A magnetic level indicator is an externally mounted chamber with visual indicators that are completely isolated from the process liquid. Inside the chamber is a magnetic float that rises and falls with the level of the liquid. When the float moves, it causes flags inside the chamber to turn and mark the level on an exterior indicator numbered roughly like a meter stick. Magnetic gauges are often used in conjunction with through-air or guided wave radar as a redundant level measurement.
Magnetic level transmitters were initially introduced as alternatives to sight glasses. Over time, glasses become compromised through leaking seals, clouding, and breakage; MLI technology is not susceptible to these weaknesses.
What are the advantages of using a magnetic level transmitter?
The chief benefit of using an MLI is isolation from process liquid. Separation allows for easy access to the level gauge for cleaning and eliminates contact with difficult media. Magnetic level indicators are commonly low-cost in comparison with other level technologies, and can provide visual indication of level from a distance. In fact, VEGA magnetic gauges make level visible from up to 200 feet away.