73
11 Supplement
VEGAPULS SR 68 • 4 … 20 mA/HART - two-wire
38294-EN-160707
Signal resolution
0.3 µA
Resolution, digital
< 1 mm (0.039 in)
Failure signal current output (adjustable) mA-value unchanged 20.5 mA, 22 mA, < 3.6 mA
Max. output current
22 mA
Starting current
≤ 3.6 mA; ≤ 10 mA for 5 ms after switching on
Load
see load diagram under Power supply
Damping (63 % of the input variable),
adjustable
0 … 999 s
HART output values according to HART 7.0
2)
Ʋ
PV (Primary Value)
Distance
Ʋ
SV (Secondary Value)
Percent
Ʋ
TV (Third Value)
Lin. percent
Ʋ
QV (Fourth Value)
Scaled
Fulfilled HART specification
7.0
Further information on Manufacturer ID,
Device ID, Device Revision
See website of HART Communication Foundation
Accuracy (according to DIN EN 60770-1)
Process reference conditions according to DIN EN 61298-1
Ʋ
Temperature
+18 … +30 °C (+64 … +86 °F)
Ʋ
Relative humidity
45 … 75 %
Ʋ
Air pressure
860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psig)
Installation reference conditions
Ʋ
Min. distance to internal installations > 200 mm (7.874 in)
Ʋ Reflector
Flat plate reflector
Ʋ False reflections
Biggest false signal, 20 dB smaller than the useful signal
Deviation with liquids
See following diagrams
1,0 m (3.28 ft)
10 mm (0.394 in)
2 mm (0.079 in)
- 2 mm (- 0.079 in)
- 10 mm (- 0.394 in)
0
1 2
3
Fig. 55: Deviation under reference conditions
1 Reference plane
2 Antenna edge
3 Recommended measuring range
2)
Default values can be assigned individually