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

D−FL 100 Seite 420C ° = b · 4mA + cThe coeffizients b and c can be resolved out of this two equations: b=25 c=-100y = 25·x-100tThe y out of this equation replaces the T in the formula of the standard flow. The square roothas to be done inside the DMS500.For the absolute pressure transmitter with a span of 900-1100 hPa this means:1100hPa = b · 20mA + c900hPa = b · 4mA + cThe coeffizients b and c can be resolved out of this two equations: b=12.5 c=850y = 12.5 · x + 850PThe y out of this equation replaces the P in the formula of the standard flow. The square roothas to be done inside the DMS500.The final formula inside the data logger is:Vn= Kx·ytyP·+ 273,15 ydpPage 2On page 2 the mechanical dimensions are calculated. It is necessary for every application tocheck the length of the probe. If the length is not correct, the differential pressure bar hasto constructed completly new.The program calculates the positions for the measuring points according to the formula statedin the VDI 2066. It is important that no measuring point is inside a tube of the flanges. This isdone by the program. However it should always be verified.GmbH