Emerson Rosemount 3100 Series, Reference Manual, Page: 24 / 144

Reference Manual
00809-0100-4840, Rev. BA
July 2008
Rosemount 3100 Series
3-8
In addition, when setting the bottom reference on a 'V' notch weir it is
important that the true invert of the weir is taken (Figure 3-6), and NOT the
meniscus liquid level that may be
1 /
8
in. (3 to 4 mm) above the true invert.
Figure 3-6. Bottom Reference of
‘V’ Notch Weir
NOTES:
• The liquid surface at the point of measurement must be stable, smooth,
and have a uniform approach velocity. It must not be affected by baffles,
foam, hydraulic jumps, or other object that may cause flow disruption.
• The primary element should be free from a situation where it is likely to
'drown' (refer to relevant Standard for further information.)
• The Rosemount 3100 Series has integral temperature compensation, and
must be protected at all times from direct sunlight and any radiated heat.
The Rosemount 3102 and Rosemount 3105 have the option of a Remote
Temperature Sensor for temperature compensation (see page 3-14.)
• For maximum accuracy and stability of the level measurement reading,
the transmitter should always be protected from direct sunlight.
• If the flow structure permits, mount the transmitter within the flow channel,
or in a chamber. (A chamber is also known as a bridle or cage.)
T
ran
smit
ter
b
o
tt
om
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e
True invert
Meniscus