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TE-5170 TSP MFC 19 Operations Manual
8. Disconnect the sampler motor from its power source and remove the orifice and
top loading adapter plate. Re-connect the sampler motor to the electronic mass
flow controller.
An example of a Lead (or TSP) 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. Since this calibration is for a TSP sampler, the slope
and intercept for this orifice uses standard flows rather than actual flows and is taken
from the Qstandard section of the Orifice Calibration Worksheet. The Qactual flows are
only used when calibrating a PM-10 sampler.
The five orifice manometer readings taken during the calibration have been recorded
in the column on the data worksheet titled Orifice "H2O. The five continuous flow
recorder readings taken during the calibration have been recorded under the column
titled I chart.
The orifice manometer readings need to be converted to the standard air flows they
represent using the following equation:
Qstd = 1/m[Sqrt((H20)(Pa/760)(298/Ta))-b]
where:
Qstd = actual flow rate as indicated by the calibrator orifice, m3/min
H2O = orifice manometer reading during calibration, (2O
Ta = ambient temperature during calibration, K ( K = 273 + °C)
298 = standard temperature, a constant that never changes, K
Pa = ambient barometric pressure during calibration, mm Hg
760 = standard barometric pressure, a constant that never changes, mm Hg
m = Qstandard slope of orifice calibration relationship
b = Qstandard intercept of orifice calibration relationship.
Once these standard flow rates have been determined for each of the five run points,
they are recorded in the column titled Qstd, and are represented in cubic meters per
minute.
The continuous flow recorder readings taken during the calibration need to be
corrected to the current meteorological conditions using the following equation:
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