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
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Page 4 and 5: D-FL 100IllustrationsFig. 1: Diagra
Page 6 and 7: D−FL 100 Seite 2Fig. 1:Diagram of
Page 10 and 11: D−FL 100 Seite 63. System Compone
Page 12 and 13: D−FL 100 Seite 83.2. Differential
Page 14 and 15: D−FL 100 Seite 10LED DisplayStand
Page 16 and 17: D−FL 100 Seite 12After the differ
Page 18 and 19: D−FL 100 Seite 144.3. Electrical
Page 20 and 21: D−FL 100 Seite 16Fig. 15:Connecti
Page 22 and 23: D−FL 100 Seite 18Fig. 17:Connecti
Page 24 and 25: D−FL 100 Seite 205. Start-Up / Er
Page 26 and 27: D−FL 100 Seite 22LED readout inst
Page 28 and 29: D−FL 100 Seite 247. MaintenanceTh
Page 30 and 31: D−FL 100 Seite 26Differential Pre
Page 32 and 33: D−FL 100 Seite 28Installation fla
Page 34 and 35: D−FL 100 Seite 30Inner diameter(m
Page 36 and 37: D−FL 100 Seite 329.5. Ordering In
Page 38 and 39: D−FL 100 Seite 34** Other materia
Page 40 and 41: D−FL 100 Seite 369.6.2. Variant e
Page 42 and 43: D−FL 100 Seite 3810. Calculation
Page 44 and 45: D−FL 100 Seite 4010.1. Explanatio
Page 46 and 47: D−FL 100 Seite 420C ° = b · 4mA
Page 48 and 49: D−FL 100 Seite 44GmbH
Page 50 and 51: D−FL 100 Seite 46II.Eignung von M
Page 52 and 53: D−FL 100 Seite 48DURAG GROUP comp

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

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