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Reference Manual
IP2048/RM, Rev AA
Section 3: Installation
February 2015
Figure 3-1. Min And Max Distances From Tank Wall
A. Transmitter is mounted vertically (maximum deviation of 3°).
B. Use a non-metallic fitting or flange.
C. 6° beam half angle
D. 1.3 in./ft. (11 cm/m). Minimum of 12 in. (0.3 m).
3.3.1 Consider the liquid surface conditions
Guidelines
1. Foaming liquids can reduce the size of the returned echo because foam is a poor
ultrasonic reflector.
Mount an ultrasonic transmitter over an area of clear liquid, such as near the inlet to a
tank or well. In extreme conditions, or where this is not possible, the transmitter may
be mounted in a vented stilling tube provided that the inside measurement of the
stilling tube is at least 4 in. (100 mm) and is smooth and free from joints or protrusions.
It is important that the bottom of the stilling tube stays covered to prevent the ingress
of foams.
2. Avoid mounting the transmitter directly over any inlet stream.
3.3.2 In-tank effects
Guidelines
1. Stirrers or agitators can cause a vortex. Mount the transmitter off-center of any vortex
to maximize the return echo.
2. If stirrer blades become uncovered, they create echoes as they pass through the
ultrasonic beam. The transmitter can learn to ignore these false echoes (see page 56 or
page 93 for further information).
A
D
B
C