l
M
aterial metal
,
smoother inner tube
l
I
n case of an extremely rough tube inner surface
,
use an inserted
tube
(
tube in tube
)
or a radar sensor with tube antenna
l
F
langes are welded to the tube according to the orientation of the
polarisation level
l
G
ap size with junctions
≤
0
.
1
mm
,
for example
,
when using a ball
valve or intermediate
fl
anges with single pipe sections
l
T
he antenna diameter of the sensor should correspond to the
inner diameter of the tube
l
D
iameter should be constant over the complete length
I
nstruments for a temperature range up to
250
°
C
or up to
450
°
C
have
a distance piece between process
fi
tting and electronics housing
.
T
hs
distance piece is used for thermal decoupling of the electronics
against high process temperatures
.
I
nformation
:
T
he distance piece must only be incorporaed up to max
.
50
mm in the
vessel installation
.
O
nly then
,
a reliable temperature decoupling is
guaranteed
.
ma
x.
5
0
mm
(1
.9
7
")
1
2
3
F
ig
.
15
:
M
ounting of the instrument with insulated vessels
.
1
E
lectronics housing
2
D
istance piece
3
V
essel insulation
T
he short examples give you introductory information on the
fl
ow
measurement
.
D
etailed planning information is available from
fl
ume
manufacturers and in special literature
.
M
ounting in the vessel
insulation
F
low measurement with
rectangular
fl
ume
22
VEGAPULS
62
•
4
…
20
m
A
/
HART
two
-
wire
4
M
ounting
36503
-
EN
-
100607
