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

D−FL 100 Seite 299. Selecting the System Components9.1. Selecting the differential pressure transmitterIn order to select the appropriate differential pressure transmitter, the expected pressure range atnormal operating conditions must be estimated. Depending on which flow parameters are known, one ofthe following equations can be applied. The value for the c-factor which corresponds to the interiordiameter can be taken from the subsequent table. A differential pressure transducer with a maximumdifferential pressure of 2000 Pa serves as standard.Known quantity:Required measuring range of the differential pressuretransducer in [Pa]Gas velocity:Volume flow:Mass flow:Symbol Meaning UnitΔP Differential pressure Paρ Density in operating mode kg/m 3v Gas velocity m/sV Volume flow m^3/hcCorrection factorD KInner diameter mmm Mass flow kg/hT Operating temperature °CP Operating pressure Paρ NDensity in calibration mode(0°C und 1,014*10 5 Pa)Luft: ρ N=1,293kg/Nm 3If the standard volume flow is known, the required measuring range of the differential pressuretransmitter can be determined with the help of the following formula:whereV N = Standard volume flow [m^3/h]GmbH