Vega VEGAPULS 63 Operating Instructions Manual page 50

10 Supplement
30 mm
15 mm
-15 mm
-30 mm
1.180 in
0.590 in
- 0.590 in
- 1.180 in
Fig. 24: Deviation VEGAPULS 63 with increased sensitivity in mm, measuring range in m
Influence of the ambient temperature to the sensor electronics
Average temperature coefficient of the
zero signal (temperature error)
Influence of the superimposed gas and pressure to the accuracy
The spreading speed of the radar impulses in gas or vapour above the product is
reduced by high pressures. This effect depends on the superimposed gas or vapour
and increases with low temperatures. The following chart shows the deviation caused
by some typical gases or vapours. The stated values refer to the distance. Positive
values mean that the measured distance is too high, negative values that the measured
distance is too small.
Gas phase Temperature
20 °C/68 °F
Air/Nitrogen
200 °C/392 °F
Air/Nitrogen
20 °C/68 °F
Hydrogen
50
1,0 m
3.280 ft
0.03 %/10 K
1 bar/14.5 psig
0.00 %
0.00 %
-0.01 %
Relating to the nominal measuring range.
7)
10 bar/145 psig
0.22 %
0.13 %
0.10 %
VEGAPULS 63 • 4 ... 20 mA/HART - four-wire
20 m
65.62 ft
7)
50 bar/725 psig
1.2 %
0.74 %
0.61 %