What key details should be paid attention to when installing a magnetic flap level gauge?

As a common liquid level measuring instrument, the installation quality of a magnetic level gauge (MLG) directly impacts measurement accuracy and service life. Correct installation ensures reliable data, reduces maintenance costs, and prevents equipment damage.

Critical Installation Considerations:

1.  Avoid Inlet/Outlet Nozzles: Position the MLG away from the vessel's inlet and outlet nozzles to avoid turbulent flow, which can cause unstable level readings and measurement inaccuracies.

2.  Vertical Installation: Mount the gauge vertically. Deviation from true vertical must not exceed 3° (degrees). A root (isolation) valve must be installed between the vessel flange and the gauge for isolation during maintenance and cleaning.

3.  Prevent Magnetic Interference: Avoid strong magnetic fields near the installation site. Ensure no magnetic materials are present within 100mm (approx. 4 inches) of the measuring chamber. Iron clamps must not be used for securing the indicator assembly.

4.  Correct Float Orientation: Install the float with its magnetic end upwards   .    The float must move freely throughout the entire length of the chamber without obstruction. Verify correct orientation and free movement after installation to prevent measurement errors.

5.  Support and Protection: For installations exceeding 4-5 meters in height,    supporting cables (guide wires) or intermediate supports must be added to both sides of the chamber. This provides mechanical stability and prevents damage in harsh environments (e.g., mechanical vibration, physical impact, high wind loads).

6.  Access for Maintenance: The installation location must provide adequate access    for future maintenance, inspection, and chamber cleaning   .

7.  Medium Compatibility and Purity: The process medium must not contain solid impurities or magnetic particles. These can cause float sticking/jamming, damage to the float or chamber , and lead to measurement errors or gauge failure. Note: This is primarily a pre-installation selection/verification requirement, but crucial for successful operation post-installation.

Conclusion:   

While seemingly straightforward, MLG installation involves multiple critical technical details. Strict adherence to these requirements is essential for long-term, stable, and accurate operation. Neglecting any detail can compromise measurement results or damage the instrument.

Therefore, before installation:   

Thoroughly understand the process medium characteristics,environmental conditions , and specific installation requirements   .

Consult with qualified instrumentation personnel if necessary to ensure optimal gauge performance.