 Thermo
Environmental Instruments (TEI) Model 49C Ozone
analyzer: The 49C ozone analyzer samples
local ambient air quality year-round. Averaging
intervals of 1, 5, 60 and 480 minutes are automatically logged with
the data acquisition systems. The unit is setup and operated to
monitor ambient ozone concentrations up to 500 parts per billion.
The one hour ozone average is reported to the EPA AIRNow website
and converted and reported as an Air Quality Index (AQI). Principle Utilized: The
analyzer uses the principle of ultraviolet absorption; whereby ozone molecules absorb ultraviolet energy
at a known wave length of 254nm. The UV light available for detection
is proportional to the amount of ozone in the sample chamber.
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Fine Particulates (PM2.5)
 R&P
TEOM Series 1400a: The R&P TEOMcontinuously measures PM2.5 mass.
The one hour PM2.5 average is reported to the EPA AIRNow website
and converted and reported as an Air Quality Index (AQI). Principle Utilized: The TEOM operates at 50°C and continuously
measures PM2.5 mass by collecting fine particle mass on an oscillating microbalance. The signal is then processed to digital and analog outputs and captured by an
ESC data logger located at the site.
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Fine
Particulate (PM2.5) Speciation
IMPROVE Sampler: The IMPROVE (Interagency Monitoring of Protected Visual
Environments) sampler, which measures PM2.5 mass, PM10
mass and PM2.5 chemical speciation, operates on a 1-in-3 day sampling schedule at the Presque Isle monitoring site. Data is validated at the Crocker Nuclear
Laboratory at University of California-Davis and is then reported to the operating site
usually within a 6 to 12-month period.
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Thermo
Environmental Instruments (TEI) Model xxx Gas Filter Correlation Analyzer:
The carbon monoxide instrument
samples local ambient air quality 24 hours a day, 365 days a year.
Carbon monoxide averaging intervals of 1, 5, 60 and 480 minutes are automatically
logged with the data acquisition systems. Principle Utilized: The instrumental
operation utilizes the principle of "Gas Filter Correlation" that
is based on the fact that carbon monoxide molecules absorb infrared
radiation at a know spectral wavelength of 4.6 mm. The infrared absorption
characteristic is a non-linear technique. The TEI Model 48C electronics
package transforms the data output to a linear format. The signal
is then processed to digital and analog outputs and captured by an
ESC data logger located at the site. |
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 Thermo
Environmental Instruments (TEI) Model 42C Chemiluminescence Oxides
of Nitrogen Analyzer: The instrument
samples local ambient air quality 24 hours a day, 365 days a year.
Averaging intervals of 1, 5 and 60 minutes are automatically logged
with the data acquisition systems. Principle Utilized: The instrumental
operation utilizes the principle of "Chemiluminescence" that is based
on the rapid gas phase reaction of nitric oxide molecules and ozone
molecules. The TEI
Model 42C electronics package transforms the data output to a linear
format. The signal
is then processed to digital and analog outputs and captured by an
ESC data logger located the site. |
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 Thermo
Environmental Instruments (TEI) Model 43C Pulsed Fluorescence Analyzer:
The 43C SO2 instrument samples local ambient air quality
24 hours a day, 365 days a year. Averaging intervals of 1, 5 and 60 minutes are automatically logged with the data acquisition systems. Principle Utilized: The
instrumental operation utilizes the principle of "Pulsed Fluorescence"
that is based on the fact that sulfur dioxide molecules absorb fluorescent
energy, producing electronically excited SO2 molecule with
a known spectral decay rate to the ground state. The fluorescence
emitted by the reaction is detected by a photo multiplier tube and
the signal is converter proportionally to a electronic output signal. The signal
is then processed to digital and analog outputs and captured by an
ESC data logger located at each the site.
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 Thermo
Environmental Instruments (TEI) Model 41C Gas Filter Correlation Analyzer:
The carbon dioxide instrument
samples local ambient air quality 24 hours a day, 365 days a year.
Carbon dioxide averaging intervals of 1, 5, 60 and 480 minutes are automatically
logged with the data acquisition systems. Principle Utilized: The instrumental
operation utilizes the principle of "Gas Filter Correlation" that
is based on the fact that carbon monoxide molecules absorb infrared
radiation at a know spectral wavelength of 4.6 mm. The infrared absorption
characteristic is a non-linear technique. The TEI Model 41C electronics
package transforms the data output to a linear format. The signal
is then processed to digital and analog outputs and captured by an
ESC data logger located at the site. |
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 Environmental
Systems Corporation (ESC) Model 8832 Data Logger: The Presque Isle currently utilizes and ESC 8832 Data Logger. The outputs of the analyzers are connected to the inputs
of the data logger and these inputs are scanned every second by the logger. At the
end of one minute, the 60 one second averages are averaged and a one minute
average is created. At the end of one hour the 60 one minute averages are
averaged into a one hour average. The data logger is also programmed to initiate the calibration sequences that some analyzers are required to perform on a daily basis. |
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