Mounting Considerations - Emerson Rosemount 3101 Quick Start Manual

Quick Start Guide
4.0

Mounting considerations

1. Mount the transmitter above the liquid using the 2-in. thread provided, but
no closer than 12 in. (0,3 m) to the surface. The transmitter does not detect
any liquid surface closer than 12 in. (0,3 m) to the transmitter face.
2. The transmitter should be mounted vertically to ensure a good echo from
the liquid surface. The beam half angle is 6 degrees (see
page
3. Obstructions in the tank, or well, may generate echoes which can be
confused with the real liquid surface echo. Obstructions within the beam
angle generate strong false echoes. Wherever possible, the transmitter
should be positioned to avoid false echoes.
4. To avoid detecting unwanted objects in the tank or well, it is advisable to
maintain a distance sideways of at least 1.3 in. from the center line of the
transmitter for every foot (11 cm per meter) range to the obstruction
(Figure 7 on page
5. No false echoes are generated if the transmitter is located near the side of
the tank or well on condition that the wall is smooth and free of protrusions.
However, there will still be a reduction in the echo size. It is recommended
that the transmitter be mounted no closer than 12 in. (0,3 m) to the wall to
avoid a large reduction in the echo size.
6. If the transmitter is mounted in an enclosed tank with a domed top, avoid
mounting the transmitter in the center of the tank roof because this could
act as a parabolic reflector and create unwanted echoes.
7. Avoid applications where heavy condensation could form on the transmitter
face.
8. If the transmitter is mounted in a stand-off or nozzle, the transmitter face
should protrude at least 0.2 in. (5 mm) into the tank.
9. If the transmitter is used in environments where direct sunlight can cause
high temperatures on exposed surfaces, a sun-shade is recommended.
6
11).
11).
September 2018
Figure 7 on