Instrumentation

Ozone • PM2.5 • PM2.5 Speciation • Carbon Monoxide • Nitrogen DioxideSulfur Dioxide • Carbon Dioxide • Meteorological • Data Acquisition


Ozone (O3)

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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Carbon Monoxide (CO)

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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Nitrogen Dioxide (NO2)

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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Sulfur Dioxide (SO2)

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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Carbon Dioxide (CO2)

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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Meteorological



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Data Acquisition

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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