Core Technical Advantages
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Precision Feedback: The standard unit utilizes a high-precision film-element potentiometer, while the long-stroke version uses a wirewound multi-turn potentiometer. This allows the transmitter to match its sense element span perfectly to the specific application, ensuring exceptional linearity across the entire travel range.
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Integrated Travel Limit Alarms: To eliminate the need for bulky, external mechanical limit switches, the 4200 can be equipped with electronic travel limit alarms. These use comparator circuits to monitor the potentiometer voltage directly, reducing mechanical complexity and potential failure points.
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Adjustable Alarm Deadband: The electronic alarms feature an adjustable deadband of up to 10% of the maximum span. This allows you to tune the alarm sensitivity to prevent “chattering” or nuisance alarms caused by minor process vibrations or mechanical play.
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Moisture-Protected Electronics: The housing is designed with an isolated field wiring compartment. This dual-chamber approach ensures that any moisture or contaminants entering through the conduit ports are trapped in the wiring area, protecting the sensitive electronic circuits from environmental damage.
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Compact Hybrid Design: Using a hybrid electronic architecture that combines discrete components with integrated circuits, the 4200 achieves high reliability while maintaining a very small footprint. This leaves ample room for mounting other accessories like solenoids or positioners on the same actuator.
Technical Core
| Feature | Technical Specification / Detail |
| Motion Types | Sliding-stem (Standard and Long-stroke) or Rotary (Quarter-turn) |
| Sense Element | Precision film-element or Multi-turn wirewound potentiometer |
| Output Signal | 4 to 20 mA DC (Standard) |
| Travel Capability | Sliding-stem: 13 to 606 mm (0.5 to 23.875 inches); Rotary: 0 to 90 degrees |
| Alarm Deadband | Adjustable up to 10% of maximum span |
| Protection | Isolated wiring compartment; Explosion-proof and Intrinsically Safe options |
| Operating Temp | Standard: -40 to 71°C (-40 to 160°F) |
Applications and Industry Sectors
The 4200 is often the “go-to” choice for providing position confirmation to a PLC or DCS in safety or monitoring loops.
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Oil and Gas: Monitoring the position of large-stroke actuators on pipeline surge valves or manifold isolation valves.
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Power Generation: Providing feedback for damper positions in boiler air-feed systems and steam vent valves.
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Water and Wastewater: Tracking the position of large rotary valves in filtration and distribution networks.
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Chemical Processing: Interfacing with Safety Instrumented Systems (SIS) to confirm valve closure or opening during emergency events.
Xi’an Yunrui Trading Co., Ltd. Technical Support
Xi’an Yunrui Trading Co., Ltd. is a major supplier of Fisher brand products, providing a comprehensive range of Fisher solutions. We specialize in providing original, high-efficiency Emerson automation solutions to industrial clients. Beyond supplying core hardware like the 4200 Position Transmitter, we leverage deep technical expertise to provide professional support and model selection guidance for procurement and engineering projects. By optimizing our supply chain, we provide a distinct pricing advantage, ensuring we offer highly competitive prices while assisting clients in optimizing processes and achieving digital upgrades.
If you are replacing an older mechanical limit switch setup and need to verify the mounting bracket compatibility for your current actuator, please contact our technical team for a detailed dimensional check.
