Measuring Gas Velocity with the D-FL 100 Differential Pressure Bar

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D−FL 100 Seite 4placed on the differential pressure bar at different distances from the center of the duct/stack.Measurements are taken at all points simultaneously, and therefore the differential pressure is averagedright at the measuring points. The distance between the measuring points is calculated as follows:(Eq. 6)DabD Kindistance from the measuring point to theduct/stack wallduct/stack diameteri-fraction of partial surfacenumber of partial surfacesThe number of ring zones created is dependent on the diameter of the duct/stack. Five ring zones withten measuring points are usually sufficient. (Please consult VDI guidelines DIN 2066, sheet 1 or yourappropriate regulatory agency.)Fig. 3:Dividing the duct/stack cross section into equal ring surfacesGmbH
D−FL 100 Seite 5To prevent residue accumulation on the differential pressure bar, the gas should be clean. Ductscontaining high-particulate gases should be periodically purged with compressed air. By moving thelever in front of the differential pressure bar, each chamber can be purged separately (Fig. 4).Fig. 4:Possible settings of the switching valveCalculating the volume of gas flow also depends on the density of the gas (Eq. 1). To obtain an accuratecalculation, the contents of the gas and their molecular weights must be known (DIN 1952). No gaswatermixtures can be measured, because of condensates.Because it is directly affected by gas density fluctuations, velocity must be measured under operatingconditions. If a calculation for standard conditions is required, the D-FL 100-10 Display will take thestatic pressure and temperature into account. The gas density always depends more on temperaturethan on pressure, so the correction for absolute pressure can be neglected in most cases. Temperatureand pressure can be measured using additional sensors, and the results transferred to the D-FL 100-10Display.GmbH
Page 1 and 2: 11/07Measuring Gas Velocitywith the
Page 3 and 4: D-FL 100Table of Contents1. Applica
Page 5 and 6: D−FL 100 Seite 11. ApplicationOne
Page 7: D−FL 100 Seite 3The output signal
Page 11 and 12: D−FL 100 Seite 73.1. Differential
Page 13 and 14: D−FL 100 Seite 9If the differenti
Page 15 and 16: D−FL 100 Seite 114. Installation4
Page 17 and 18: D−FL 100 Seite 13Fig. 11:Installa
Page 19 and 20: D−FL 100 Seite 15Fig. 14:Connecti
Page 21 and 22: D−FL 100 Seite 17Fig. 16:Dimensio
Page 23 and 24: D−FL 100 Seite 19250 mm13538,5 18
Page 25 and 26: D−FL 100 Seite 215.2. Start-up of
Page 27 and 28: D−FL 100 Seite 235.3. Error Messa
Page 29 and 30: D−FL 100 Seite 258. Specification
Page 31 and 32: D−FL 100 Seite 27Fig. 20:Probe cr
Page 33 and 34: D−FL 100 Seite 299. Selecting the
Page 35 and 36: D−FL 100 Seite 319.3. Selecting t
Page 37 and 38: D−FL 100 Seite 33DescriptionHose
Page 39 and 40: D−FL 100 Seite 359.6. Illustratio
Page 41 and 42: D−FL 100 Seite 379.6.3. Mounting,
Page 43 and 44: D−FL 100 Seite 39Customer: XYZ da
Page 45 and 46: D−FL 100 Seite 41If we want to pu
Page 47 and 48: D−FL 100 Seite 4311. Measuring Po
Page 49 and 50: D−FL 100 Seite 45GEMEINSAMESMINIS
Page 51 and 52: D−FL 100 Seite 47EG-Konformitäts
Page 53: D-FL 100 Page 1GmbH · Kollaustraß

Measuring Gas Velocity with the D-FL 100 Differential Pressure Bar

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