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a sampling train.
The basic components of a typical
sampling train consist of:
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EXTRACTION |
 |
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TRANSPORT |
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SEPARATION |
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MOVING |
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METERING |
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| |
Sampling
|
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Sampling
|
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Pollutant
|
|
|
Gas
|
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|
Gas |
|
| |
Nozzle |
+ |
Probe |
+ |
Collection
|
+ |
Mover |
+ |
Metering |
|
| |
|
|
|
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Devices |
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|
Devices |
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Schematic of Typical Sampling
Train
A volume of sample gas extracted from the source
is pulled through a pollutant collection device
such as a filter or sorbent using a vacuum pump.
The volume of the sample is measured using a calibrated
dry gas meter. The
sample rate is monitored using a calibrated orifice
meter.
After sampling, typically an hour in duration
or greater, the sample(s) is/are recovered from
the sampling train and sent to an analytical laboratory
for analysis. The quantity of the pollutant collected
during the test run is reported in terms of mass.
The pollutant concentration for a specific test
run is the quantity of the pollutant recovered
in the train divided by the sample volume recorded
from the dry gas meter. Typically, the sample
volume is expressed in terms of standard or reference
conditions using the universal gas laws. In Ontario,
reference conditions are 25°C and 101.3 kPa. In
the United States, standard conditions are 68°F
and 29.92 Hg. |
