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Siemens sitrans LR 400 Instruction Manual
Also see for SITRANS LR 400: Instruction manualInstruction manual and users guideInstruction manualInstruction manualQuick start manual
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Page 40 SITRANS LR 400 ñ INSTRUCTION MANUAL 7ML19985FH03Parameters (HART)4.2.2.3: Dead band (F = 0.4 m)Area below the flange in which measured values are ignoredSpecification of a dead band in the units system selected according to Parameter 4.1.5defines a minimum distance from the flange which the measuring medium must have forthe device to accept the measured values as valid. This suppresses reflectiveinterference generated by the nozzle, close obstacles, or the antenna.4.2.2.4: Correction Factor (F = 1.0)Correction factor for physical measuring influencesThe propagation time of the microwaves between the antenna and the measuringmedium changes slightly depending on the pressure inside the vessel. If this pressure isconstant, however, it can be included in the evaluation according to the equation:K = correction factor, p = pressure inside the vessel in bar, Tgas = gas temperature in ∞C,εr, Gas = dielectric of the overlying gas, e.g. ερ, air = 1.00059Enter the correction factorK as a dimensionless value.4.2.2.5: Filling Speed (F = 200 mm/min)Typical speed of change of the level. Not displayed if user vessel is selected in Parameter4.2.2.1.This parameter is not displayed when a user vessel is selected in Parameter 4.2.2.1. Whenyou determine that the displayed measured value does not follow the change in theheight of the level in the vessel, you can enter a value for the speed with which itgenerally changes. This assigns a greater probability to measuring targets which move atthis speed.Value numerical value, Minimum value = Length of the antennaValue numerical valueValue numerical valueNote: The dead band should exceed the antennaís length.K 11 εr Gas, 1ñ( )+ 273 p⋅T Gas 273+--------------------------⋅-------------------------------------------------------------------------= |
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