Omnitrol - Model 250 - Boiler Control Unit
The Omnitrol Liquid Level Control Model 250 is a chamber mounted unit designed for a variety of uses in boiler water level control applications. It utilizes a unique patented constantly engaged magnetic field concept which assures a positive switch in both the rise and fall of liquid levels without the introduction of springs or other mechanical devices. Unlike other Omnitrol units, the Model 250 utilizes a stainless steel internal float assembly rather than a displacer, housed within a cast iron chamber. It is supplied as standard with a SPDT mercury switch housed within any of three electrical enclosures.
- Positive Switch Action
- Constantly engaged magnetic field
- Flexibility of switch arrangements
- Easy Installation, virtually maintenance free
- CSA Approved
As with all Omnitrol liquid level controls, the Model 250 offers patented "snap action" operation based on the unique and proven principle of a constantly engaged magnetic field. A typical unit would have a ceramic magnet assembly which influences the position of the outer actuator/magnet.
As the float position changes with liquid level the inner magnet moves up or down within the magnetic field created by its association with the outer magnet. When a predetermined level change is achieved, the inner magnet either pulls down, or forces the actuator/magnet up causing a switch opening or closure, depending on increasing or decreasing liquid level.
All internal switch components are separated from the process liquid by a non-magnetic corrosion resistant stainless steel isolation tube.
Common Applications include low-water fuel cutoff, high water alarm and pump or auxiliary switch control.