Vega VEGABAR 82 Operating Instructions Manual

Also see for VEGABAR 81: Operating instructions Operating instructions Quick setup guide Operating instructions Quick setup guide

Contents

6510 SupplementVEGABAR 82 • Slave sensor for electronic differential pressure48046-EN-190320• Fperf: Basic deviation• Fstab: Long-term stability• FT: Thermal change of zero signal and output span (temperature error)• FKl: Deviation• Fa: Thermal change of the current output• FMZ: Additional factor measuring cell version• FTD: Additional factor Turn down10.3 Practical exampleDataLevel measurement in a small vessel, 500 mm height corresponds to 0.049 bar (4.9 KPa), superim-posed pressure 0.35 bar (35 KPa), medium temperature 40 °CVEGABAR 82 Master and slave sensor each with nominal measuring range 0.4 bar (40 KPa), devia-tion < 0.1 %, process fitting G1½ (measuring cell ø 28 mm)The required values for the temperature error FT, deviation FKl and long-term stability Fstab are avail-able in the technical data.1. Calculation of the Turn downTD = 0.4 bar/0.049 bar, TD = 8.2 : 12. Determination temperature error FTThe temperature error FT consists of the basic temperature error FTBasis , the additional factor meas-uring cell FMZ and the additional factor Turn Down FTD.50(F TBasisFig. 35: Determination of the basic temperature error for the above example: FTBasis = 0.15 %Measuring cell version Measuring cell standard, depending on the accuracy class0.05 %, 0.1 % 0.2 % (0.1 barabs) 0.2 %Factor FMZ 1 2 3Tab. 13: Determination of the additional factor measuring cell for above example: FMZ = 1The additional factor FTD through Turn down is calculated according to the following formula:FTD = 0.5 x TD + 0.5, with TD = 8.2:1 of above calculationFTD = 0.5 x 8.2 + 0.5 = 4.6