LevelSite is a magnetic rotary indicator. It is a reliable level measurement system for applications with operating pressures up to 4500 psig (310 bar), operating temperatures up to 600°F (316°C), and with liquid to a minimum specific gravity of 0.5049. LevelSite’s visual indicators and electrical switches are isolated from the liquid; the tank remains sealed from the surrounding environment (See Figure 2). Accidental spills from sight-glass breakage are eliminated. LevelSite consists of 3 major components: the float housing, a magnetic float, and the rotating flag assembly. The float housing is an engineered pressure vessel which is externally mounted to the tank. The float housing is designed to handle the same temperatures and pressures found in the tank. It is fabricated from a variety of materials, depending on the application. The alloy models are usually stainless steel. Engineered plastic models use polyvinylchloride (PVC), polypropylene (PP) or polyvinyliden fluoride (PVDF). Other materials are available on request. The float (See Figure 3), is equipped with a permanent ring magnet assembly. This assembly rides at the surface of the liquid contained within the float housing, rising and falling as the liquid in the tank rises and falls. As the float moves up and down, a magnetic flux field maintains continuous contact between the magnetic float and the rotating flag assembly. The rotating flag assembly is connected to a switch on the float housing. When the float rises and falls, the magnetic flux is cut off and reconnected, causing the switch to open and close. The switch controls a relay connected to the control system. If the switch is closed, the relay opens and sends a signal to the control system indicating that the liquid level in the tank is high. If the switch is open, the relay closes and sends a signal to the control system indicating that the liquid level in the tank is low.