G
auge pressure in the vessel does not in
fl
uence
VEGASON
63
.
L
ow pressure or vacuum does
,
however
,
damp the
ultrasonic pulses
.
T
his in
fl
uences the measuring result
,
particularly if the level is very low
.
W
ith pressures under
-
0
.
2
bar
(-
20
k
P
a
)
you should use a di
ff
erent measuring
principle
,
e
.
g
.
radar or guided microwave
.
4
.
2
M
ounting instructions
W
hen mounting
VEGASON
63
,
keep a distance of at least
200
mm to the vessel wall
.
I
f the sensor is installed in the
center of dished or spherical vessel tops
,
multiple echoes can
arise
.
T
hese can
,
however
,
be faded out by an appropriate
adjustment
(
see
"
S
etup
"
).
I
f you cannot keep this distance you should carry out a false
echo memory before setup
.
T
his applies mainly if buildup is
expected on the vessel wall
.
I
n this case
,
we recommend to
repeat a false echo memory later with existing buildup
.
1
2
> 200 mm
F
ig
.
5
:
M
ounting on round vessel tops
1
R
eference plane
2
V
essel center or symmetry axis
I
n vessels with conical bottom it can be advantageous to
mount the sensor in the center of the vessel
,
as measurement
is then possible down to the lowest point of the vessel bottom
.
P
ressure
/
V
acuum
I
nstallation position
VEGASON
63
-
4
...
20
m
A
/
HART
15
M
ounting
28777
-
EN
-
070507
