automatic valve system and positioner, until recently, most of the valve and actuator is used as a simulation of the system components. Process industry has entered a new golden age today, facing the process control is changing, so that the flexible technology is quickly beyond outdated cao the once popular mold quote system. Flexible terminal control components such as installed on the valve or installed on the used for actuator positioner of flexible systems, there are few or no moving parts. Apply the word communication performance of 4 - far superior to the VP simulation system The signal of 20 ma. In addition. Today's flexible terminal control element provides many new features, such as automatic loop tuning, its diagnosis information processing, maintenance plan and Sue/alarm management.

in order to know the terms of flexible products and function, must first understand the instrumentation, control principle and its commonly used terms. 6. 1. 2 controller and sensor distribution control system a lot and process control system for the connection and terminal control components, such as control of min and actuators, using the controller or distributed control system to provide the information in the control loop. Controller is a micro processor, it receives input from the technology of sensor, such as pressure or temperature sensors or meter, and compared with preset value this information, after comparison, it sent a signal to the right terminal control element until to the expected value. In today's commonly used Industrial Valves controller with a for loop tuning mode of three-way, in other words, the user adjust the proportion, integral and derivative set, they are often called PD control. For PID control, the three set can be adjusted to control loop optimization or to provide reliable control loop characteristics. For example, in the change between the set point and process variables can be automatic correction or increase the system to improve system response speed.

for larger valve controller is DCS distribution control system. DCS is - Center of a micro processor, it is designed to accept data from a number of facilities and control its feedback to several terminal control element. For DCS, all input wire and terminal control element are guided to - A central area, usually in a control room, DCS is located here.

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