Linear actuators with displacement encoder DFPIThe DFPI are controllable standards-based pneumatic double-acting linear actuators in accordance with ISO 15552 or DIN 3358. Product versions with an integrated displacement encoder (DFPI-…-E-…) or fully integrated positioner (DFPI-…-C1V-…) are available. In the version DFPI-…-E-…, the potentiometric displacement encoder supplies an analogue voltage signal proportional to the piston position. This can be used for operation with an external positioner. With the DFPI-…-C1V-…, the integrated positioner provides the positioning control function. This actuator has a factory-set safety position which is assumed if the operating voltage or the analogue setpoint value fails. The position is preset by an analogue setpoint signal of 4 to 20 mA. The position feedback is via an analogue feedback signal of 4 to 20 mA. The feedback signal provides the user with higher reliability and easier diagnostics. The electrical and pneumatic connection of the DFPI is via a plug socket, which also provides protection. Thanks to the standardised mounting interfaces to ISO 15552 or DIN 3358, there is a wide range of accessories for nearly every installation situation.