The F20 is an universal electropneumatic positioner, suitable for rotary actuators (single or double acting). The F20 positioner operates on the principle of analog electric comparison. An analog 4-20mA input signal is used to obtain an accurate position of the actuator.
The F20 is a true 2-wire instrument, with the 4-20mA signal providing both the controlling signal and power supply for the electronics. An electronic module provides all the usual control characteristics:
zero, range and sensitivity are all electronically resetable using trimmers on the control card.
The modular construction allows the addition of a wide range of control options. These includes micro switches, inductive switches, pressure gauges, position transmitters and volume boosters.
Mounting according to industry standard VDI/VDE 3845 (NAMUR), with the drive coupling spring loaded for zero backlash.