Difference between actuator and positioner
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THE CONTROL VALVE HANDBOOK
The fourth edition of the Control Valve Handbook presents vital information on control valve performance and the latest technologies. The book is both a textbook and a reference on the strongest link in the control loop—the control valve and its accessories. It includes knowledge from experts in the process control field, including contributions from ISA and Crane Co.
CONTROL VALVE ACTUATORS AND POSITIONERS
Control valves need actuators to operate. This tutorial briefly discusses the differences between electric and pneumatic actuators, the relationship between direct acting and reverse acting terminology, and how this affects a valve’s controlling influence. The importance of positioners is discussed with regard to what they do and why they’re required for many applications.
AS-I NETWORKS FOR ACTUATORS
In 1990, a consortium of successful companies in Germany created a bus
system for networking sensors and actuators called Actuator Sensor Interface (AS-Interface or just AS-i). This bus was meant to meet some requirements based on the experiences of the group’s founding members, and supply the market’s
bit-oriented hierarchy. So, the AS-i network was conceived to complement other systems, and to simplify and speed up connections between sensors, actuators and their controllers. This online tutorial explains how to set up such a network.
Hope this helps you....
The fourth edition of the Control Valve Handbook presents vital information on control valve performance and the latest technologies. The book is both a textbook and a reference on the strongest link in the control loop—the control valve and its accessories. It includes knowledge from experts in the process control field, including contributions from ISA and Crane Co.
CONTROL VALVE ACTUATORS AND POSITIONERS
Control valves need actuators to operate. This tutorial briefly discusses the differences between electric and pneumatic actuators, the relationship between direct acting and reverse acting terminology, and how this affects a valve’s controlling influence. The importance of positioners is discussed with regard to what they do and why they’re required for many applications.
AS-I NETWORKS FOR ACTUATORS
In 1990, a consortium of successful companies in Germany created a bus
system for networking sensors and actuators called Actuator Sensor Interface (AS-Interface or just AS-i). This bus was meant to meet some requirements based on the experiences of the group’s founding members, and supply the market’s
bit-oriented hierarchy. So, the AS-i network was conceived to complement other systems, and to simplify and speed up connections between sensors, actuators and their controllers. This online tutorial explains how to set up such a network.
Hope this helps you....
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