VEGA VEGAPULS 62 (≥ 2.0.0 - ≥ 4.0.0) 4 … 20 mA_HART - two-wire, approval according to LPR radio standard - Manual (Page 70)

Specifications apply also to the current output
Temperature drift - Current output ± 0.03 %/10 K relating to the 16 mA span max.
± 0.3 %
Deviation on the current output by analogue/
digital conversion <± 15 µA
Deviation on the current output by strong,
high frequency electromagnetic fields within
EN
61326
<± 150 µA
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.
The following table shows the resulting deviation for some typical gases and vapours. The
specified values refer to the distance. Positive values mean that the measured distance is too
large, negative values that the measured distance is too small.
Gas phase Temperature Pressure
1 bar/
14 .5 psig
10 bar/
145 psig
50 bar/
725 psig
100 bar/
1450 psig
200 bar/
2900 psig
Air 20 °C/68 °F 0.00 % 0.22 % 1.2 % 2.4 % 4.9 %
200 °C/392 °F -0.01 % 0.13 % 0.74 % 1.5 % 3.0 %
400 °C/752 °F -0.02 % 0.08 % 0.52 % 1.1 % 2.1 %
Hydrogen 20 °C/68 °F -0.01 % 0.10 % 0.61 % 1.2 % 2.5 %
200 °C/392 °F -0.02 % 0.05 % 0.37 % 0.76 % 1.6 %
400 °C/752 °F -0.02 % 0.03 % 0.25 % 0.53 % 1.1 %
Steam (satura-
ted steam) 100 °C/212 °F 0.26 % - - - -
180 °C/356 °F 0.17 % 2.1 % - - -
264 °C/507 °F 0.12 % 1.44 % 9.2 % - -
366 °C/691 °F 0.07 % 1.01 % 5.7 % 13.2 % 76.0 %
Characteristics and performance data
Frequency K-band (26 GHz technology)
Measuring cycle time 450 ms
Step response time 2) ≤ 3 s
2) Time span after a sudden measuring distance change by max. 0.5 m in
liquid applications, max 2 m with bulk solids applications, until the output
signal has taken for the first time 90 % of the final value (IEC 61298-2).
70 VEGAPULS 62 • 4 … 20 mA/HART - two-wire, approval according to LPR radio standard
11 Supplement
41718
-EN
-120301