l
T
he measurement through a ball valve with complete run is
possible
C
onstructional requirements on the surge pipe
:
l
M
aterial metal
,
smoother inner tube
l
P
referably pultruded or straight beaded stainless steel tube
l
W
elded joint should be straight and lie in one axis with the holes
l
F
langes are welded to the tube according to the orientation of the
polarisation level
l
I
n case of a extension with a welding neck
fl
ange or pipe collar as
well as when a ball valve is used
,
the inner surfaces should be
aligned and accurately joined together
l
G
ap size with junctions
≤
0
.
1
mm
l
D
o not weld through the pipe wall
.
T
he surge pipe must remain
smooth inside
.
R
oughness and beads on the inside caused by
unintentional penetration should be removed since they cause
strong false echoes and encourage buildup
l
S
urge pipes must extend all the way down to the requested min
.
level
,
as measurement is only possible within the tube
.
l
D
iameter of holes
≤
5
mm
,
any number
OK
,
on one side or
completely through
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
A
n alternative to measurement in a surge pipe is measurement in a
bypass tube outside of the vessel
.
M
easurement in the by
-
pass
20
VEGAPULS
62
•
4
…
20
m
A
/
HART
two
-
wire
4
M
ounting
36503
-
EN
-
100607
