Fisher™ Model 846 translates an electrical output signal from a controller to a pneumatic signal that is required for the operation of a control valve actuator or pneumatic positioner. This transducer functions masterfully in vibration, thanks to its durable construction, mechanically-damped deflector bar and low-mass pilot stage. Its key electrical and mechanical components are integrated into a solitary field-replaceable master module.
The 846 features an electronic feedback control network that monitors the pneumatic output signal for input-output aberrations and makes corrections. Its free-flow pilot stage design, wide internal pneumatic supply passages and large diameter nozzles help minimize the consequences of contaminant build-up and erosion.
Stroke Port allows a continuous bleed from the pilot stage to escape via a hole in the module cover. The transducer output can be elevated by covering the hole, thus verifying the appropriate operation of the pilot and booster stages and stroking the actuator.
The 846 features an electronic feedback control network that monitors the pneumatic output signal for input-output aberrations and makes corrections. Its free-flow pilot stage design, wide internal pneumatic supply passages and large diameter nozzles help minimize the consequences of contaminant build-up and erosion.
Stroke Port allows a continuous bleed from the pilot stage to escape via a hole in the module cover. The transducer output can be elevated by covering the hole, thus verifying the appropriate operation of the pilot and booster stages and stroking the actuator.
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