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Reference Manual
00809-0100-4530, Rev DD
May 2016
Low-low unit
The distance from flange to upper inlet must be at least 20 in. (500 mm). If this requirement
is not met, a spool piece can be added. When the requirement of 20 in. (500 mm) is met, an
Upper Null Zone (UNZ) of 14 in. (350 mm) must be configured, so that any disturbance in
the near zone above the upper inlet is ignored.
Figure 3-20. Low-Low Unit
3.3
Mounting
Mount the transmitter with flange on a nozzle on top of the tank. The transmitter can also
be mounted on a threaded connection. Make sure only qualified personnel perform the
installation.
Note
If you need to remove the transmitter head from the probe, make sure that the process seal
is carefully protected from dust and water. See
“Removing the transmitter head” on
for further information.
Note
PTFE covered probes must be handled carefully to prevent damage to the coating.
UNZ = 14 in. (350 mm)
Minimum
20 in. (500 mm)
20 mA
4 mA
Warning
Shutdown