VEGA VEGAPULS 62 (≥ 2.0.0 - ≤ 3.8) 4 … 20 mA_HART two-wire - Manual (Page 59)

Influence of the ambient temperature to the sensor electronics 5)
A verage temperature coefficient of the zero
signal (temperature error)
0.03 %/10 K
Influence of the superimposed gas and pressure to the accuracy
T he 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.
T
he 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
A ir/Nitrogen 20 °C/68 °F 0.00 % 0.22 % 1.2 %
A ir/Nitrogen 200 °C/392 °F 0.00 % 0.13 % 0.74 %
H ydrogen 20 °C/68 °F -0.01 % 0.10 % 0.61 %
H ydrogen 200 °C/392 °F -0.02 % 0.05 % 0.37 %
W ater (saturated
steam)
100 °C/212 °F 0.20 % - -
W ater (saturated
steam)
180 °C/356 °F - 2.1 % -
Ambient conditions
A mbient, storage and transport temperature -40 … +80 °C (-40 … +176 °F)
Process conditions
P rocess temperature (measured on the process fitting), depending on seal and antenna system
-
FKM (V iton) -40 … +130 °C (-40 … +266 °F)
-
FFKM (K alrez 6375) -20 … +130 °C (-4 … +266 °F)
-
FKM (V iton) with temperature adapter -40 … +200 °C (-40 … +392 °F)
-
FFKM (K
alrez 6375) with temperature
adapter
-20 … +200 °C (-4 … +392 °F)
-
FFKM (K alrez 2035, 6230) (FDA) -15 … +130 °C (+5 … +266 °F)
-
FFKM (K
alrez 2035, 6230) (FDA) with
temperature adapter
-15 … +200 °C (+5 … +392 °F)
-
FKM (V iton) with impedance cone PP -40 … +80 °C (-40 … +176 °F)
-
FFKM (K alrez 6375) with impedance
cone PP
-15 … +80 °C (+5 … +176 °F)
F or the vessel pressure, you also have to note the specifications on the type label. Always the
lowest value is applicable.
5) R elating to the nominal measuring range, in the temperature range
-40 … +80 °C .
VEGAPULS 62 • 4 … 20 mA/HART two-wire 59
10 S upplement
28435
-EN
-090305