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23
Reference Manual
00809-0100-4811, Rev DA
Section 3: Installation
January 2015
Installation
Flange connection on nozzles
Figure 3-3. Mounting in Nozzles
The transmitter can be mounted in nozzles by using an appropriate flange. It is recommended
that the nozzle size is within the dimensions given in Tab le 3- 4. 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. By setting the UNZ equal to the nozzle height, the impact on the measurement
due to interfering echoes from the nozzle will be reduced to a minimum. See also “Disturbances
at the top of the tank” on page 102. Amplitude Threshold adjustments may also be needed in
this case.
Note
Except for the coaxial probe, the probe must not be in contact with the nozzle.
Table 3-4. Minimum Nozzle Diameter D1/D2 and Maximum Nozzle Height H (in./mm)
Rigid twin lead Flexible twin lead Coaxial Single lead
Flexible
single
D1
(1)
(1) UNZ = 0.
4/100 4/100 > Probe diameter 6/150 6/150
D2
(2)
(2) UNZ > 0.
2/50 2/50 > Probe diameter
2/50
(3)
1.5/38
(4)
(3) Process connection 1.5 in. (37.5 mm).
(4) Process connection 1 in. (25 mm).
2/50
H
(5)
(5) Recommended maximum nozzle height. For coaxial probes, there is no limitation on nozzle height.
4/100 + D
(6)
(6) Nozzle diameter.
4/100 + D
(6)
N/A 4/100 + D
(6)
4/100 + D
(6)
(7)
(7) For tall nozzles, the Long Stud version is recommended (Option Code: LS).
H
D2 = min. diameter with Upper Null
Zone (UNZ) adjustment
H
UNZ
Avoid nozzles
with reducer
D1 = min. diameter
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