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SIPART PS2 positioners offer decisive advantages:
The SIPART PS2 electro pneumatic positioned is used to control the final control element of pneumatic linear or part-turn actuators. The electro pneumatic positioned moves the actuator to a valve position corresponding to the set point. Additional function inputs can be used to block the valve or to set a safety position. A binary input is present as standard in the basic device for this purpose.
The SIPART PS2 positioner is used, for example, in the following industries:
The SIPART PS2 positioner is available:
The SIPART PS2 positioner works in a completely different way to normal positioners.
Mode of operation
Comparison of the setpoint and the actual value takes place electronically in a microcontroller. If the microcontroller detects a deviation, it uses a 5-way switch procedure to control the piezoelectric valves, which regulates the flow of air into and from the chambers of the pneumatic actuator or blows it in the opposite direction.
The microcontroller then outputs an electric control command to the piezoelectric valve in accordance with the size and direction of the deviation (deviation between setpoint and actual values).
The piezoelectric valve converts the command into a pneumatic positional increment.
The positioner outputs a continuous signal in the area where there is a large system deviation (high-speed zone); in areas of moderate system deviation (slow-speed zone) it outputs a sequence of pulses. No positioning signals are output in the case of a small system deviation (adaptive or variable dead band). The linear or rotary motion of the actuator is detected by the mounting kit and transferred to a high-quality potentiometer over a shaft and a non-floating gear transmission.
The SIPART PS2 positioner is a digital field device with a highly integrated microcontroller. The positioner consists of the following components:
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