Vega VEGAPULS 63 Operating Instructions Manual page 54

Supplement
30 mm
15 mm
-15 mm
-30 mm
Fig. 32: Accuracy VEGAPULS 63 with increased sensitivity in mm, measuring range in m
1.180 in
0.590 in
- 0.590 in
- 1.180 in
Fig. 33: Accuracy VEGAPULS 63 with increased sensitivity in Inch, measuring range in ft
Influence of the ambient temperature to the sensor electronics
Average temperature coefficient of the
zero signal (temperature error)
Influence of superimposed gas and pressure to the accuracy
The spreading speed of radar impulses in gas or vapour above the measured product is
reduced by high pressures. This effect depends on the superimposed gas or vapour and is
very high in case of low temperatures. The following chart shows the resulting deviation for
some typical gases or vapours. The stated values relate to the distance. Positive values
mean that the measured distance is too high, negative values that the measured distance is
too small.
Gas phase
Air/Nitrogen
Air/Nitrogen
54
1,0 m
3.280 ft
Temperature 1 bar/14.5 psi
20 °C/68 °F 0.00 %
200 °C/392 °F 0.00 %
Relating to the nominal measuring range.
9)
0.03 %/10 K
10 bar/145 psi
0.22 %
0.13 %
VEGAPULS 63 - 4 ... 20 mA/HART
20 m
65.62 ft
9)
50 bar/725 psi
1.2 %
0.74 %