Badger Meter SRD/SRI Valve Positioners - Manual (Page 12)

METHOD OF OPERATION
General
The intelligent positioner SRD960 and the pneumatic actuator form a control loop with the setpoint value w (from master
controller or control system), the output pressure y and the position x of the actuator on the valve
1 – SRD960 Intelligent Positioner
2 – Pneumatic Actuator
3 – Valve
Figure 6: Control loop
• The positioner can be attached to both linear actuators and rotary actuators
• Actuators with spring force are controlled by a single-acting positioner
• Actuators without spring force are controlled by a double acting positioner
HART or FoxCom Version
The positioner can be operated locally by means of local keys or handheld terminal, or remotely via PC-based configuration or
a corresponding control system, such as the I/A Series System
PROFIBUS-PA or FOUNDATION Fieldbus Version
The positioner can be operated locally by means of local keys, or remotely via a corresponding control system or can be
operated via PC-based configuration and operating tools, such as PC20 / IFDC
Page 12
Method of Operation
August 2014 POS-UM-00009-EN-02