Fisher™ 3710 and 3720 Positioners and 3722
Electro-Pneumatic Converter
Fisher 3720 electro-pneumatic positioners are designed for use with either diaphragm or piston rotary actuators.These positioners provide a valve ball or disk position for a specific input signal. The 3720 is created by the addition of a Fisher 3722 electro-pneumatic converter to the 3710 positioner. The positioner provides a valve position in response to a DC current input signal and can easily be configured as single- or double-acting for rotary actuators.
Features3720 positioners use field-proven spool valve technology for a simple design that gives accurate, fast-responding operation with high cycle life.Case, components, and gasket materials withstand harsh environments.With EPDM O-rings and input module diaphragm, 3720 positioners can be used in low temperature applications.Can be used in applications with special material requirements, as in the food and beverage industry, pharmaceuticals, and tobacco processing.With the cover removed, all internal components are easily accessed.Changes in supply pressure and ambient temperature have minimal effect on positioner operation.To support diagnostic testing of valve/actuator/positioner packages, connectors, piping, and other hardware can be installed between the positioner and the actuator.Standard, low-profile indicator or optional beacon-style indicator mount easily to the positioner cover.
