Fisher® 4200 electronic position transmitters combine field-proven electronic and mechanical expertise in a versatile, accurate instrument that senses the position of a device, and sends a standard (4 to 20 milliampere) output signal to an indicating device. The 4200 transmitters are available as a transmitter only, a transmitter with integral high and low electronic travel limit alarms or with high and low position switches only.
High Accuracy—A precision film-element potentiometer in the standard unit and a precision multi-turn wirewound potentiometer in the long-stroke unit provide exceptional linearity by matching the span of the sense element to the application.
Application Versatility—This instrument may be used with sliding-stem or rotary valves as well as with other mechanical devices such as furnace dampers or louvers.
Electronic Travel Limit Alarms—To eliminate the need for externally mounted mechanical limit switches, instruments with travel limit alarms incorporate comparator circuits that monitor the sense potentiometer voltage output.
Adjustable Deadband—Electronic travel limit alarms have an adjustable deadband up to 10 percent of the maximum span.
Compact Design—The instrument, even with travel limit alarms, uses little space when mounted, allowing room for additional devices.
Durable Construction—A rugged housing and a corrosion-resistant coating on the printed wiring board help protect the instrument from harsh environments.
Simple Circuitry—A simple hybrid electronic design combines the best qualities of discrete components and integrated circuits for improved reliability and performance.
Easy Maintenance—The simple design of the transmitter and alarms allows easy maintenance. The high reliability of the instrument requires minimum spare parts inventory.
Moisture Resistant—The field wiring compartment is isolated from the electronic compartment. This protects the electronic circuits from any moisture brought into the housing via the field wiring ports.
Field Reversible Action—The output is easily reversed in the field simply by switching two potentiometer leads on the printed wiring board.
Electromagnetic Interference (EMI) Filters—Filters between the electronic compartment and the field wiring compartment of the housing help provide protection against electromagnetic interference.
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