VEGA VEGAPULS 51K…54K 4 … 20 mA; HART compact sensor - Manual (Page 18)

18 VEGAPULS 51K … 54K
21750-EN-031222
Mounting and installation
Standpipe measurement of inhomoge-
neous products
If you want to measure inhomogeneous or
stratified products in a surge pipe, it must
have holes, elongated holes or slots. These
openings ensure that the liquid is mixed and
corresponds to the liquid in the vessel.
The more inhomogeneous the measured
product, the closer the openings should be
spaced.
Due to radar signal polarisation, the holes or
slots must be positioned in two rows offset
by 180°. The radar sensor must then be
mounted so that the type label of the sensor
is aligned with the rows of holes.
ш 5...10
ш 5...10
Openings in a surge pipe for mixing of inhomogene-
ous products
slightly inhomogeneous
liquids
inhomogeneous liquids
homogeneous
liquids
ø 5...10
VEGAPULS 54: Row of holes in one axis with the type
label
Type label
Flange connections on bypass tubes
Every wider slot causes a false echo. The
slots should therefore not exceed a width of
10 mm in order to keep the signal noise level
to a minimum. Round slot ends are better
than rectangular ones.