Rosemount 5600 Series, Reference Manual

Page: 83 / 210

Reference Manual
00809-0100-4024, Rev BA
September 2005
4-3
Rosemount 5600 Series
ANTENNA
For the antenna a few choices are available. The type of antenna must always
be selected and, if applicable, corresponding type of tank sealing to be used.
User Defined is for non-standard antennas only.
The following parameters are used:
Hold Off Distance The (UNZ) defines how close to the transmitter’s reference point a
level value is accepted. Normally, the Hold Off Distance is set
automatically and does not need to be changed. However, if there
are disturbing echoes in the upper part of the tank, for example
from the tank nozzle, you can increase the Hold Off Distance in
order to avoid measurements in the region close to the antenna.
(See “Setting the Hold Off Distance” on page 2-39).
Pipe Inner Diameter The figure is used to compensate for the lower microwave
propagation speed inside the pipe. An incorrect value will give a
scale factor error. Only valid for pipe antennas or cone antennas in
existing still-pipe. If locally supplied still-pipes are used, make sure
the inner diameter is noted before installation of the pipe.
Tank Connection Length The (TCL) parameter is entered for antenna type User Defined
only. For standard antennas the TCL value is set automatically. For
the 500 mm extended cone use the TCL
ext
values in Table 4-2.
(See “Setting the Tank Connection Length (TCL)” on page 2-38).
Hold Off
Distance (UNZ)
5600/HOLDOF
F DIST
ANCE.TIF