Electropneumatic positioner KFM 3908

Applications:

Electropneumatic positioner KFM 3908 is mounted on pneumatic control valves and is used to assign the valve position to the control signal. The positioner compares the electric control signal of a control system to the stroke of the control valve and issues a signal pressure for the pneumatic actuator. The stroke is measured by the pick-up lever connected to a sensor installed in the positioner and the downstream electronics. When a system deviation occurs, the actuator is either vented or filled with air. The minimum and the maximum of the input signal correspond to the end positions of the valve. If necessary, the signal pressure change can be slowed down by a volume restriction.