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- | ==== Overview ==== | + | **Overview** |
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- | The Merlin AutoGC Xplorer (**MAX**) is a cloud-based database designed to ingest data generated by chromatographic equipment deployed into EPA Photochemical Assessment Monitoring Sites (**PAMS**) which are collecting and analyzing hourly concentrations of up to 60 volatile organic compounds (**VOC**). | + | |
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- | Orsat, LLC has developed and designed MAX to accommodate data originating from either PerkinElmer Ozone Precursor systems or Agilent systems using Markes International pre-concentration sampling system. | + | |
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- | ==== Features ==== | + | |
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- | The PAMS AutoGC systems collect not only hourly ambient air data but also have Quality Control samples which are outlined in the EPA PAMS Technical Assistance Guidance document (**TAD**). | + | |
- | === Quality Control Sample Types === | + | |
- | - Calibration Verification Standard (CVS) or Continuing Calibration Verification (CCV) Standard | + | |
- | * Required daily | + | |
- | * Used to confirm system response daily; recoveries generally ± 30% specified in the Network configuration | + | |
- | - System Blank (SB) or Method Blank | + | |
- | * Required daily | + | |
- | * Used to determine concentrations of target compounds which may be contributed by the analytical system | + | |
- | - Laboratory Calibration Standard (LCS) or Second Source Calibration Verification (SSCV) Standard | + | |
- | * Required weekly | + | |
- | * Used to confirm original calibration by reference. | + | |
- | - Retention Time Standard (RTS) | + | |
- | * Required weekly | + | |
- | * Used to verify correct target identification by retention time windows in method. | + | |
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- | === Format for Incoming Data - ASCII Text === | + | |
- | The output format for data generated by the analytical data system must adhere to a specific ASCII text format to enable MAX to be able to correctly interpret and store the data. Orsat has generated output formats for both the Totalchrom and EZChrom data systems. | + | |
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- | * Instrument Name - (Format " | + | |
- | * Filename - specific format (see File Naming) | + | |
- | * Acquisition Time - the time the analytical data collection started. | + | |
- | * Process Date and time- the time the data file was generated | + | |
- | * Sample Name, generally Blank, Standard, Ambient Air, IQ-RTS, CS-LCS | + | |
- | * Instrument Name | + | |
- | * Instrument method filename | + | |
- | * Sequence filename | + | |
- | * Peak Details | + | |
- | * Component Name | + | |
- | * Amount in ppbC | + | |
- | * Retention time | + | |
- | * Peak Area | + | |
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- | MAX was designed to identify the QC control samples by using a specific file naming paradigm. | + | |
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- | // | + | |
- | FIlenameStructure 2.png// | + | |
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- | ==== Network and Site Configuration ==== | + | |
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- | In order to allow the evaluation of these QC samples each data set or //Site// has a definition which incorporates configuration parameters for the //Network// which defines information about incoming data such as a list of target VOCs, which targets will be in the QC samples and their concentrations and control limits. | + | |
- | === Information Required for Network Configuration === | + | |
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- | - Units (default is ppbC) | + | |
- | - How Lost data will be displayed | + | |
- | - How zero values will be displayed | + | |
- | - Total Blank Maximum value | + | |
- | - List of Target Compounds by Channel | + | |
- | - List of Target Compounds in each of the required QC samples (LCS, CVS, RTS, Blank and MDL) including required control limits | + | |
- | - List of applicable Null, Qualifier and Inform Flags available for use in AQS files. | + | |
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- | Each Site also has unique information to identify it in the database. | + | |
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- | === Information Required for Site Configuration === | + | |
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- | - Site name (defined in the incoming ASCII text file as " | + | |
- | - Type - designation of data system generating the data, PerkinElmer or EZChrom | + | |
- | - Minimum display value - generally 0 | + | |
- | - Network assigned to the site | + | |
- | - AQS number assigned to the site | + | |
- | - POC if necessary | + | |
- | - Short name - user entered text field | + | |
- | - Formal name - user entered text field | + | |
- | - Address, City and Zipcode | + | |
- | - Latitude and Longitude | + | |
- | - UTC offset | + | |
- | - CAMS code (if available) | + | |
- | - Interval, units code and method codes required for AQS file generation | + | |
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- | ---- | + | |
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- | These rights are given to operators and do not include some features | + | |
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- | * | + | |
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- | ---- | + | |
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- | **References** | + | |
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- | EPA Technical Assistance Document (TAD) | + | |
- | ---- | + | |
- | https:// | + | |
- | ---- | + | |
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