Blue Sea Systems VSM 422 Ultrasonic Tank
Sender PN 1810 is used for water, waste, and
diesel fuel tanks. Blue Sea Systems VSM 422
Ultrasonic Tank Sender PN 1811 is used for
When connecting the tank senders to ground, it is
important to connect them as directly as possible
to the main negative bus. Do not ground directly to
the fuel tank. This will prevent high loads such as
battery chargers from affecting the tank readings.
The Blue Sea Systems VSM 422 Ultrasonic Tank
Senders require an external power source. When
power to the sender is lost, the VSM 422 will read
the tank as full, and may trigger the tank?s high
NOTE: The gasket is designed to fit only one
way on the tank sender. Carefully note its
position and orientation with index hole aligned
with the electrical connections, and screw holes
precisely aligned with the mounting holes in the
sender. If the holes do not exactly align, flip
the gasket over. Ensure that the gasket is fully
seated in the sender recess.
1. An existing SAE 5 bolt pattern mounting hole
may be used to mount the tank sender.
Ideally, the sender should be located at least
3.00" (76.2mm) from any edge, baffle, dip tube
or other obstruction to avoid sound reflections.
If the tank has a tapering shape, the sender
should be mounted over the deepest part of
the tank. If the tank is rectangular, mount the
sender as close to the center of the top of the
tank as possible.
2. Before drilling for a new installation, place
rags, plastic film, or other material to prevent
any debris from entering the tank. Cut center
hole in tank. PN 1810 requires a 1-5/8" hole
saw and PN 1811 requires a 1-1/2" hole saw.
3. Using the sender as a template, mark and drill
the first mounting hole, and install a screw
to hold the sender in place. Mark and drill a
second hole as nearly opposite the first.
one as possible, and install a second screw.
Mark and drill the remaining holes.
4. When all holes are drilled, remove any rags
or plastic film placed to catch debris in step 2.
Carefully remove any loose debris, especially
if it might contaminate fuel or water systems.
Remove the screws, align the gasket on the
sender, and install the sender and gasket on
the tank. The use of #10 panhead screws
is recommended. Hand tighten the screws
firmly to a maximum torque of 15 in-lbs.