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TE-PNY1123 20 Operations Manual
7. Record the ambient air temperature, the ambient barometric pressure, the
sampler serial number, the orifice s/n, the orifice slope and intercept with
date last certified, today’s date, site location and the operators initials.
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.
9. 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 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
manometer readings from bottom of motor are recorded under the column
titled FLOW (mano). 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
H20 = orifice manometer reading during calibration, (20
Ta = ambient temperature during calibration, K ( K = 273 + oC)
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.
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