Siemens SITRANS LG250 Operating Instructions Manual

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72 PBD-51041387SITRANS LG250 - Operating Instructions46200-EN-160517Additional deviation through electromag-netic interference acc. to EN 61326< ±10 mm (< ±0.394 in)Specifications apply also to the current output8)Temperature drift - Current output ±0.03 %/10 K relating to the 16 mA span max. ±0.3 %Deviation on the current output through analogue/digital conversionƲ Non-Ex and Ex-ia version < ±15 μAƲ Ex-d-ia version < ±40 μAAdditional deviation through electromag-netic interference acc. to EN 61326< ±150 μAInfluence of the superimposed gas and pressure to the accuracyThe propagation speed of the radar impulses in gas or vapour above the medium is reduced byhigh pressure. This effect depends on the superimposed gas or vapours.The following table shows the resulting deviation for some typical gases and vapours. The specifiedvalues refer to the distance. Positive values mean that the measured distance is too large, negativevalues that the measured distance is too small.Gas phase Temperature Pressure1 bar (14.5 psig) 10 bar (145 psig) 50 bar (725 psig)Air 20 °C (68 °F) 0 % 0.22 % 1.2 %200 °C (392 °F) -0.01 % 0.13 % 0.74 %400 °C (752 °F) -0.02 % 0.08 % 0.52 %Hydrogen 20 °C (68 °F) -0.01 % 0.1 % 0.61 %200 °C (392 °F) -0.02 % 0.05 % 0.37 %400 °C (752 °F) -0.02 % 0.03 % 0.25 %Steam (saturatedsteam)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 %Characteristics and performance dataMeasuring cycle time < 500 msStep response time9) ≤ 3 sMax. filling/emptying speed 1 m/minProducts with high dielectric constant (>10) up to 5 m/min.Ambient conditionsAmbient, storage and transport tempera-ture-40 … +80 °C (-40 … +176 °F)8) Also for the additional current output (optional)9) Time span after a sudden measuring distance change by max. 0.5 m in liquid applications, max 2 m with bulksolids applications, until the output signal has taken for the first time 90 % of the final value (IEC 61298-2).