Magnetic level indicators (MLIs) are widely used for liquid level measurement in industrial applications. Proper installation is critical to ensure measurement accuracy, long-term stability, and to minimize maintenance costs. The following key considerations should be observed during installation:
1. Avoid Material Inlet and Outlet Areas
Install the magnetic level indicator away from the inlet and outlet of the process media. This prevents turbulent flow or rapid level fluctuations in localized areas that could compromise measurement accuracy.
2. Ensure Vertical Alignment
The indicator must be installed as vertically as possible, with a deviation of no more than 3°. A shut-off valve (root valve) should be fitted between the tank flange and the indicator to facilitate future maintenance or cleaning.
3. Minimize Magnetic Field Interference
Avoid installing the device near strong magnetic fields or within 100 mm of ferromagnetic materials. Do not use iron-based clamps or supports, as they may interfere with the float’s magnetic field and cause erratic readings.
4. Correct Float Orientation
When inserting the float into the chamber, ensure that the magnetized end is facing upward and that the float can move freely up and down within the chamber. Incorrect float orientation can result in measurement errors or float jamming.
5. Provide Adequate Support
For installations where the MLI height exceeds 4–5 meters, additional bracing or intermediate supports should be installed. This prevents damage from environmental factors such as vibration, mechanical impacts, or high winds.
6. Allow for Cleaning Access
The installation location should allow easy access for periodic cleaning, especially when measuring media that can cause fouling or buildup inside the chamber.
7. Media Requirements
The process fluid should not contain solid particles or magnetic substances. These may obstruct the float’s movement and impair measurement accuracy.
Final Notes
While magnetic level indicators are robust and relatively simple to install, overlooking these technical details can lead to measurement inaccuracies or device failure. Always review the process media characteristics and site conditions before installation. When in doubt, consult with technical experts to ensure optimal performance and long service life.