R
eference conditions to measuring accuracy
(
similar to
DIN EN
60770
-
1
)
R
eference conditions according to
DIN EN
61298
-
1
-
T
emperature
+
18
…
+
30
°
C
(
+
64
…
+
86
°
F
)
-
R
elative humidity
45
…
75
%
-
A
ir pressure
860
…
1060
mbar
/
86
…
106
k
P
a
(
12
.
5
…
15
.
4
psig
)
O
ther reference conditions
-
R
e
fl
ector
ideal re
fl
ector
,
e
.
g
.
metal plate
2
x
2
m
(
6
.
56
x
6
.
56
ft
)
-
F
alse re
fl
ections
B
iggest false echo
,
20
d
B
smaller than the useful
echo
M
easuring characteristics
U
ltrasonic frequency
70
k
H
z
I
nterval
>
2
s
(
dependent on the parameter adjustment
)
B
eam angle at
3
d
B
11
°
S
tep response or adjustment time
5
)
>
3
s
(
dependent on the parameter adjustment
)
M
easuring accuracy
R
esolution
,
general
>
1
mm
(
0
.
039
in
)
D
eviation
6
)
see diagram
5 m (16.404 ft)
4 m (13.123 ft)
3 m (9.843 ft)
2 m (6.562 ft)
1 m (3.28 ft)
10 mm (0.394 in)
4 mm (0.157 in)
-10 mm (-0.394 in)
-4 mm (-0.157 in)
F
ig
.
25
:
D
eviation
VEGASON
61
I
n
fl
uence of the ambient temperature to the sensor electronics
7
)
A
verage temperature coe
ffi
cient of the zero
signal
(
temperature error
)
0
.
06
%
/
10
K
5
)
T
ime to output the correct level
(
with max
.
10
%
deviation
)
after a sudden
level change
.
6
)
I
ncl
.
non
-
linearity
,
hysteresis and non
-
repeatability
.
7
)
R
elating to the nominal measuring range
.
VEGASON
61
•
4
…
20
m
A
/
HART
four
-
wire
45
10
S
upplement
28778
-
EN
-
081127
