Vega VEGAPULS 62 Operating Instructions Manual page 24

Mounting
Measurement in the
standpipe (surge or by-
pass tube)
24
VEGAFLEX sensors with guided microwaves are not influ-
enced by foam generation and are particularly suitable for such
applications.
By using a standpipe, the influence of vessel installations and
turbulence can be excluded. Under these prerequisites, the
measurement of products with low dielectric values (from DK
value 1.6) is possible.
Note:
Measurement in a standpipe is not recommended for very
adhesive products.
Surge or bypass tubes must extend all the way down to the
requested min. level, as measurement is only possible within
the tube.
Surge pipe
Make sure you provide the necessary upper vent hole in the
surge pipe. The hole must be aligned so that it and the
polarisation marking on the sensor are in the same plane (see
illustration: "Pipe antenna system in a tank").
Fig. 14: Pipe antenna system in a tank. The vent hole in the surge pipe must be
in one plane with the polarisation marking on the sensor.
1
Marking of the polarisation direction
2 Vent holde max. ø 5 mm (0.2 in)
If possible, the antenna diameter of the sensor should
correspond to the inner diameter of the tube. With VEGAPULS
62 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).
max.
1
2
min.
VEGAPULS 62 • 4 ... 20 mA/HART