but with more variables they are not practical to use. Temperature proportional-integral derivative Pinpoint temperature accuracy is essential to be successful in many fabricadng processes. In order to achieve it microprocessor-based temperature controllers can use a proportional-integrated-derivative PID control algorithm acknowledged to be accurate. The unit will instandy idendfy varying thermal behavior and adjust its PID values accordingly. Tex A unit for expressing linear density that is equal to the mass of weight in grams of 1 000 m of fiber filament yarn or other textile strand. Thermodynamic It is the scientific principle that deals with the interconversion of heat and other forms of energy. Thermodynamics thermo heat and dynamic changes is the study of these energy transfers. The
