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As an effective visual indicator, the magnetic level indicator is widely used throughout process industries.
A magnetic level indicator is often used in applications where a sight glass (or glass sight gauge) is either ill-suited based on process variables or is underperforming based on plant requirements. These can include enhanced safety for personnel; environmentally risky situations including media leakage or fugitive emissions; need for maintenance reduction; or need for high visibility from a distance.
High pressures, extreme temperatures, deteriorating seals/rings/gaskets, and toxic or corrosive materials may cause a risk of fugitive emission of dangerous substances.
Liquid/liquid interfaces can be very difficult to read in a sight glass particularly if the liquids are of similar color. Clear liquids can also be difficult to see in a sight glass.
The glass in a sight glass can become quickly discolored, thus decreasing level visibility, or it can acquire microfractures, which can become a personnel safety issue if left undetected.
Liquids that tend to coat or build-up on surfaces can hinder visibility by forming an opaque film on the glass.
To cover a large measuring span, sight glass assemblies typically must be staggered using multiple sections.
Improved safety due to the absence of fragile glass and a substantially reduced number of potential leak points.
Greatly increased visibility.
Easier initial installation and addition of transmitters and switches without interrupting the process.
Dual-technology redundancy, with the addition of transmitters or switches, for improved safety.
Lower long-term cost of ownership and legitimate return-on-investment benefits.
The obvious safety benefit of the magtech Magnetic Level Indicator over a sight glass is reduced chance of breakage. If the process fluid is under extreme pressure or temperature, the likelihood of sight glass breakage is increased. The pressure boundary of an Magnetic Level Indicator is made of robust metal, frequently the same as the vessel piping, making Magnetic Level Indicators as safe as the surrounding piping system itself. The indicators, transmitters, and switches are all mounted externally and, therefore, are unaffected by toxicity, corrosiveness, or other process fluid characteristics.
Another safety benefit is that the chemical compatibility with the fluid in an Magnetic Level Indicator is restricted to only three components, the metallic chamber, gaskets and float. With glass sight gauges, the process fluid may have chemical compatibility issues with any of the wetted materials—glass, metal, or sealants.
Visibility of the fluid level from long distances is another major reason for selecting an Magnetic Level Indicator over a sight glass gauge. Sight gauge level indicators are intended to be viewed at maximum distances of around 10 feet (3 meters). However, the bright contrasting colors of the flags or a fluorescent shuttle on an Magnetic Level Indicator permit visible level indication at distances up to 100 feet (30 meters) or greater. Newer, more advanced visual indicators, such as those from Kaidi, have viewing ranges up to 200 ft. (60 m).
Magnetic Level Indicators are virtually maintenance free once installed because the indicator never touches the process fluid. With sight glasses, the gauges must be periodically checked for leaks and cleaned on a regular basis. Scaling, etching and build-up on the glass from the process fluid can cause the sight glass to become unreadable.
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