Fisher 49B7987X012 FIELDVUE Feedback Unit

Technical Specifications

Model：49B7987X012 Brand：Fisher Product Type: Positioner stroke feedback unit assembly

Module Feature

Fisher 49B7987X012 is FIELDVUE feedback unit specially designed for DVC6025 pneumatic valve positioner. It transfers valve actuator stroke movement into mechanical position feedback signal for positioner internal sensing mechanism. It adopts high strength alloy material with good vibration resistance and wear resistance. Widely used in oil,gas,chemical and power plant globe and rotary control valves.

Working principle: Convert valve mechanical stroke to position feedback signal Onboard components: Feedback cam, linkage arm, shaft assembly, mounting gaskets, fasteners

LED indicators

Not equipped

Hardware self-diagnosis

Visual inspection, linkage flexibility test, stroke feedback check, positioner calibration test

Programming software

No dedicated software required

Mechanical & Structure

Mounting: Installed on DVC6025 positioner housing Protection class:IP66

Environmental

Operating temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non-condensing Certification:ATEX,IECEx,CE Status:Fisher DVC6000 series positioner spare part

System compatibility

Compatible with Fisher DVC6025 pneumatic valve positioner and matched linear/rotary pneumatic actuators for industrial process control system.

Function

49B7987X012 is feedback unit manufactured by Fisher. It transmits valve stem movement to positioner internal sensing element, provides real-time stroke feedback for closed-loop positioning control. It guarantees positioning linearity and repeatability. Wear or linkage jam will cause valve positioning drift and oscillation. It is critical spare part for DVC6025 positioner overhaul.

Installation

Follow lockout/tagout safety procedure before installation. Cut off instrument air supply. Mount feedback unit on DVC6025 positioner housing, connect feedback linkage with actuator. Check linkage clearance and mechanical flexibility. Reassemble positioner, restore instrument air and perform zero/span calibration and full stroke test.

Interface

Positioner mounting bracket, feedback shaft linkage, fixed mounting holes, no LED indicators on 49B7987X012.

Diagnostic

Valve positioning drift: Worn feedback cam or linkage clearance abnormal. Stroke oscillation: Loose fastener or linkage mechanical friction too high. Position feedback loss: Shaft deformation or linkage disconnection.

Product Brief

49B7987X012 Fisher FIELDVUE feedback unit for DVC6025 pneumatic valve positioner,used for industrial control valve stroke feedback transmission maintenance,positioner feedback assembly spare part.