VEGA VEGAPULS 63 (≥ 2.0.0 - ≤ 3.8) 4 … 20 mA_HART - two-wire - Manual (Page 18)

B
y using a standpipe, the influence of vessel installations and
turbulence can be excluded. Under these prerequisites, the meas-
urement of products with low dielectric figure (from 1.6) is possible.
S
urge or bypass tubes must extend all the way down to the requested
min. level, as measurement is only possible within the tube.
Surge pipe
M
ake 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").
max.
min.
2
1
Fig. 12: 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 hole max. ø 5 mm (0.2 in)
I f possible, the antenna diameter of the sensor should correspond to
the inner diameter of the tube. With VEGAPULS 63 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).
Bypass tube
A
s an alternative to the surge pipe in the vessel, a tube system outside
of the vessel is possible as a bypass tube. Select during setup the
function "Bypass tube".
A lign the sensor in such a way that the polarisation marking on the
process fitting is in the same plane as the tube holes or the tube
connection openings (see illustration: "VEGAPULS in a bypass tube").
Measurement in the
standpipe (surge or by-
pass tube)
18 VEGAPULS 63 • 4 … 20 mA/HART - two-wire
4 M ounting
28436
-EN
-120530