FISHER 646 ELECTRO-PNEUMATIC TRANSDUCER

646 Electro-Pneumatic Transducer The Fisher 646 electro-pneumatic transducer uses a converter module that converts a 4 to 20 milliampere input signal to a proportional 0.2 to 1.0 bar ( 3 to 15 psig) pneumatic output signal. The converter module uses small parts of minimum mass, which are balanced symmetrically around a pivot point at the center of the mass. This balanced arrangement results in a high performance instrument that reduces sensitivity to vibration. An integral pneumatic relay provides the high capacity necessary to drive pneumatic control valve/ actuator assemblies without additional boosters or positioners. The transducer also provides stable, accurate operation when its output is transmitted to small volume chambers, such as a pneumatic positioner or other pneumatic instrument. Reduced sensitivity to vibration combined with high capacity and first order lag characteristics make the 646 transducer ideal for direct mounting on control valve/ actuator combinations. Connectors and piping can be installed with each 646 transducer for diagnostic testing. FISHER 646 ELECTRO-PNEUMATIC TRANSDUCER WITH FISHER 657 ACTUATOR AND E VALVE FISHER 646 ELECTRO-PNEUMATIC TRANSDUCER W4908-1 W6783-1 646 Transducer D101374X012 Product Bulletin 62.1: 646 January 2013  646 Transducer D101374X012 Product Bulletin 62.1: 646 January 2013 2 Specifications