VEGA VEGAPULS 63 (≥ 2.0.0 - ≤ 3.8) Foundation Fieldbus - Manual (Page 52)

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, storage and transport temperature -40 … +80 °C (-40 … +176 °F)
Process conditions
For the pressure stages of the vessel pressure, you also have to note the specifications on the type
label. Always the lowest value is applicable.
Pressure stage, depending on the process fitting
-
Bolting according to DIN 11851 and
11864-2, hygienic fitting LA and LB PN 16
vessel pressure depending on the process fitting
-
flange up to 2" (from 300 lb)/DN 50 -100 … 1600 kPa/-1 … 16 bar (-14.5 … 232 psig)
-
Flange from 3" (from 300 lb), DN 80 -20 … 1600 kPa/-0.2 … 16 bar (-2.9 … 232 psig)
-
Tuchenhagen Varivent -100 … 1000 kPa/-1 … 10 bar (-14.5 … 145 psig)
-
SMS -100 … 600 kPa/-1 … 6 bar (-14.5 … 87 psig)
Vessel pressure relating to the flange nom-
inal stage see supplementary instructions manual "Flanges
according to DIN-EN-ASME-JIS"
Process temperature, depending on the material of the antenna encapsulation (measured on the
process fitting)
-
TFM-PTFE encapsulated -40 … +150 °C (-40 … +302 °F)
-
TFM-PTFE encapsulated (low temper-
ature version)
9)
-170 … +150 °C (-274 … +302 °F)
-
PFA encapsulated -40 … +150 °C (-40 … +302 °F)
9) Not suitable for SIL applications.
52 VEGAPULS 63 • Foundation Fieldbus
10 Annex
28451
-EN
-120530