VEGA VEGAPULS 66 (≥ 2.0.0 - ≥ 4.0.0) 4 … 20 mA_HART - two-wire User Manual
Page 64
64
11 Supplement
VEGAPULS 66 • 4 … 20 mA/HART - two-wire
36519-EN-121011
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 (satu-
rated 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
Measuring frequency
C-band (6 GHz technology)
Measuring cycle time approx.
350 ms
Step response time
2)
≤ 3 s
Tracking speed of the measuring window
max.
1 m/min
Beam angle
3)
dependent on the antenna system
Ʋ without horn antenna
38°
Ʋ ø 75 mm (2.953 in)
38°
Ʋ ø 96 mm (3.78 in)
30°
Ʋ ø 146 mm (5.748 in)
20°
Ʋ ø 196 mm (7.717 in)
17°
Ʋ ø 242 mm (9.528 in)
14°
Emitted HF power (depending on the parameter adjustment)
4)
Ʋ Average spectral transmission power
density
-31 dBm/MHz EIRP
Ʋ Max. spectral transmission power
density
+24 dBm/50 MHz EIRP
Ʋ Specific absorption rate (SAR)
0.47 mW/kg
Ambient conditions
Ambient, storage and transport tempera-
ture
-40 … +80 °C (-40 … +176 °F)
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).
3)
Outside the specified beam angle, the energy of the radar signal has a level which is reduced by 50 % (-3 dB)
4)
EIRP: Equivalent Isotropic Radiated Power