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TE-WILBUR OPERATIONS MANUAL REV 002.15 06/11/2015
Tisch Environmental 1-TSP-AND-PM10 sales@tisch-env.com www.tisch-env.com Page 62 of 183
Barometric Pressure Sensor Calibration Screen
7.4 Volumetric Flow Calculation
The TE-Wilbur uses a highly accurate mass flow sensor to measure the mass
flow of the flow system. The system then calculates the actual volumetric
flowrate using the following formula:
=(
)(
)
Where:
Qa =
Actual Flow or Volumetric Flow in Lpm
Qs =
Mass flow
Ps =
Standard USEPA Barometric Pressure = 760 mmHg
Pa
= Actual Barometric Pressure Conditions in mmHg
Ts =
Standard USEPA ambient Temperature = 298.15 Deg K
Ta
= Actual ambient Temperature Conditions in Deg K
Rewriting:
=(
)(+.
. )
Where: Ta is now ambient temperature in Degrees Celsius.
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