VEGA VEGAPULS 66 (≥ 2.0.0 - ≤ 3.8) enamel Profibus PA - Manual (Page 51)

Influence of the ambient temperature to the sensor electronics 8)
Average temperature coefficient of the zero
signal (temperature error) 0.03 %/10 K
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 1 bar/14.5 psig 10 bar/145 psig 50 bar/725 psig
Air/Nitrogen 20 °C/68 °F 0.00 % 0.22 % 1.2 %
Air/Nitrogen 200 °C/392 °F 0.00 % 0.13 % 0.74 %
Hydrogen 20 °C/68 °F -0.01 % 0.10 % 0.61 %
Hydrogen 200 °C/392 °F -0.02 % 0.05 % 0.37 %
Water (saturated
steam) 100 °C/212 °F 0.20 % - -
Water (saturated
steam) 180 °C/356 °F - 2.1 % -
Ambient conditions
Ambient temperature (note temperature derating!), storage and transport temperature
-
Standard version -40 … +80 °C (-40 … +176 °F)
-
Versions IP 66/IP 68, 1 bar and IP 68, PE
connection cable -20 … +60 °C (-4 … +140 °F)
-
Versions IP 66/IP 68, 1 bar and IP 68,
PUR connection cable -20 … +80 °C (-4 … +176 °F)
50°C
(122°F)
80°C
(176°F)
150°C
(302°F)
200°C
(392°F)
T
Proz
T
u
Fig. 32: Temperature derating VEGAPULS 66 enamel without indicating and adjustment module
8) Relating to the nominal measuring range, in the temperature range
-40 … +80 °C .
VEGAPULS 66 enamel • Profibus PA 51
10 Supplement
33335
-EN
-090305