mru OPTIMA7 biogas User Manual page 43

Current flow velocity
The flow velocity by Pitot tube will be determined by means of the
measured pressure and density (see equation 3).
Equation 3: flow velocity
: flow velocity in [m/s]
P
: pressure difference in [Pa]
p: density of gas
The geometry of the used Pitot tube will be considered by the pitot fac-
tor.
Equation 4: flow velocity with pitot factor
K : pitot factor
pitot
Current volume flow
The current volume flow is, the current flow velocity multiplied by the
cross-section area.
Equation 5: volume flow
q = v * A
v,mom mom
: current volume flow in [m³/s]
q
v,mom
: current flow velocity in [m/s]
v
mom
A: cross-section area in [m²]
MRU GmbH, D-74172 Neckarsulm
USER MANUAL OPTIMA 7 Biogas
: mean value of pressure difference in [Pa]
in
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