FW Murphy MLS Series - Installation with a Weld Collar; Installation Using FW Murphy External Float Chamber

Section 15 00-02-0730
2019-01-15 - 4 -
Installation with a Weld Collar
 The weld collar, P/N 15050375, must be welded into the wall of the
pressure vessel according to code standards and good welding
practices.
 Follow above instructions for installation directly into the wall of the
pressure vessel.
NOTE: Weld collar 15050375 is not recommended with
a 1-inch float extension.
Installation Using FW Murphy External Float Chamber
 Install the FW Murphy float chamber 15051098 or 15700799 on the outside wall of the
pressure vessel using 1” NPT piping. Position the 2-inch NPT threaded connection at the
height where you want the level switch to operate. The 2-inch NPT threaded connection
must be positioned away from the tank wall.
NOTE: If using Float Chamber 15051098,
best practices recommend a surface mount
installation.
 A tee and bleed valve are typically installed at the
bottom of the lower 1-inch pipe riser to allow draining
of the float chamber for servicing or replacement.
NOTE: A typical installation with blocking
and bleed valves is shown at right.
 Install the MLS-020 in the 2-inch NPT connection of
the float chamber. BE SURE float travel is not
restricted and that the float is tight onto the counter-
balance.
 To complete the installation and wiring, follow the
instructions for mounting directly into wall of the vessel
and for wiring.