Fisher 846 Electronic Feedback 4-20mA Current Pressure Electro Pneumatic Transducer

The Fisher 846 is an electro-pneumatic (I/P) transducer that converts a standard electrical input signal into a proportional pneumatic output signal. It is commonly used to translate a 4-20 mA controller signal into the pneumatic pressure needed to operate a control valve actuator or pneumatic positioner.

This field-mountable transducer incorporates electronic feedback that continuously monitors the pneumatic output and corrects for deviations caused by supply pressure variations or downstream leakage. Its design includes a low-mass pilot stage with a mechanically damped deflector bar for stable operation under vibration, along with large-diameter nozzles and free-flow passages that improve tolerance to contaminants and erosion. Major mechanical and electrical components are combined in a single field-replaceable master module. A stroke port allows simple verification of pilot and booster stage operation by covering the vent hole to increase output pressure.

Used in process control systems across oil and gas, chemical processing, power generation, refining, and general industrial plants where electronic controller signals must be converted to pneumatic actuator pressure.

Supply pressure fluctuations, air contamination, vibration, or downstream leakage can affect conventional transducers. The Fisher 846 electronic feedback network and contaminant-tolerant nozzle design help maintain stable output under these conditions.

Suitable as a direct or functional replacement for similar current-to-pressure transducers in existing control valve installations.

We supply genuine Fisher (Emerson) instrumentation and provide practical support for correct model selection and process integration.

Typical production and delivery time is 6-8 weeks.

Please provide required input/output ranges, action (direct/reverse), certifications, mounting preference, and quantity for a tailored quotation.