TE-CD-TSP 26 Operations Manual
Enter the average temperature of the sample throughout the
sample period in Deg F. The temperature will then be
calculated in Deg K
Enter the average barometric pressure of the sample
throughout the sample period in Inches of Hg. The barometric
pressure in mmHg will then be calculated
Enter the clean filter pressure in inches of water prior to
Enter the dirty filter pressure in inches of water after
sampling. The average sample pressure will then be
calculated in mmHg
Enter the total runtime in hours (xx.xx) of the sample
Using the g-factor formula, Po/Pa will be calculated and an average flow rate of the sample will be calculated in
m3/min. Using this information, the total sample volume will be calculated.
If you do not have a G Factor, contact Tisch Environmental.
An example of a Volumetric Flow Controlled Sampler Calibration Data Sheet has been attached with
data filled in from a typical calibration. This includes the transfer standard orifice calibration
relationship which was taken from the Orifice Calibration Worksheet that accompanies the calibrator
orifice. The slope and intercept are taken from the Qactual section of the Orifice Calibration Worksheet.
The first step is to convert the orifice readings to the amount of actual air flow they represent using the
Qa = 1/m[Sqrt((H2O)(Ta/Pa))-b]
Qa = actual flow rate as indicated by the calibrator orifice, m3/min
H2O = orifice manometer reading during calibration, in. H2O
Ta = ambient temperature during calibration, K ( K = 273 + °C)
Pa = ambient barometric pressure during calibration, mm Hg
m = slope of Q actual orifice calibration relationship
b = intercept of Q actual orifice calibration relationship.
Once these actual flow rates have been determined for each of the five run points, they are recorded in
the column titled Qa, and are represented in cubic meters per minute. EPA guidelines state that at least