VEGA VEGAPULS 68 (≥ 2.0.0 - ≤ 3.8) 4 … 20 mA_HART two-wire - 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