Magnetic level gauges, also known as magnetic float level indicators, provide a reliable method of real-time liquid level measurement based on the principles of communicating vessels and magnetic coupling. When the liquid level in the measured container changes, the magnetic float inside the float chamber moves correspondingly. The magnet embedded in the float drives external bicolor magnetic flaps to rotate 180 degrees through magnetic coupling. The red-white interface indicates the actual liquid level within the vessel, thereby enabling precise liquid-level monitoring.
However, despite its reliability, users occasionally encounter situations where the liquid level inside the tank rises, but the gauge fails to reflect the corresponding change accurately. Upon further inspection, it is often found that the magnetic float has sunk to the bottom of the float chamber, causing measurement inaccuracies and operational inconvenience. This article provides an analysis of the common causes behind the magnetic float sinking issue in magnetic level gauges and offers practical advice for prevention and troubleshooting.
Common Causes of Magnetic Float Sinking:
1. Corrosion-Induced Leakage of the Magnetic Float
One of the primary reasons for the magnetic float sinking is corrosion-induced leakage. The magnetic float, being a critical component, must be adequately protected from corrosion. If the float material or protective coatings are improperly selected or poorly maintained, the float may fail when exposed to aggressive, corrosive liquids. Once compromised, liquid enters the float, significantly increasing its weight and eliminating its buoyancy. As a result, the float no longer moves with liquid level changes, resulting in incorrect or stagnant readings on the gauge.
To avoid this issue, selecting a float material with suitable corrosion resistance and ensuring regular inspections and maintenance are critical.
2. Magnetic Float Jamming Due to Accumulated Deposits
Another frequent cause is the jamming of the magnetic float within the float chamber. If the measured medium contains impurities or particulate matter, these contaminants may accumulate inside the float chamber or adhere to the surface of the magnetic float. Over time, this accumulation increases the float’s effective density, causing it to lose buoyancy and sink.
Regular cleaning and maintenance of both the float and the float chamber are recommended. Scheduled inspections and cleaning routines help maintain proper float movement, ensuring accurate level measurements.
In addition, float jamming may also occur if a replacement float does not match the chamber’s dimensions precisely. Typically, the inner diameter of the float chamber should always exceed the float’s outer diameter. If the replacement float is too large, even slight contamination may cause jamming. Therefore, verifying the exact inner diameter specifications of the float chamber before replacement and selecting an appropriately sized float is crucial.
3. Incorrect Magnetic Float Density Specifications
The magnetic float gauge operates based on Archimedes’ principle, and thus, precise float density specifications are critical. If the float’s density is too high, it will not rise with the increasing liquid level, leading to sinking or immobility.
Such density mismatches commonly result from miscommunication between the user and the manufacturer. Incorrectly reported medium density parameters cause the manufacturer to produce a float of inappropriate density, compromising the instrument’s functionality. To mitigate this risk, clear and accurate communication between the user and manufacturer regarding medium density, temperature, and pressure conditions is essential.
Conclusion
To prevent the issue of magnetic float sinking and ensure continuous and accurate level measurements, users should proactively conduct regular maintenance, select appropriate corrosion-resistant materials, and communicate clearly with manufacturers regarding operational conditions and requirements. Attention to these factors will significantly enhance the performance reliability of magnetic level gauges, contributing to more efficient and safer operations.