Vega VEGAPULS 62 Operating Instructions Manual page 64

Supplement
1.574 in
0.118 in
- 0.118 in
- 1.574 in
Fig. 43: Deviation VEGAPULS 62 with parabolic antenna and 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 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
200 °C/392 °F
Hydrogen
100 °C/212 °F
Water (saturated
steam)
180 °C/356 °F
Water (saturated
steam)
Ambient conditions
Ambient, storage and transport
temperature
64
6.562 ft
0.03 %/10 K
1 bar/14.5 psi
0.00 %
0.00 %
-0.01 %
-0.02 %
0.20 %
-
-40 ... +80 °C (-40 ... +176 °F)
Relating to the nominal measuring range.
6)
98.43 ft
6)
10 bar/145 psi 50 bar/725 psi
0.22 % 1.2 %
0.13 % 0.74 %
0.10 % 0.61 %
0.05 % 0.37 %
- -
2.1 %
-
VEGAPULS 62 • 4 ... 20 mA/HART