Burkert 8137 Manuel D'instructions page 19

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LEVEL TRANSMITTER 8137 • 4 ... 20 mA/HART
Fig. 14: Pipe antenna systems in a tank
1 Marking of the polarisation direction
Vent holde max. ø 5 mm (0.2 in)
2
If possible, the antenna diameter of the sensor should correspond to
the inner diameter of the tube. With LEVEL TRANSMITTER 8137 this
is approx. 40 mm (1.575 in). The sensor can be used with tube
diameters between 40 ... 80 mm (1.575 ... 3.15 in).
Make sure you provide the necessary upper vent hole in the surge
pipe, which must be displaced by 90° to the polarisation marking on
the sensor (see illustration: "Pipe antenna system in a tank").
As an alternative to the surge pipe in the vessel, a pipe system can be
mounted outside of the vessel as a bypass tube. For setup, select the
function "Bypass tube".
Align the sensor in such a way that the polarisation marking on the
process fitting is displaced by 90° to the tube holes or the tube
connection openings (see illustration: "LEVEL TRANSMITTER 8137 in
a bypass tube").
max.
1
2
min.
4 Mounting
19