846

The Fisher 846 transducer converts an electrical output signal from a controller to a pneumatic signal necessary to operate a control valve actuator or pneumatic positioner. Using electronic feedback, the transducer can correct for error-producing effects, such as variations in supply pressure and downstream leakage.
846
Features

  • The low-mass pilot stage, mechanically damped deflector bar, and rugged construction provide stable performance in vibration.
  • Large diameter nozzles, free-flow pilot stage design, and large internal pneumatic supply passages provide excellent tolerance to reducing the effects of contaminant build-up and erosion.
  • The electronic feedback control network monitors the pneumatic output signal, detects any input-output deviations and corrects them.
  • Major mechanical and electrical components are incorporated into a single field-replaceable master module.
  • With Stroke Port, a constant bleed from the pilot stage vents through a hole in the module cover. Covering the hole increases the transducer output to confirm the proper operation of the pilot and booster stages and stroke the actuator.
     

846  Bulletin  Instruction Manual