Vega VEGAPULS 68 - Page 75

75
11 Supplement
VEGAPULS 68 • Foundation Fieldbus
36538-EN-170405
Ʋ ø 95 mm (3.74 in) up to 50 m (164 ft)
Ʋ Parabolic antenna up to 75 m (246.1 ft)
Output variable
Output
Ʋ Signal digital output signal, Foundation Fieldbus protocol
Ʋ Physical layer according to IEC 61158-2
Damping (63 % of the input variable) 0 … 999 s, adjustable
Channel Numbers
Ʋ Channel 1 Process value
Ʋ Channel 8 Electronics temperature
Transmission rate
31.25 Kbit/s
Current value
Ʋ Non-Ex and Ex ia instrument 12 mA, ±0.5 mA
Ʋ Ex-d-ia instruments 16 mA, ±0.5 mA
Resolution, digital > 1 mm (0.039 in)
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 Reector Flatplatereector
Ʋ Falsereections 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. 56: Deviation under reference conditions
1 Reference plane
2 Antenna edge
3 Recommended measuring range
Repeatability ≤±1mm