VEGA VEGAFLEX 86 Foundation Fieldbus Coax probe - Manual (Page 69)

69
11 Supplement
VEGAFLEX 86 • Foundation Fieldbus
44230-EN-130910
Max. deviation - Version with reference
distance
± 10 mm (0.39 in)
Deviating upper dead band - Version with
reference distance
450 mm (17.7 in)
L
0
-2 mm (-0.079 ")
2 mm (0.079 ")
-10 mm (-0.394 ")
5 mm (0.197 ")
-5 mm (-0.197 ")
0,15 m (5.906 " )
0,03 m (1.18 " ) 0,1 m
(3.937 ")
1
Fig. 40: Deviation VEGAFLEX 86 in coax version in water
1 Dead band - no measurement possible in this area
L Probe length
L
0
-2 mm (-0.079 ")
2 mm (0.079 ")
-10 mm (-0.394 ")
10 mm (0.394 ")
0,1 m (3.937 " )
0,05 m
(1.968 ")
0,1 m
(3.937 ")
0,25 m (9.842 " )
1 1
Fig. 41: Deviation VEGAFLEX 86 in coax version in oil
1 Dead band - no measurement possible in this area
L Probe length
Repeatability ≤ ±1 mm
Variables influencing measurement accuracy
Temperature drift - Digital output
±3 mm/10 K relating to the max. measuring range or
max. 10 mm (0.394 in)
Additional deviation through electromag-
netic interference acc. to EN 61326
< ±10 mm (< ±0.394 in)
Influence of the superimposed gas and pressure to the accuracy
The propagation speed of the radar impulses in gas or vapour above the medium is reduced by
high pressure. This effect depends on the superimposed gas or vapour and is especially large at
low temperatures.