Vega VEGAPULS 66 Operating Instructions Manual

Also see for VEGAPULS 62: Operating instructions Safety manual Quick setup guide Quick setup guide Operating instructions

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Vega VEGAPULS 66 Operating Instructions Manual Manual pdf 57 page image

5710 SupplementVEGAPULS 66 • 4 … 20 mA/HART - two-wire28438-EN-170927Deviation12) see diagrams1,0 m (3.28 ft) 35 m (114.8 ft)20 mm (0.788 in)10 mm (0.394 in)- 10 mm (- 0.394 in)- 20 mm (- 0.788 in)0Fig. 36: Deviation VEGAPULS 66Influence of the ambient temperature to the sensor electronics13)Average temperature coefficient of thezero signal (temperature error)0.03 %/10 KInfluence of the superimposed gas and pressure on measurement accuracyThe spreading speed of the radar impulses in gas or vapour above the product is reduced by highpressures. This effect depends on the superimposed gas or vapour and increases with low tem-peratures. The following table shows the deviation caused by some typical gases or vapours. Thestated 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 psigAir/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 (saturatedsteam)100 °C/212 °F 0.20 % - -Water (saturatedsteam)180 °C/356 °F - 2.1 % -Ambient conditionsAmbient, storage and transport tempera-ture-40 … +80 °C (-40 … +176 °F)Process conditionsFor the process temperature and the vessel pressure, you also have to note the specifications onthe type label! Always the lowest value is applicable!12) Incl. non-linearity, hysteresis and non-repeatability.13) Relating to the nominal measuring range, in the temperature range -40 … +80 °C .