Emerson Process Management ROSEMOUNT 5300 - Manual (Page 34)

Reference Manual
00809-0100-4530, Rev BA
July 2009
Rosemount 5300 Series
3-4
The transmitter can be mounted in nozzles by using an appropriate flange.
The nozzle sizes given in Table 3-1 show the recommended dimensions. For
small nozzles, it may be necessary to increase the Upper Null Zone (UNZ) to
reduce the measuring range in the upper part of the tank. Amplitude
Threshold adjustments may also be needed in this case. A Trim Near Zone is
recommended in most nozzle installations, for example, when there are
disturbing obstacles in the near zone. See Appendix C: Handling of
Disturbances from Nozzle on page C-4.
NOTE!
The probe should not contact the nozzle, with the exception of the Coaxial
Probe. If the nozzle diameter is less than recommended, the measuring range
may be reduced.
Table 3-1. Nozzle
considerations
Single (Rigid/Flexible) Coaxial Twin (Rigid/Flexible)
Recommended
Nozzle Diameter (D)
6 in. (150 mm) > Probe Diameter 4 in. (100 mm)
Minimum Nozzle
Diameter (D)
(1)
(1) The Trim Near Zone function may be necessary or an Upper Null Zone setup may be required to mask
the nozzle.
2 in. (50 mm) > Probe Diameter 2 in. (50 mm)
Recommended
Nozzle Height (H)
(2)
(2) Longer nozzles may be used in certain applications. Consult your local Emerson Process
Management representative for details.
4 in. + Nozzle Diameter (3)
(3) When using single flexible probes in tall nozzles, it is recommended to use the Long Stud (LS).
N/A
4 in. + Nozzle
Diameter