Fisher® 2500 pneumatic level controllers are rugged, dependable, and simply constructed pneumatic instruments. In conjunction with a Fisher® 249 Series sensor, they sense liquid level or interface level in a vessel, and produce a standard pneumatic output signal proportional to the process variable.
Features & Benefits
Easy Adjustment—Set point, proportional valve opening, and reset changes are made with simple dial-knob controls.
Simple, Durable Construction—Few moving parts are used. Knife-edged driver bearing in sensor and plated brass instrument case ball bearing for torque tube rotary shaft help provide low-friction operation. Sensors are available in ratings up to CL2500.
Mounting Versatility—Caged sensors are available in a variety of orientations and connection styles, and all sensors can be either right- or left-hand mounted.
Sensitive to Small Changes—Displacer reaction to small specific gravity changes allows these instruments to be used for density applications and in other applications where a response to low levels of input signal change is required.
Easy Reversibility—Action is field reversible from direct to reverse or vice versa without additional parts.
Reduced Maintenance Costs—Spring-out wire provides for in-service cleaning of relay orifice. Torque tube can be replaced without removing torque tube arm.
Reduced Operating Costs—Supply pressure conservation is enhanced in all constructions because relay exhaust opens only when output pressure is being reduced.
Smaller Vessel Sizes Required for Stable Control—Caged 249 Series sensors come standard with a liquid damping orifice in the lower equalizing connection that helps stability where vessel capacitance is small and permits narrower proportional valve settings.
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