The US Fisher Company began in 1880. Emerson purchased Fisher in 1992, and so it is a division of Emerson Electric Company.
Fisher's products are widely used in petroleum, gas, papermaking, oil refining, food and beverage, chemical, pharmaceutical, power, metal and smelting, semiconductor and other industries. Its products include control valves, sensors, actuators, digital level controllers, software, field-installed instruments, pressure regulators, etc.
Fisher level transmitter is designed to use Archimedes' principle to measure the liquid level, liquid interface level or density/specific gravity changes in the process vessel. It can be divided into Fisher 249 series outer float sensor and Fisher 249 series inner float sensor.
For vessels with internal obstacles or considerable internal turbulence, the operation of Fisher 249 outer float level sensor is more stable than that of inner float sensor.
Fisher 249 series internal float sensors are usually used in applications that require large floats, which are provided through large flange connections. The float can be lowered to the required depth through different float connecting rod lengths.
Fisher 4200 electronic position transmitter (Fisher position transmitter) can sense rotating or sliding lever valves, drain holes, shock absorbers, or other devices. After the instrument is installed, the potentiometer shaft is mechanically connected to the device to sense mechanical movement.
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