VEGA VEGASON 65 Foundation Fieldbus - Manual (Page 50)

Input variable
M easured value
-
V ersion A distance between lower edge of the flange and
product surface
-
version B, C and D distance between lower edge of the transducer and
product surface
D ead band 0.8 m (2.624 ft)
M
easuring range
-
L iquids up to 45 m (147.6 ft)
-
B ulk solids up to 25 m (82.02 ft)
Reference 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 kPa (12.5 … 15.4 psig)
O ther reference conditions
-
R eflector ideal reflector, e.g. metal plate 2 x 2 m (6.56 x 6.56 ft)
-
F alse reflections B iggest false echo, 20 dB smaller than the useful
echo
Measuring characteristics
U ltrasonic frequency 18 kHz
I nterval > 2 s (dependent on the parameter adjustment)
B eam angle at 3 dB 5°
A djustment time 6) > 3 s (dependent on the parameter adjustment)
Measuring accuracy
R esolution, general > 1 mm (0.039 in)
D eviation 7) see diagram
6) T ime to output the correct level (with max. 10 % deviation) after a sudden
level change.
7) I ncl. non-linearity, hysteresis and non-repeatability.
50 VEGASON 65 • F oundation Fieldbus
10 S upplement
28794
-EN
-081127