Quadera Pfeiffer программа управления (1248465), страница 16
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Use the "Add MCD Task" tool toadd a new component (measurement task).Image of "GSC Matrix" editor (example)ParameterRangeDescription•Letters anddigitsName of the calibration gascomponent.ComponentNote:In an MCD project, use an identicalname for the gas component.Otherwise, QUADERA® cannot referto this component. As an example,QUADERA® does not equate "O2"and "Oxygen".•ConcentrationNumber > 0Concentration of the calibration gascomponent.•Mass(not editable)The gas specific calibration factorsare determined for thesemeasurement tasks:accepted from the MID recipe ("TaskName" parameter).•Mass #CheckboxDefines whether a calibration factorfor the component is determined inthe corresponding measurementtask, or not.Note:•Only one calibration factor can becalculated per measurement task.•Several calibration factors percomponent can be determined atthe same time.•A red colored cell indicates theinternal standard.
Use thecontext menu of the "GSC Matrix"editor to set the internalstandard.135QUADERA HTML HelpContext menu of the "GSC Matrix" editorIn this context menu the following commands are available:•Delete selected Component: delete the marked measurement task (tablerow) from the "GSC Matrix" editor.•Delete selected Mass: delete the marked mass (table column) from the"GSC Matrix" editor.•Set as internal standard: set the internal standard for the calibrationfactors.Proceed as follows to set the internal standard for the calibration factors:1. Open the context menu in the table element related to the mass/componentpair you want to set as internal standard.2.
Click Set as internal standard. The table element for the internal standardappears with a red background color.136QUADERAGSC Result ViewThe parameters required to determine the calibration factors are displayed in the"GSC Result View" of the calibration project.The "GSC Result View" displays the calibration factors in a tabular form. They arecalculated for all measurement tasks of the MID recipe, using the correspondingmeasured data. In the course of time you can extend and complete the MCDCalibration Factor Library (function "Apply to MCD Calibration Factor Library") byusing various calibration gases to determine the calibration factors.Image of "GSC Result View" (example)ParameterRangeDescription•Component(not editable)Name of the calibration gascomponent:applied from the "GSC Matrix" editor("Component" parameter).•Mass(not editable)Measurement tasks for which the gasspecific calibration factors aredetermined:applied from the related MID recipe("Task Name" parameter).•Intensity(not editable)Intensity at the related mass number:corresponds to the currentlymeasured value for this massnumber.•Factor(not editable)The calibration factor is automaticallycalculated from the measuredintensity and the specifiedconcentration.•Apply toMCDCalibrationFactorLibraryButtonApply the current gas specificcalibration factors to the MCDCalibration Factor Library.NOTE:•New calibration factors are addedto the MCD Calibration FactorLibrary,•Current values replace existingdata sets in the MCD CalibrationFactor Library.137QUADERA HTML Help138QUADERAMCD Calibration Factor LibraryMeasuring the concentration of the components of a gas mixture requires that thecorresponding calibration factors are known.
These are stored in the MCD CalibrationFactor Library, in tabular form. Each calibration factor is defined in the relatedcalibration project by the mass number and the name of the correspondingcomponent.The calibration factors are quantified relatively. This requires to set one calibrationfactor as the internal standard. Normally, the calibration factor for N2 (m/e = 28) isused and set to 1 (standard setting). The other calibration factors relate to thestandard.
This approach allows you to create a consistent MCD Calibration FactorLibrary. Use the context menu of the "GSC Matrix" editor to set the internal standard.Image of MCD Calibration Factor Library (example)Extending the MCD Calibration Factor LibraryProceed as follows to extend the MCD calibration factor library:1. Perform a new gas specific calibration (calibration project).2. Apply the new calibration factors to the MCD Calibration Factor Library:In the section of the calibration project, click Apply to MCD CalibrationFactor Library.Deleting the MCD Calibration Factor Library1. Click Delete MCD Calibration Factor Library to remove all data sets fromthe MCD calibration factor library.NOTE:"Delete MCD Calibration Factor Library" deletes the data sets of the MCDCalibration Factor Library irretrievably.
In this case, a new gas specificcalibration is required for new data sets.139QUADERA HTML HelpMeasurements using QUADERAMeasurement Projects and Measurement Project TemplatesIn QUADERA®, data are stored as measurement project templates and asmeasurement projects. Each measurement project template or measurement projectis used for a specific measurement task.Measurement project templatesMeasurement project templates allow you to access frequently performedmeasurement tasks easily. Measurement project templates are created by INFICONor experienced users in order to keep the effort required for configuring typicalmeasurement tasks at a minimum.
Typical measurement project templates areinstalled together with QUADERA®. You can find these in the Start page.In addition QUADERA® provides basis templates for each measurement project, suchas Scan, MID, MCD etc. These templates normally include just one measurement taskand are intended to create user specific measurement project templates, for ab initiomeasurement projects.Measurement projectsA measurement project contains the measuring data as well as an image of thedevice required for displaying the measuring data correctly.Measurementproject templateMeasurementprojectFile extension*.QMT*.QMPRecipe definitionYesYesConfigured sectionsYes, severalYes, severalDevice settingsReference to thedevice typeComplete image of thedeviceMeasuring dataNoYesComparison: Measurement project template vs.
measurement project140QUADERAScan Measurement ProjectsIn a scan-analog measurement, the ion current is measured as a function of m/e.This quickly allows you to make a qualitative statement such as "The gas consists of..., ..., ..., of which ... represents the majority. The fraction of ... is very small orcannot be measured".However, it is rather cumbersome to deduce the quantitative composition of the gasin % or ppm.
Information about changes in the gas composition with time is hard todeduce from a sequence of several scans, and measurements over long periods oftime also result in extremely large amounts of data.In scan-analog measurement projects you can also add analog input tasks (e.g. viaquadrupole controller QC, "EXT IN").NOTE:A precise measurement requires the correct calibration of the components ofthe mass spectrometer.Example for the course of a scan measurement projectNOTE:For a written documentation of your measurement projects you can capturescreens of the QUADERA® user interface.141QUADERA HTML HelpMID Measurement ProjectsIn an MID measurement (Multiple Ion Detection) you specify distinct m/e values forwhich the ion current is to be measured.
Only the specified mass numbers arescanned in this case. Each of these mass numbers is represented by a separatemeasurement task for which all parameters can be set.Changes in the gas composition with time can be recorded and displayed easily. Anadditional analysis of the measuring data allows you to convert the results intoconcentrations given in %, ppm, etc (MCD measurement).NOTE:A precise measurement requires the correct calibration of the components ofthe mass spectrometer.Example for the course of an MID measurement projectNOTE:For a written documentation of your measurement projects you can capturescreens of the QUADERA® user interface.142QUADERAMCD Measurement ProjectsThe MCD measurement (Multiple Concentration Determination) is based on an MIDmeasurement project and includes additional evaluation to measure concentrations.
Amatrix of calibration factors (analysis matrix) is used to convert the measured ioncurrents into concentrations of the individual gas components. The calibration factorsare not universally valid. They must be quantified by a separate measurement usingcalibration gases, i.e. one or more GSC measurements. The actual MCD measurementand the calibration are closely connected.NOTE:A precise measurement requires the correct calibration of the massspectrometer components.1. Before starting the measurement, check the correct calibration of thecomponents of the mass spectrometer. If calibration is necessary, perform thefollowing preparatory measurements:• Calibrate the mass scale,• Measure the offset,• Determine the background of the mass spectrometer,• Quantify the gas specific calibration factors.2.
Open the start page: In the View menu, click Show Start Page.3. Click on the icon for the required device.4. Create a new MCD measurement project: In the "Templates" list, double-clickthe desired measurement project template. This way you create a newmeasurement project based on the selected template.5. The new measurement project window appears. The working area displays theMCD project.• Edit the MCD recipe if necessary: click the corresponding tab in theworking area selection,• Display the measuring data: click the corresponding tab in the workingarea selection.NOTE:You can start the measurement regardless whether the recipe editor or theworking area has been selected.6. Start the measurement: In the device status view, click on the "Start" icon.The connection to the device is automatically established. The device nowreceives the parameters for the current measurement task. You can adjust thechart layout while the measurement is running.7.
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