Kenco Engineering Magna-Site Magnetic Level - Manual (Page 3)

Note: Proper bolting procedures should be followed,
including correct torquing patterns and values. Before putting
the Magna-Site into service, verify that the Gauge Housing
Chamber is sealed with no openings to the atmosphere.
Putting the Magna-Site into Service:
After verifying that the Gauge Housing Chamber is sealed with no openings
to the atmosphere, open (slowly) the upper process tank connection to the
Gauge Housing Chamber before opening (slowly) the lower connection. By
opening the upper connection first, the float is held down while the
pressure is equalized between the process tank and the Magna-Site. If the
lower connection is opened first, the float is more likely to be launched
upward, possibly damaging the float and housing.
Once the upper and lower connections are opened, inspect to verify that
the system is sealed (no leaks) and that the fluid level flags are operational.
The installation is now complete.