VEGA VEGAPULS 68 (≥ 2.0.0 - ≤ 3.8) 4 … 20 mA_HART two-wire User Manual
Page 57
HART
output values
-
HART
value (Primary Value)
D
istance to the level
-
HART
value (Secondary Value)
D
istance to the level - scaled
S
ignal resolution
1.6 µA
F
ailure signal current output (adjustable)
mA-value unchanged 20.5 mA, 22 mA, < 3.6 mA
(
adjustable)
M
ax. output current
22
mA
L
oad
see load diagram under Power supply
D
amping (63 % of the input variable)
0 … 999
s, adjustable
F
ulfilled NAMUR recommendations
NE
43
Input variable
M
easured value
distance between process fitting and product sur-
face
M
ax. measuring range
70
m (229.7 ft)
M
in. distance from antenna end
400
mm (15.75 in)
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
-
F
alse reflections
B
iggest false echo, 20 dB smaller than the useful
echo
Characteristics and performance data
F
requency
K-
band
I
nterval
approx. 1 s
B
eam angle -3 dB with horn antenna, depending on antenna diameter
-
ø
40
mm (1.575 in)
22°
-
ø
48
mm (1.89 in)
18°
-
ø
75
mm (2.953 in)
10°
-
ø
95
mm (3.74 in)
8°
B
eam angle -3 dB with parabolic antenna
4°
S
tep response or adjustment time
3)
>
1
s (dependent on the parameter setting)
3)
T
ime to output the correct level (with max. 10 % deviation) after a sudden
level change.
VEGAPULS
68 • 4 … 20
mA/HART two-wire
57
10 S
upplement
29261
-EN
-090305