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Model 3068B Aerosol Electrometer User`s Manual

1. Indoor use Altitude up to 3000 m 10 000 ft Ambient temperature 10 35 C Operates in a CE safe manner from 5 40 C Ambient humidity 0 90 RH non condensing Over voltage category II Pollution degree II Specifications are subject to change without notice TSI and the TSI logo are registered trademarks of TSI Incorporated Model 3068B Aerosol Electrometer APPENDIX B Theory of Operation How the Aerosol Electrometer Operates The Model 3068B Aerosol Electrometer consists of a Faraday cup and an electrometer Figure B 1 Particles in the sample flow are collected in a high efficiency conductive filter housed in a metal enclosure the whole constituting a Faraday cup The metal housing shields the Electrometer input from stray electric fields This filter is isolated from the metal housing but connected to the ground through an Electrometer current sensor Electrons will move from the ground to the filter to neutralize the collected particles if they are positively charged and vise versa if particles are negatively charged The current measured by the electrometer current sensor is proportional to the charge collection rate on the filter The particle number concentration can be calculated from the current if the number of charges on each particle and the aerosol flow rate are known Insulator ay octets See eters e524 Neutralized Particles a 4 Conductive KO
2. Particle Instruments Model 3068B Aerosol Electrometer User s Manual P N 1930077 Revision A May 2006 TSI Product Overview Unpacking and Model 3068B Setting Up the Aerosol Electrometer System Controls Indicators and Connectors User s Manual Operating the Aerosol Electrometer Aerosol Instrument Manager Software Maintenance Troubleshooting Contacting Customer Service Appendixes Manual History The following is a manual history of the Model 3068B Aerosol Electrometer Part Number 1930077 Revision Date A May 2006 Part Number Copyright Address E mail Address Limitation of Warranty and Liability effective July 2000 Service Policy Warranty 1930077 Revision A May 2006 TSI Incorporated 2006 All rights reserved TSI Incorporated 500 Cardigan Road Shoreview MN 55126 USA particle tsi com Seller warrants the goods sold hereunder under normal use and service as described in the operator s manual shall be free from defects in workmanship and material for 12 months or the length of time specified in the operator s manual from the date of shipment to the customer This warranty period is inclusive of any statutory warranty This limited warranty is subject to the following exclusions a Hot wire or hot film sensors used with research anemometers and certain other components when indicated in specifications are warranted for 90 days from the date of shipm
3. 1 6 x 10 19 coulomb is the elementary unit of charge and qe cm s is the volumetric aerosol flow rate into the Electrometer filter When the average number of elementary charge units per particle is known the aerosol concentration can be calculated from equation 1 The current measurement accuracy of the Model 3068B Aerosol Electrometer is 2 of the reading or 5 femptoamp whichever is greater The user specified flow rate either through key pad or computer is achieved through an internal proportional solenoid valve and measured by a TSI Model 4140 Thermal Mass Flowmeter An external vacuum source should be connected to the External Vacuum port on the back panel of the instrument to drive the flow Model 3068B Aerosol Electrometer External Vacuum Pump Proportional i Model 4140 Solenoid Flowmeter Valve Exhaust AS Shield Signal Housing Feed through Signal Sample Inlet Nc 0 to 10 L min Signal Output Ground Inner Insulator Filter Housing Insulator oor Faraday Cup Figure B 2 Schematic Diagram of the Aerosol Electrometer Selected References The following list contains papers that apply directly to the Aerosol Electrometer as well as other references that may be interesting to the reader 1 Agarwal JK and GJ Sem 1978 Generating Submicron Monodisperse Aerosols for Instrument Calibration TSI Quarterly Vol IV No 2 TSI Incorporated 500 Cardigan Road Shoreview MN 55126 2 L
4. AUTE sample Figure 5 30 Table View Popup Menu 5 40 Model 3068B Aerosol Electrometer Table 5 5 Table View Popup Menu Menu Item For a description see Color Format Menu Font Format Menu Abort current sample Run menu Copy View Menu Print File Menu Print Preview File Menu Graph View Popup Menu Display As d v Electrometer Current fA View Boundaries Abort current sample Graph Type Grid Lines Color Font Undo Zoom Z Copy Ctrl C Print Print Preview Figure 5 31 Graph View Popup Menu Calculated Concentration H cr Table 5 6 Graph View Popup Menu Menu Item For a description see Display As Below Y Axis Format menu Display View Boundaries Format menu Abort current sample Run menu Grid Lines Format menu Color Format Menu Font Format Menu Undo Zoom Format Menu Print File Menu Print Preview File Menu Aerosol Instrument Manager Software 5 41 Display As Select Display As and then select either Electrometer Current or Calculated Concentration for display in the active window Below is a graph view showing calculated concentration Data Graph AIM1_E68 5 42 Figure 5 32 Graph View Showing Calculated Concentration Statistics View Popup Menu SOCIE sample Figure 5 33 Statistics View Popup Menu Model 3068B Aerosol Electrometer T
5. The Model 3068B Aerosol Electrometer information is displayed when you view the Settings window or when you print out s ample results The table below describes each of the fields in this dialog tab Hectrometer Properties New Sample X Scheduling Settings Communications Electrometer Sample Flow pm Avg o Particle Charge C Offset FA Title sample 2 Instrument ID 70552138 1 0 38 Comment Figure 5 9 The Settings Tab of the Properties Dialog Box Table 5 2 Descriptions of Settings Parameters for an Aerosol Electrometer Parameter Sample Flow lpm Manual Flow Setting lpm When setting up for a new sample the current sample flow control mode is read from the instrument The flow mode may be changed using the front panel of the instrument or using the instrument status dialog window For each sample you may enter a sample flow rate When the flow control is set to ON or automatic mode the flow value entered in this dialog is sent to the instrument as the flow set point and the actual flow rate is read from the flowmeter inside the instrument and used to calculate particle concentration at each measurement interval In manual mode the flow rate you enter in this dialog is subsequently used to calculate particle concentration The value must be between 0 3 10 0 L min Aerosol Instrument Manager Software 5 17 Average Particle You may enter a
6. Visual Basic or National Instruments LabVIEW software This can usually be accommodated using the serial port RS 232 commands see Appendix D Serial Commands Please note that TSI does not support third party software The command set is provided for your convenience only Ovisual Basic is a registered Trademark of Microsoft Corporation LabVIEW is a registered trademark of National Instruments 4 4 Model 3068B Aerosol Electrometer CHAPTER 5 Aerosol Instrument Manager Software This chapter describes Q Q Q Installation requirements Getting started Software procedure This section describes the installation requirements for the Aerosol Instrument Manager software and the installation procedure Installation Requirements To use this software we recommend a personal computer with the following minimum features components and software Q a a a A Pentium 586 processor or higher A SVGA color monitor Microsoft Windows 2000 or Windows XP operating system A hard drive large enough to accommodate Windows the Aerosol Instrument Manager software and data files Note The amount of disk space required depends on the number of samples you collect the amount of information collected and the sampling period After you have collected a number of samples you may want to look at the file size to estimate how much storage space you will be using A CD ROM drive 25
7. 2 Flow Setting Flow Control Average Charge M dict Save Sai i i ove cursor among digits ettings Edit Setting with Edit Increase Edit Decrease oeg Setting cursor Average Charge Particle Flow Setting Analog Output DA Save 2 3 Move cursor among digits Settings Edit Setting with Edit Increase Edit Decrease Setting cursor 2 Analog Output Average Charge Data Average Choose one range Settings 2 Data Average Time Analog Output Seen a Choose one value Settings Settings 2 Electrometer Zero Data Average Flow Control New average zero value Abort or Indicator Lights Two indicator lights above the display on the front panel provide a quick indication of the Electrometer s current operating status Power A steady glow of the power light indicates that the instrument is powered on The power light goes off when the power to the Electrometer is shut off Status A steady glow of the status light indicates that the instrument has warmed to its operating temperature and the user specified flow is achieved The light will blink in one of the following situations Q The flow rate is not within 10 of the specified value or if it is in manual control mode Q The cabinet or aerosol temperature is greater than 50 C or less than 0 C Q The flat cable to the sensor is disconnected see Figure 7 1 Control Indicators and Connectors Back Panel 3 4 As shown in Figure 3 3
8. RH and 35 C To check the zero offset and its drift put a HEPA filter at the inlet of the electrometer Using Aerosol Instrument Manager software take a two minute measurement of current with 1 s average and record the N current data I View the RMS value calculated in the statistics section or calculate the zero offset J as e N I fN i l Troubleshooting 7 3 7 4 Take multiple offset measurements over a certain period e g 1 hour If the offset does not drift greater than 2 fA over time simply subtract the offset readings from your measurement values However if the offset drifts significantly follow the diagnostics steps given in the previous section Noisy Electrometer Output Model 3068B Aerosol Electrometer CHAPTER 8 Contacting Customer Service This chapter gives directions for contacting people at TSI Incorporated for technical information and directions for returning the Model 3068B Aerosol Electrometer for service Technical Contacts Returning the Service QO If you have any difficulty setting up or operating the Electrometer or if you have technical or application questions about this system contact an applications engineer at TSI Incorporated 1 800 874 2811 USA or 651 490 2811 or e mail technical service tsi com If the Electrometer does not operate properly or if you are returning the instrument for service visit our website at http rma tsi com or contact TSI Custome
9. To Figure D 2 Connect To a Serial Port 4 Enter the port settings described below and click OK Figure D 3 Port Settings 5 Open File Properties Under the settings tab on the Property window pick the ASCII Setup button and check the boxes Serial Commands D 3 D 4 shown below Click OK to close both ASCII Setup and Properties windows TSI 3068B HyperTermina File Edt View Cal Tr E ols als abl Connect To Settings Function arrow and ctrl keys act as Terminal keys Windows keys ASCII Setup 2x gt ASCII Sending Cul H Space Ctrl H IV Send line ends with line feeds IV Echo typed characters locally Line delay 0 milliseconds Character delay fo milliseconds 500 gt ASCII Receiving IV Append line feeds to incoming line ends TF Force incoming data to 7 bit ASCII ASCII Setup IV Wrap lines that exceed terminal width necting or disconnecting Figure D 4 ASCII Setup 6 Now select File Save As and save the file to the desktop for easy access 7 Close the program and start it again from the desktop It should automatically open a connection to the instrument To obtain a complete list of the serial commands follow the next steps 1 Type HELP in the Hyper Terminal window for a list of commands The commands are case insensitive Model 3068B Aerosol Electrometer TSI 3068B HyperTerminal Ble ES File Edit vie
10. access cover 3 6 filter cartridge replacing 6 2 finish current sample 5 25 firmware version 4 4 flat cable location 7 2 flow control 5 36 flow control menu 4 2 flow rate A 1 Flow Ratio light troubleshooting 7 1 flow set point 5 36 flow setting menu 4 2 flowmeter checking 6 4 font 5 31 5 41 5 43 font dialog box 5 31 format menu 5 27 5 41 color 5 29 font 5 31 graph type 5 28 grid lines 5 29 screen 5 27 undo zoom 5 31 view boundaries 5 28 Y axis 5 27 front panel 3 1 controls 4 1 display A 1 indicator lights 3 3 G getting started 5 3 graph 5 32 graph color dialog box 5 30 graph toolbar 5 36 graph type 5 28 graph view popup menu 5 41 display as 5 42 popup menu dialog box 5 41 graph view popup menu 5 5 graph view showing calculated concentration 5 42 grid lines 5 29 5 41 H help xix 8 1 help commands list D 5 help manual 5 38 help menu 5 38 dialog box 5 38 HEPA filter 4 3 l J icons playback 5 7 status bar 5 43 import 5 23 indicator lights 3 3 indicators 3 1 instrument status dialog box 5 35 insulator 6 3 isolating leaks 6 5 K keypad 3 2 L LabVIEW software 4 4 leaks isolating 6 5 testing for 6 4 lights see indicator lights linearity error A 1 list of recently accessed files 5 24 M maintenance 6 1 schedule 6 1 manual history iv notations conventions xviii organization xvii manual flow setting 5 17 mark samples fo
11. aim v7 testing AIM1 E68 E Sample 3 03 07 06 14 52 00 C dev aim v7 testing AIM1 E68 Figure 5 7 Two Pane Layout of an Aerosol Electrometer File All of the program windows that are currently open on the desktop are listed at the bottom of the Window menu under the Close All item To make a window active and bring it to the top of all windows select the name of the window from the list of open windows Quit the Program To end the program select File Exit All windows and files open on the desktop are closed If you have made changes to a file and have not yet saved it you will be prompted to do so Aerosol Instrument Manager Software 5 13 Software Procedures Before using the information in this section read Getting Started earlier in this chapter This section provides getting started information to help you understand the basics of how the program works The subsections of this section provide Q How To information for setting properties for an Aerosol Electrometer and how to collect sample data for analysis by the program a A description of all menus and menu items available when using an Aerosol Electrometer or viewing data files How to Set Up Instrument Properties The Properties dialog box can be opened through one of the menu options File Properties or Run Properties or using the shortcut lt Ctrl R gt For a new sample connect the instrument to the computer refer to Connecting to
12. details Details include date pathname and title of the sample When a window is active on the desktop you can display the Format menu items plus other menu items by placing the cursor in the window and clicking the right mouse button Format View Sample Y Axis View Boundaries Graph Type Grid Lines gt Fomat View Sa Color Large Icons Font Snalcons Eos ee List i nda ZO aT Z Y Detail B Figure 5 15 Format Menu A When A Graph Window Is Active B When A Samples List Window Is Active Y Axis This menu item is available only when a graph window is active on the desktop Select Format Y Axis or select Y Axis from the graph context menu to change the Y axis scale See Figure 5 16 By default the graphs display in linear with auto scaling You can select either linear or log and you may select a minimum and or maximum value for the Y axis If you select the Max radio button the corresponding edit box will be enabled and you may enter a value for the Y maximum Note The log scale option is not available when displaying electrometer current because this data may contain negative values Aerosol Instrument Manager Software 5 27 Figure 5 16 The Y Axis Dialog Box View Boundaries Select Format Display View Boundaries to display the View Boundaries on the graph Use the mouse to select and drag the boundaries to the desired location View boundaries are active only if check
13. high the electrometer can run at a higher flow rate to increase the signal In that case the tube length from the flow splitter to the electrometer should be increased proportionally Otherwise diffusion losses due to different flow rates should be corrected in the efficiency calculation When particles are in the sub 10 nm range particles exiting the DMA have a wider size distribution due to diffusion broadening A rigorous CPC calibration needs to carry out data inversion to account for this broadening effect Refer to the paper by Stolzenburg and McMurry see Appendix B for more details As an example the counting efficiency curve of the Model 3772 CPC is shown in Figure C 2 Model 3068B Aerosol Electrometer Dilution Bridge Makeup Particle Generation Instrument Test CPC Splitter Aerosol Electrometer Mixing a TSI 3068B Orifice Electrometer Eje ES eeee Ref CPC Figure C 1 Experimental Setup for CPC Calibration CPC Counting Efficiency Experimental data Fitted curve 1 10 100 Particle Diameter nm Figure C 2 Counting Efficiency Curve of the Model 3772 CPC Application Notes C 3 Characterizing Concentration Linearity Condensation Particle Counters CPCs are also characterized by the linearity of their response to an increase in concentration from zero to the limit of the counter using the electrometer as the reference Ideally the slope of the r
14. is reset when the offset is high and after changing the electrometer filter To reset the zero offset of the electrometer connect a High Efficiency Particulate Air HEPA Filter to the Sample Inlet connector Allow charged particles already within the system to purge observed as a steady current reading before setting zero Then press the left 4 or right arrow button It takes one minute to collect new zero offset and overwrite the previous value The zero offset reset is cancelled if ESC ESC is pressed during the reset process and the display returns to the User Setting Menu 8 Press ESC ESC at any of the previous steps to return to the User Setting Menu 9 Press ESC ESC again to return to the display aerosol current and flow rate To View Instrument Status You may view instrument status using the buttons on the front panel of the instrument or by opening the instrument status dialog from the Aerosol Instrument Manager software described in the next chapter To view instrument status using the buttons on the front panel 1 Press the up _4 or down _Y arrow button until you reach the Status Viewing menu Press Enter _ to view the aerosol temperature Press the down _Y arrow to view the aerosol pressure Press the down _Y arrow to view the ambient pressure Press the down _Y arrow to view the cabinet temperature Po 2 E 40 Press the down _Y arrow to view the valve duty cycle Operating the Aerosol E
15. menus are those menus that appear when you click the right mouse button when the cursor is positioned in an active window Nearly all menu items are available from both a desktop menu and a popup menu though a few items are only available in one or the other This section presents the items of the desktop menus first and then describes the menu items that are available only through the popup menus In addition to these menus a toolbar located just beneath the desktop menus provides shortcuts to the most commonly used menu functions Model 3068B Aerosol Electrometer Shortcut keys keyboard keystrokes that do not require the use of the mouse are also available They are described at the end of this section Desktop Menus Desktop menus are listed at the top of the Aerosol Instrument Manager desktop This section describes each of the desktop menus and the menu item available through the menu File Menu The items of the File menu are used to open save and recall files and perform other program operations In Figure 5 12 the figure shows the File Menu options for the Aerosol Electrometer File View Help New Ctrl N Open Ctri 0 Import gt 3781 WCPC Import Logging 1 CAdev myoffice_42606 E68 2 C dev 3 28 02 smps S80 3 C Program Files AIM1 S80 4C dev 4 may 06 AIMS E68 Ext Figure 5 12 File Menu Options for an Aerosol Electrometer New Select File New or Dl on the toolbar
16. operating system in either of two ways Figure 2 1 Q Connect the serial port of a computer to the Serial connector on the back of the Model 3068B Use the 4 meter cable provided If you need a longer cable use a standard 9 pin serial extension cable Q Connect a USB port of a computer to the USB port on the back of the Model 3068B USB driver software is installed on the host computer when you install the Aerosol Instrument Manager software ate JANUARY 2000 03 For Service and Informa Contact TSI Customer Service eet To avoid electrical shock the power cord protective grounding conductor must be connected lo earth ground Figure 2 1 Location of Serial and USB Ports Analog Output The Electrometer has a single channel analog output BNC connector labeled Analog Output This port can be easily configured through the user settings menu on the front panel see Chapter 4 or by serial commands see Appendix D to provide a variety of output ranges Microsoft and Windows are registered trademarks of Microsoft Corporation 2 4 Model 3068B Aerosol Electrometer Note The analog port is provided for backward compatibility with older electrometers The resolution is limited to 16 bit It is much more accurate to use the digital USB or Serial ports Optional Accessories The Aerosol Electrometer can be used together with the Model 3080 Electrostatic Classifier The Electrostatic Classifier can be used fo
17. select all 5 37 sequence files G 1 serial commands D 1 D 2 serial port 3 4 location 2 4 serial protocol D 2 service returning 8 1 service policy v set y axis scale 5 41 set y scale 5 28 setting up 2 1 setting up instrument properties 5 14 settings 5 34 screen 5 34 settings tab 5 16 properties dialog box 5 17 signal connections D 1 slow response time A 1 software 5 1 see also Aerosol Instrument Manager Software Aerosol Instrument Manager 4 4 context sensitive menus 5 38 graph view popup menu 5 41 samples list view popup menu display selected samples 5 39 5 40 select all 5 39 statistics popup menu 5 42 table view popup menu 5 40 desktop menus 5 21 getting started 5 3 graph view popup menu display as 5 42 installation 5 2 LabVIEW 4 4 software continued menus 5 20 other 4 4 procedures 5 14 starting program 5 3 Visual Basic 4 4 specifications A 1 spring wire 6 3 start 5 7 start at time 5 16 start data collection 5 24 start measurement 4 1 start the program 5 3 statistics 5 34 screen 5 34 statistics popup menu 5 42 statistics view popup menu 5 43 popup menu dialog box 5 42 status bar icons 5 43 status light 3 3 see also indicator lights status viewing menu 4 3 stop 5 7 5 26 stop current sample 5 25 supplying power 4 1 T table 5 32 screen 5 33 table color dialog box 5 30 table view popup menu 5 40 5 41 popup menu dialog box 5 40
18. set to the desired flow rate value Hit Enter to save the setting or hit ESC ESC to abort the setting Press the down _Y arrow to enter the Average Charge Particle setting menu Use the same method as flow setting to enter the average number of charges carried by each particle Press the down _ arrow to enter the Analog Output scale setting menu There are 11 scale options 12 5 to 12 5 pA 1 0 to 1 0 pA O to 12 5 pA O to 10 0 pA O to 1 0 pA O to 0 1 pA O to 0 1 pA O to 1 0 pA O to 10 0 pA O to 12 5 pA OFF Note The analog port is provided for backward compatibility with older electrometers The resolution is limited to 16 bit 4 2 Model 3068B Aerosol Electrometer It is much more accurate to use the digital USB or Serial ports Use the left 4 or right _ arrow to scroll through the scale options The scale change is effective immediately 6 Press the down _ Y arrow to enter the Data Average Time setting menu Use the left 4 or right arrow to select one of the running average time options 1 2 3 4 5 6 10 12 15 20 30 60 seconds 7 Press the down _Y arrow to enter the Zero Offset Reset menu Zero offset is the background current which should be subtracted from each measurement reading With the temperature stabilization circuitry and the large dynamic range features of this electrometer zero offset should not require adjustment very often It is recommended that the zero offset
19. sey sey chu aus deveeee di aeeey 3 3 Back Panel iii tA Ghee He Sata ae eee 3 4 AC Power Connector and On Off Switch o occocccccnononncnon 3 4 Serial POM apers arr eset Sees keren aR e 3 4 USB POC A e 3 4 vii ANALOG OUt NT 3 5 Aerosol lt ta 3 5 External Vacuum Tubing oocccoccnnccnnccnnoconacaniconiconacanacinanos 3 5 Filter ACCESS COVER citen din alii 3 6 CHAPTER 4 Operating the Aerosol Electrometer 4 1 Front Panel Control iiss s scsascsvescesvecnss chive nase tecno acia 4 1 To Start MeasureMeldtc ooccocnnccnccncnnnconconcnnconccncnancancanccncaninass 4 1 To View or Configure User SettidgsS oooccoooccnnnccnnnnccnnnronanoss 4 2 To View Instrument Status ocooccoccnconcnncnncnncnnncancanconccnanannnno 4 3 Computer Control eriein to Ani 4 4 Using Aerosol Instrument Manager Software 06 4 4 Using Other Software ccoooccnonccnnnoccnnnncnoncnnnnncnnonccnonaronnnncnnns 4 4 CHAPTER 5 Aerosol Instrument Manager Software 5 1 Installation Requirements ooccnoccnccnnoccnnnnnuncnnanonaconccnncanananoso 5 1 Installation oi a ie A ene soe neta 5 2 ca O 5 3 Start the PELOTA ida ot eii sentences 5 3 Open an Existing File coordenadas penca ao ia 5 4 Change How Data is Viewed oocccoccnoccnoconoconaconaconacananananes 5 5 View Another Sample in the Same File 0 0 0 0 ees 5 6 Playback Review Data Samples coocccoccnoccnoconoconiconaconanos 5 6 Select a Data Ho
20. tandem differential mobility analysis C 2 technical contacts 8 1 testing for leaks 6 4 theory of operation B 1 toolbars 5 36 total flow light troubleshooting 7 1 total sample time 5 15 troubleshooting 7 1 tube furnace C 1 two panel layout of aerosol electrometer file 5 13 U undelete delete samples 5 9 undo zoom 5 31 5 41 unpacking 2 1 unstable zero offset level 7 3 USB port 3 4 5 2 location 2 4 USB status 4 4 user setting menu 4 2 V vacuum connecting 2 3 source 4 1 valve duty cycle 4 3 view another sample in same file 5 6 view boundaries 5 28 5 41 view data values 5 8 view instrument status 4 3 view menu 5 32 copy 5 35 graph 5 32 screen 5 32 settings 5 34 statistics 5 34 table 5 32 toolbars 5 36 view user settings 4 2 Visual Basic software 4 4 W X warm up time A 1 warning xiii description xv symbol xvi warranty v weight A 1 window menu 5 37 dialog box 5 38 Y y axis dialog box 5 28 Z zero offset level unstable 7 3 zero offset reset menu 4 3 zero the electrometer 5 36 zoom in zoom out 5 9 Index 5 Reader s Comments Sheet Please help us improve our manuals by completing and returning this questionnaire to the address listed in the About This Manual section or e mail your comments to particle tsi com Feel free to attach a separate sheet of comments Manual Title Model 3068B Aerosol Electrometer P N 1930077 Rev A 1 Was the ma
21. that the port items indicated in the message is not in use by another application Cannot find a file lt filename gt in the sequence of files Warning to let you know that the sequence of files has associated with lt filename gt Only the samples loaded a gap and the program cannot load all of the files will be available The connected instrument is not a 3068B Verify instrument configuration There is no data remaining There is no more data left in the file after samples marked for deletion have been removed Fixed Scale is selected You must select a Minimum If you want to use the fixed scale parameter you must and or Maximum value select a minimum or maximum value Log y scale is invalid because the minimum y scale You have tried to select log Y scale and you also have 0 value is set to O as the fixed minimum value You cannot have both selected Change one Maximum value must be gt minimum value You have entered a minimum value that is greater than the maximum value Reenter the correct values File Missing One of the files in a sequence cannot be found Sample x will be discarded and cannot be recovered Answer yes if you want to permanently remove the Do you want to discard it sample from the file The instrument is reporting Sample Flow Error Select Yes to start sampling or select No if you do not Do you want to start sampling anyway want to start sampling at this time Unable to read instrument stat
22. the back panel has a USB a serial and an analog output port an external vacuum tube a sample inlet a filter access cover a power connection and an on off switch AC Power Connector and On Off Switch The AC power connector accepts the line cord supplied to provide AC power to the instrument See Power Connection in Chapter 2 for more information The on off switch turns the aerosol electrometer on or off For Service and information Contact TS Customer Service www tsl com or 4 00 Carsigan Rood ms TSI soreview un sna USA la Serial Caution To avoid electrical shock the power gt 49 cord protective grounding conductor must be connected lo earth ground Se gt Sample Inlet a Figure 3 3 Back Panel of the Model 3068B Aerosol Electrometer Serial Port The Electrometer has a single RS 232 serial port that can be used to communicate with a computer using a standard 9 pin serial cable See Appendix D Serial Commands for a detailed explanation Note If both RS 232 and USB are connected the USB will be automatically used USB Port The USB Universal Serial Bus port provides an interface to communicate with a computer using TSI software See section Model 3068B Aerosol Electrometer Using Aerosol Instrument Manager Software in Chapter 4 This port is USB version 2 0 compatible and supports full speed mode Note Connecting the USB disab
23. this chapter Note If a start time is set this menu item and its associated icon is disabled Model 3068B Aerosol Electrometer Once you select Start Data Collection sampling begins immediately As data is collected it is displayed in the open windows Finish Current Sample Select Run Finish Current Sample when you want to stop collecting sample data prematurely Before completing all samples as set in the Properties dialog When you select this item the current sample is allowed to finish before sampling ends Stop Current Sample Select Run Stop Current Sample or O on the toolbar when you want to stop collecting sample data immediately When you select this item sampling stops and data collected to this point is stored in the data file Abort Current Sample Select Run Abort Current Sample when you want to abort data collection Aerosol Instrument Manager automatically saves the data to the file every 5 minutes therefore once data has been written to the file this menu item is unavailable You must then stop the current sample and then delete the sample see description under Sample Menu in order to discard the data Otherwise selecting this item prior to five 5 minutes of sample time stops sampling and the data for the current sample is discarded Connect to Instrument Select Run Connect to Instrument to connect the software to the Aerosol Electrometer You must connect before you can begin sampling
24. to open a new file and prepare to collect sample data After you select New you are prompted to enter a filename Accept the default filename or enter any filename you chose then select OK A Samples List window and a graph window open on the desktop with the filename you entered and you are ready to start collecting data Refer to How to Collect Sample Data earlier in this chapter for a complete description Aerosol Instrument Manager Software 5 21 Open Select File Open or El on the toolbar to open an existing file By default sample files are stored in the same directory as the Aerosol Instrument Manager program All files will automatically be given the appropriate filename extension according to the sensor model you are using see above description If you store data files in another directory or on another drive you must first display the file pathname in the Open window before you can select and open it Note When opening files for sample sessions that run past midnight refer to the description of Sequence Files in Appendix G and for information on how the files are opened When the file opens a window opens on the Aerosol Instrument Manager desktop containing data from the first sample in the file You can have many samples and many files open on the desktop at the same time Only one window however is the active window Close Select File Close or et to close a file and all the windows associated wi
25. toolbar If you want to select a start time check the box and enter the clock time at which you want sampling to begin The program uses a 12 hour or 24 hour clock depending on how your PC is set up If your PC is set up to use a 12 hour clock you must indicate if the time is AM or PM by leaving the PM box blank or checking the PM box The reference time for the program is the time at which your computer is set Files of Sample Sessions That Run Past Midnight The files for sample sessions that run past midnight are handled differently than those that start and stop on the same date In this case a sequence of files is created with each file in the sequence given a unique filename extension identifying its proper order Appendix G provides a complete description of sequence files including how to access a file that is part of a sequence The software provides an auto save feature for sample times greater than 300 seconds 5 minutes Intended to prevent data loss in the event of a computer failure power loss etc this feature automatically writes the sample data to the data file after each 5 minute interval The maximum data loss is less than 5 minutes Settings Tab The Settings tab Figure 5 9 allows you to specify a sample flow set point and average particle charge You may also view the current offset read from the instrument the instrument ID add a title for the sample and include any comments about the sample
26. 2 connectors 3 1 contacting TSI 8 1 email address v getting help xix submitting comments xix context sensitive menus 5 38 controls 3 1 copy 5 35 5 41 5 43 count accuracy A 1 counting efficiency curve of 3772 C 3 CPC properties 5 14 USB port 5 2 current zero offset 4 4 customer service 8 1 D data average time setting menu 4 3 data dynamic range A 1 data files E 1 data hotspot select 5 8 data table 5 33 delete undelete sample 5 9 5 37 description of system B 2 desktop 5 3 menus 5 21 differential mobility analyzer C 1 digital I O output A 2 dimensions A 1 disconnect from instrument 5 25 display 3 2 display as 5 41 5 42 display selected samples 5 39 5 40 drift stability A 1 E electrometer current 1 3 5 11 Electrostatic Classifier 1 1 ending sample 5 37 environmental conditions A 2 error messages 7 1 H 1 example files 5 4 experimental setup for CPC calibration C 3 export 5 23 5 39 export data 5 11 automatically 5 12 manually 5 11 export parameters box 5 11 extensions CPC 5 19 external vacuum A 2 connector 4 1 tubing 3 5 Index 2 F Faraday cup B 1 femtoAmp 1 2 file menu 5 21 close 5 22 exit 5 24 export 5 23 import 5 23 list of recently accessed files 5 24 new 5 21 open 5 22 print 5 23 print preview 5 23 print setup 5 24 properties 5 23 save 5 22 save as 5 23 file menu options screen 5 21 file parameters E 1 filter 6 3 filter
27. 6 MB or more of random access memory RAM A mouse and a keyboard Pentium is a registered trademark of Intel Corporation OMicrosoft Windows 2000 and Windows XP are registered trademarks of Microsoft Corporation 5 1 Installation 5 2 A RS 232 serial interface port or a USB port for each instrument connected in addition to the one that may be required for the mouse A Microsoft Windows compatible printer is optional Install the Aerosol Instrument Manager software as follows 1 4 Shut down exit all programs applications on the Windows desktop With the computer on and Windows running insert the Aerosol Instrument Manager CD ROM in your CD drive to run the autorun exe from the CD a If AutoPlay is enabled on your PC the setup program will begin automatically and the introduction screen will be displayed on the Windows desktop b If AutoPlay is not enabled select Run from the Start menu and type D lautorun where D is the letter corresponding to your CD drive in the Open box and press OK Follow the instructions as the setup program runs When setup is complete you should read the readme htm file The readme htm file contains information that could not be included in this manual If you decide not to read the file immediately you can access the file later using a browser such as Internet Explorer When the installation program finishes remove the CD ROM The setup program create
28. 7 1 Aerosol Instrument Manager Software 390065 Power cord listed is for U S A use only Appropriate power cord will be provided for different regions Unpacking Instructions The Model 3068B is shipped fully assembled To begin using the instrument 1 Remove the protective caps from the Sample Inlet the External Vacuum the BNC connector and the serial port The caps should be saved for leak checking use or whenever packing the instrument for shipment 2 Insert the appropriate power cord into the back of the instrument and turn it on using the switch next to the power entry port Moving the Instrument The Model 3068B Aerosol Electrometer is small and light enough that it can be easily moved by gripping the bottom of the instrument on both sides and lifting Mounting the Instrument The Aerosol Electrometer has no special mounting requirements other than providing enough space around the cabinet for heat dissipation by the cooling fan Allow at least one inch 2 5cm clearance one either side of the cabinet for adequate cooling The cabinet has four non marking rubber feet that give the instrument a good grip on clean level surfaces The rubber feet are installed in the cabinet using integrated 8 32 UNC threaded fasteners and can be removed by unscrewing to allow other mounting fasteners to be used Power Connection Connect the AC power cord supplied to the AC Power In connection on the back of the Electrometer an
29. Incoming Charged Particles lt gt A o oe OO YS Ss PRPS AS etetett SSS AAA E ra x rote es e oxo gt Exhaust Flow os A 2 OS leS RRA ccs A A tato Meters IO OO Electrometer OS BEE RS LISIS RSS Metal Housing Output de gt ERAS rece Sx q 5252 gt gt iS Faraday Cup Ground Figure B 1 Principle of an Aerosol Electrometer B 1 System Description Figure B 2 shows a schematic diagram of the Model 3068B Aerosol Electrometer Charged aerosol enters the instrument through an outer metal housing which shields the Electrometer input from stray electric fields An absolute filter removes the charged particles from the air stream The filter is enclosed in an inner metal housing and insulated from the outer metal housing A signal feedthrough connects the filter to the input of a solid state electrometer amplifier The Electrometer has an analog output voltage range of O to 10 volts corresponding to a maximum current range of 12 5 to 12 5 picoamperes The RMS noise current of the Electrometer is less than 1 femptoamp 1 x 10 15 amperes with a one second averaging time The current I A measured by the Electrometer is related to the input aerosol concentration N particle cm by equation 1 I N np Ge 1 where n is the average number of elementary charge units per particle e
30. N 3929408 and a union compression fitting P N 1601052 are provided in the accessory kit to connect the vacuum port on the Aerosol Electrometer to a vacuum system or pump Note Automatic flow control is provided for flexibility However the instrument uses a volumetric flowmeter Due to the pressure drop through the electrometer filter the accuracy of the flow control is limited to 2 up to 2 L min and 5 up to 10 L min More accurate flow control and therefore a more accurate measurement is possible by setting the flow control to manual mode and using an external needle valve or critical orifice to control the flow Do not apply a vacuum to the Sample Inlet A flow in the reverse direction can potentially damage the small poppet inside the solenoid valve Connecting to the Aerosol Source Connect the Sample Inlet to the aerosol source Make sure that the inlet pressure is higher than the outlet pressure so that the flow is not in the reverse direction This instrument has been tested in the pressure range from 25 below to 25 above one atmosphere Contact TSI if you want to operate the Electrometer at pressures out of this range Unpacking and Setting up the System 2 3 Connecting to the Computer The Electrometer provides a standard RS 232 serial port and a USB port to allow for flexible data collection and instrument control The user can connect the Electrometer to a computer computer must be using Microsoft Windows
31. When you select File New the software automatically connects to the Aerosol Electrometer Disconnect from Instrument Select Run Disconnect from Instrument to disconnect the software from the Aerosol Electrometer Auto Export Select Run Auto Export to automatically export data for use in another program Refer to Export Data to a File earlier in this chapter for additional information Properties This menu item provides a shortcut to the same Properties menu item listed under the File menu and appears here for convenience Select Run Properties to display the Properties dialog that lets you set and view the parameters used by the Aerosol Instrument Manager software for each sample Aerosol Instrument Manager Software 5 25 5 26 The parameters that can be set are described earlier in this chapter Playback Menu The Playback menu appears only when a Samples List window is active on the desktop Its purpose is to allow you to display graphic and table windows in series like a slide show so that you can compare samples or view a series of samples Figure 5 14 Playback Menu Refer to Playback Review Data Samples earlier in this chapter for instructions Play Select Playback Play or gt from the toolbar for playing back the samples you selected First select the time you want each sample displayed full speed 0 5 1 0 2 5 or 5 0 seconds Then select whether to view the s
32. able 5 7 Statistics View Popup Menu Menu Item For a description see Color Format Menu Font Format Menu Abort current sample Run menu Copy View Menu Print File Menu Print Preview File Menu Status Bar Icons A status bar at the bottom of most windows provides information about what is being shown in the window as well as information about what operations are occurring Each icon is described below Icon Description Attention Errors were detected You may float the A mouse over the icon to display popup text describing the errors OK The sample completed without errors Aerosol Instrument Manager Software 5 43 CHAPTER 6 Maintenance This chapter gives maintenance and service procedures for the Model 3068B Aerosol Electrometer Calibration and Performance Each Aerosol Electrometer is calibrated at the factory by comparison with a factory standard Aerosol Electrometer while sampling the output of a Model 3080 Electrostatic Classifier All new and repaired Aerosol Electrometers must agree with the factory standard within 2 percent Periodic Maintenance Periodic cleaning of several portions of the Aerosol Electrometer is necessary to ensure proper performance Accumulation of aerosol deposit on the insulator in the Electrometer aerosol filter assembly will cause current leakage to ground resulting in incorrect current measurement Clogging of the high effi
33. al Model 3068B Aerosol Electrometer Electrometer Current and Calculated Particle Concentration Data is collected from the instrument and may be displayed as either electrometer current or calculated particle concentration cm every second and averaged for each averaging interval The particle concentration is based on a user entered value for average charge This manual assumes you have Microsoft Windows 2000 or Windows XP operating system on your computer and that you are familiar with how Windows works If you are not familiar with Windows please refer to the information that came with it before you load and use this program Microsoft and Windows registered trademarks of Microsoft Corporation Product Overview 1 3 CHAPTER 2 Unpacking and Setting Up the System Use the information in this chapter to unpack and setup the Model 3068B Aerosol Electrometer Packing List As you unpack the shipping container make certain the shipment is complete Table 2 1 gives a packing list for the Electrometer Table 2 1 Aerosol Electrometer Packing List Qty Description Part No 1 Model 3068B Aerosol Electrometer 306810 1 Power cord 100 120 VAC 1303053 1 Cable 9 pin serial M F 12 feet 962002 1 USB Cable I O A B 1303740 1 Filter wire core microfiber 1602346 10in TU Tygon 2057 Butyl 0 312 OD x 0 187 ID 3900030 12 ft Y inch polyflo tubing 3929408 1 Union Compression fitting 1601052 1 User s manual 193007
34. amples once or continuously As soon as you select Play Once or Play Continuous each sample selected for playback is displayed in the open views for the specified time period until all the samples have been displayed If you selected Play Continuous from the Playback Setup dialog box the series repeats itself indefinitely Pause Select Playback Pause or u from the toolbar to interrupt the playback of the samples This feature lets you stop playback to view the data of an interesting sample without canceling the playback of all selected samples When you want to start playback again select Playback Play Stop Select Playback Stop or O from the toolbar to end sample playback before all samples have been displayed If you select Stop and you want to restart sampling you must select Playback Play select the display time for each sample and begin displaying samples from the first selected sample Model 3068B Aerosol Electrometer Format Menu The Format menu has several variations depending on the active window The menu items of the Format menu let you control how information is presented in tables and graphs including graph type grid lines font color etc when a graph or table window is active When a Samples List window is active on the desktop the menu items of the Format menu let you determine how items in the Samples List window are displayed You can select large or small icons or list the samples with or without
35. art number 1933792 TSI Incorporated Model 3772 3771 Condensation Particle Counter part number 1980529 TSI Incorporated Model 3775 Condensation Particle Counter part number 1980527 TSI Incorporated Model 3776 Ultrafine Condensation Particle Counter part number 1980522 TSI Incorporated windows is a registered trademark of Microsoft Corporation xviii Model 3068B Aerosol Electrometer Getting Help To obtain assistance with this product or to submit suggestions please contact TSI Particle Instruments TSI Incorporated 500 Cardigan Road Shoreview MN 55126 U S A Fax 651 490 3824 Telephone 1 800 874 2811 USA or 651 490 2811 E mail technical service tsi com Web site www tsi com Submitting Comments TSI values your comments and suggestions on this manual Please use the comment sheet on the last page of this manual to send us your opinion on the manual s usability to suggest specific improvements or to report any technical errors If the comment sheet has already been used send your comments to Particle Instruments TSI Incorporated 500 Cardigan Road Shoreview MN 55126 U S A Fax 651 490 3824 E mail Address particle tsi com Web site www tsi com About This Manual xix CHAPTER 1 Product Overview This chapter describes the Model 3068B Aerosol Electrometer shown in Figure 1 1 and gives an overview of how this instrument works Product Description The Model 3068B Aero
36. ation for information about the Print dialog box Print Preview To avoid printing something you don t want select File Print Preview or l to see what your printed output will look like before selecting Print Aerosol Instrument Manager Software 5 23 Print Setup Select File Print Setup to set up the printer for printing Refer to your Windows documentation and your printer s documentation for information about setting the printer parameters List of Recently Accessed Files Between the Printer Setup and Exit menu items is a list of the most recently accessed data files a maximum of four files is displayed These are accessed from the menu by selecting File 1 2 3 or 4 The list provides a shortcut to these files so you can bypass the Open command To open one of the files listed use the mouse to highlight it and then click the left mouse button The file opens on the desktop Exit Select File Exit to end the program Run Menu The items available under the Run menu are used to start and stop data collection AAA Figure 5 13 Run Menu for an Aerosol Electrometer Start Data Collection With a new file open on the desktop select Run Start Data Collection or e on the toolbar to begin collecting sample data Samples are collected according to the sample length number of samples scheduled times averaging interval and other parameters set in the tabs of the Properties dialog see earlier in
37. ay the sample data in an active window on the desktop To export data from multiple samples select highlight the samples you want to export from the Samples List window 2 Select File Export An Export Parameters box appears as shown in Figure 5 6 Select Data to Export IV Electrometer Current Sample Flow Output File Type Extension xls Delimiter Tab C csv C Comma C be C Semicolon Output File Name an az sive le Loma Figure 5 6 The Export Parameters Box 3 Select the data you wish to export You may select Electrometer Current Calculated Concentration and or Sample Flow 4 Select the extension for the file you want to export data to You can select from three delimiters comma tab or semicolon It is recommended to use Tab as the delimiter if you choose xls as the file extension Aerosol Instrument Manager Software 5 11 5 After selecting the export parameters if you would like to specify an alternate output file name press the Save As button 6 Ifyou press the Save As button a file save dialog will open From here select the drive directory you want to export the data to in the file dialog box and enter a filename The system automatically adds the file extension to the file that you have selected Press Save This file name will appear under the Output File Name in the export options dialog 7 Press OK To Export Data to a File Auto
38. bed below 1 High Voltage Symbol Label interior bottom left on power entry module 2 Ground Symbol Label interior bottom left next to ground stud 3 High Voltage Symbol Label interior left on power supply 4 Serial Number Label back of cabinet xiii xiv 5 Caution No Serviceable Parts Label back of cabinet 6 Customer Service Label back of cabinet Figure S 1 Location of High Voltage Symbol Labels and Ground Label Figure S 2 Location of High Voltage Label on the Power Supply Module Model 3068B Aerosol Electrometer To avoid electrical shock the power Ad as amp cord protective grounding conductor must be connected to earth ground AC Power In Analog E we 100 240 VAC Output Sample Inlet 50 60 Hz 60W External D Vacuum E Y Figure S 3 Location of Serial Number and Customer Service Labels Description of Caution Symbol The following symbol and an appropriate caution statement are used throughout the manual and on the Model 3068B to draw attention to any steps that require you to take cautionary measures when working with the Model 3068B Caution Caution means be careful lt means if you do not follow the procedures prescribed in this manual you may do something that might result in equipment damage or you might have to take something apart and start over again It also indicates that important information about the operation and maintenance of this instrumen
39. ber of samples you want to collect The maximum value allowed is 65535 Total Sample Time This field is calculated by the software and shows the total sample time based on the values you entered in the Sample Length and Number of Samples boxes The value is displayed in hours minutes and seconds Note that when multiple samples are collected the total sample time is longer than the Sample Length x Number of Samples Extra overhead time is needed to open sample data files transfer and save data and close data files Aerosol Instrument Manager Software 5 15 5 16 Averaging Interval This is the number of seconds of data collected Sec that will be averaged together to make up one data point The number of data points in a sample is equal to the Sample Length Averaging Interval The maximum number of data points allowed for a sample is 28 800 For an Aerosol Electrometer the minimum and default averaging interval is 1 second Scheduled Select Only Once to collect one set of samples For continuous monitoring select Repeat Every and then select the hours and minutes between samples Note that extra overhead time is needed for file handling so the time selected for continuous monitoring should be longer than the total sample time which includes some overhead time Start At Time If you don t check this box sampling begins as soon as you select Start Data Collection from the Run menu or by pressing the start button on the
40. ciency filter will result in high pressure drop through the system causing error in the measurement of volumetric flow rates The service intervals depend on the aerosol concentration entering the unit Table 6 1 Maintenance Schedule Maintenance Task Hours of Operation Replace the aerosol filter cartridge Every 1000 4000 hrs of operation Check the flowmeter Every 1000 2000 hrs of operation 6 1 Replacing the Filter Cartridge and Cleaning the Electrometer Make sure you unplug the power source before removing the cover or performing maintenance procedures Only a qualified technician should perform this maintenance High voltage is accessible in several locations within this instrument A special filter with a wire mesh incorporated into the inner surface is used as the charge collector in the electrometer The wire mesh allows the current from captured particles to bleed off the filter in a reasonable time With use the filter will become clogged with particles from the sampled aerosol and have to be replaced Follow the steps below to replace the electrometer filter and Information or Servic union g oy TSI x N q s To avoid electrical shock the power cp cord protective grounding conductor must be connected to earth ground Figure 6 1 Electrometer Chamber Cover Screws 1 Switch off the electrometer and disconnect the electric power cable Unplug tubes to the Sample Inlet and External Vacuum
41. cococcnnonococcnnonococonos G 1 Opening a File That is Part of a Sequence ooooccccnccnnincnnncnnnnn G 2 APPENDIX H Error Messages cesceccscecceccsceccccccccsceeces H 1 Index Reader s Comments Sheet S 1 Location of High Voltage Symbol Labels and Ground Labra A AO Besa hes ewe xiv 1 1 Model 3068B Aerosol Electrometer ooooococonononcnrncncnnancnonoso 1 1 2 1 Location of Serial and USB Ports cccceccececeeeeseeeeeeees 2 4 3 1 Front of the Model 3068B Aerosol Electrometer 3 1 5 1 The Aerosol Instrument Manager Desktop ccocccocccncccninnn 5 4 5 2 Graph View Popup Men s seriero iinan riein 5 5 5 3 Playback Setup Dialog BOX coocccocccoconoconoconaconacinnncnnacanicon 5 7 5 4 Use the Mouse to Directly View Data Values AE sample fleas tii be 5 8 5 95 Print PREVIEW ia a an 5 10 Contents ix 5 6 The Export Parameters BOX ooccooccnoccnoccnncnncnnnccnnacaniaconicanaso 5 11 5 7 Two Pane Layout of an Aerosol Electrometer File 5 13 5 8 Scheduling Tab of the Properties Dialog Box 5 15 5 9 The Settings Tab of the Properties Dialog Box 5 17 5 10 The Communications Tab of the Properties Dialog Box for an Aerosol Electrometer oooccconnccnncccnnnccnnnoccnnnnononicnnnns 5 18 5 11 Communications Error Message coocccoccnocnnoconiconiconacinanes 5 20 5 12 File Menu Options for an Aerosol Electrometet 5 21 5 13 Run Men
42. ct Sample Delete Undelete Sample or X on the toolbar The samples will be shown as Deleted However they will not be permanently removed from the file until you Save the file Save the file and permanently delete all samples marked for deletion 1 With at least one sample marked for deletion in the active file select File Save You will get a message stating Some samples have been marked for deletion Do you want them permanently removed Click Yes to remove them or No to keep them 2 Select Yes The files marked for deletion are permanently deleted Note A message will appear to remind you to save the file when you close the file or exit the program If you click Yes the same message stating Some samples have been marked for deletion Do you want them permanently removed will appear Respond Yes to delete the marked samples and No to close the file without deleting them Zoom In and Out on Data in a Graph You can zoom in on data displayed in a graph as follows 1 Use the mouse to position the cursor pointer at one corner of the area you want enlarged 2 Press down on the left mouse button and drag the mouse to the opposite corner of the data you want enlarged 3 Release the left mouse button The area you selected is enlarged 4 You can continue to zoom further by repeating steps 1 through 3 UNDO To Unzoom select Format Undo Zoom or 2 on the toolbar The enlarged area is returned to
43. d DYH Pui 1979 Automatic Analysis of Submicron Aerosols Chapter in Aerosol Measurement D A Lundgren M Lippmann F S Harris Jr W E Clark W H Marlow editors University of Florida Press Gainesville Florida Stolzenburg R and PH McMurry 1991 An Ultrafine Aerosol Condensation Nucleus Counter Aerosol Sci Technol 14 48 65 Model 3068B Aerosol Electrometer 12 Sverdrup GM 1977 Parametric Measurement of Submicron Atmospheric Aerosol Size Distribution Ph D Thesis Mechanical Engineering Department University of Minnesota Minneapolis Minnesota Theory of Operation B 5 APPENDIX C Applications Notes One of the primary uses of an electrometer is to characterize Condensation Particle Counters This section gives recommendations for such experiments This section is written for technicians with experience in using particle generation and measurement equipment All safety and good laboratory practices should be observed Characterizing Lower Counting Limit Condensation Particle Counters CPCs are characterized by their lower counting limit smallest particles detected This is typically not a single value but an efficiency curve The CPC counting efficiency curve can be obtained by taking the concentration ratio of the CPC to the electrometer measuring the same aerosol side by side for a series of particle sizes A typical CPC calibration setup is shown in Figure C 1 Test aerosols are genera
44. d then into an available power outlet The instrument accepts line voltage 100 to 240 VAC 50 60 Hz 160 W maximum single phase The connector has a built in on off switch Notes Make certain the line cord is plugged into a grounded earth grounded power outlet Position the Electrometer so the power cord connector is not blocked and is easily accessible The Electrometer power supply contains no user serviceable parts If the power supply is not operating correctly use the information in Chapter 8 to contact TSI This instrument should not be used in a manner not specified by the manufacturer Toggle the power switch to the on position to verify the instrument has power 2 2 Model 3068B Aerosol Electrometer Connecting to Vacuum The Aerosol Electrometer is designed to operate with sampling rates up to 10 L min The Model 3068B has a built in automatic proportional control valve controlled by a microprocessor and a TSI 4140 Flowmeter to measure and control flow over the range of 0 3 10 L min The pressure drop across the instrument is about 114 cm 45 in of water at a flow rate of 10 L min For laboratory use the system can often be connected directly to an existing vacuum source in the laboratory If this is not feasible use a TSI Model 3033 Vacuum Pump or Gast Model 0522 oil less vacuum pump for this purpose Avoid piston or diaphragm pumps because they produce pulsing flow that causes greater measurement errors Rigid tubing P
45. e see Figure 5 18 You can select any font and font style available on your computer The preview box lets you see what the text will look like before you implement it by selecting OK Font X Font Font Style pa OK f eu K Cancel Arial Black g italic Tr Arial monospaced for Bold O Arial Narrow x Bold Italic E Sample Figure 5 18 Font Dialog Box To change the font size select Format Font Small Medium or Large the default is Medium To change the text size without using the menus select the A icon from the toolbar Each time you select the icon the text size changes to the next text size Rotation is from small to medium to large Undo Zoom Select Format Undo Zoom or S from the toolbar to return a graph to its normal viewing size after you have zoomed in on a portion of the graph See Zoom In and Out on Data in a Graph earlier in this chapter Aerosol Instrument Manager Software 5 31 View Menu The list of items in the View menu depends on which windows are open on the desktop and which one is active The View menu lets you select the sample windows to open on the desktop and select parameters to view in those windows A checkmark next to an item indicates the item has already been selected Look under the Windows menu to find the item and make it the active window View Sample Window Help Graph F6 Table Shift F6 Statistics F3 Settings Cop
46. e of the item you want to modify The current color for that item is indicated in the color palette Use the mouse to point to the new color for that item and click the left mouse button to select it The preview screen then displays the item in the new color Aerosol Instrument Manager Software 5 29 Color Object Window Background v EEEE DEET A EA A El EE IA E A ad ey a ee la PRR SE Se eS ee Basic colors Gey eee AmE ie E A EEE ESE ee EE EEE eee ee a Figure 5 17 Color Object Window Background fd e A Abe Abc Abe Abc A 3 B Abc Ake Abc Abe EE BE eee E A il le Cancel A The Graph Color Dialog Box B The Table Color Dialog Box Select items from the drop down list and colors as desired When finished press OK the colors you selected will be used from that point on in all graphs and or tables The items you can select for windows containing graphs are Window Background Plot Area Background Labels Axis Data View Boundaries O DOD 0 0 UO CO O Data Hotspot Lines 5 30 Model 3068B Aerosol Electrometer The items you can select for windows containing tables are Q Window Background Q Cell Text Q Grid Color Q Cell Background Q Fixed Area Text Font Select the Format Font menu or Al from the toolbar to change the style and size of the text in all graphs or tables Select Format Font Style to select a new font or change the font styl
47. ed Notes If the View Boundaries are active and a View Boundary is not visible on the left move the mouse cursor to the far left edge of the chart and drag it to a displayable part of the chart If the chart is zoomed the view boundaries may not be shown on the chart without scrolling Graph Type Select Format Graph Type to select the type of graph to display in the active window The options are bar line area or points plus line Ifthe Graph toolbar is visible you can select the option using the appropriate icon Las Display graphs using bars la Display graphs using lines la Display graphs showing area Model 3068B Aerosol Electrometer Grid Lines Select Format Grid Lines to select the lines for the graph in the active window The options are horizontal vertical both or none If the Graph toolbar is visible you can select the option using the appropriate icon L Display graphs with no grid El Display graphs with a horizontal grid u Display graphs with a vertical grid E Display graphs with both horizontal and vertical grids Color Select Format Color or from the toolbar to change the colors used to display items in the active window When you select Format Color the Graph Color or Table Color window opens depending on the active window on the desktop Figure 5 17 shows both These windows include a preview screen a drop down list and a color palette From the drop down list select the nam
48. ent b Parts repaired or replaced as a result of repair services are warranted to be free from defects in workmanship and material under normal use for 90 days from the date of shipment c Seller does not provide any warranty on finished goods manufactured by others or on any fuses batteries or other consumable materials Only the original manufacturer s warranty applies d Unless specifically authorized in a separate writing by Seller Seller makes no warranty with respect to and shall have no liability in connection with goods which are incorporated into other products or equipment or which are modified by any person other than Seller The foregoing is IN LIEU OF all other warranties and is subject to the LIMITATIONS stated herein NO OTHER EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR PARTICULAR PURPOSE OR MERCHANTABILITY IS MADE TO THE EXTENT PERMITTED BY LAW THE EXCLUSIVE REMEDY OF THE USER OR BUYER AND THE LIMIT OF SELLER S LIABILITY FOR ANY AND ALL LOSSES INJURIES OR DAMAGES CONCERNING THE GOODS INCLUDING CLAIMS BASED ON CONTRACT NEGLIGENCE TORT STRICT LIABILITY OR OTHERWISE SHALL BE THE RETURN OF GOODS TO SELLER AND THE REFUND OF THE PURCHASE PRICE OR AT THE OPTION OF SELLER THE REPAIR OR REPLACEMENT OF THE GOODS IN NO EVENT SHALL SELLER BE LIABLE FOR ANY SPECIAL CONSEQUENTIAL OR INCIDENTAL DAMAGES SELLER SHALL NOT BE RESPONSIBLE FOR INSTALLATION DISMANTLING OR REINSTALLATION COSTS OR CHARGES No Action regardle
49. es in the Samples List window for playback or exporting This item is only available when the Samples List window is the active window Window Menu The Window menu items let you open close and arrange the windows on your desktop Refer to Arrange Open Windows earlier Aerosol Instrument Manager Software 5 37 5 38 in this chapter and your Windows documentation for an example of what each command does Window Help 2 Pane Layout Ctri K 4 Pane Layout Ctd L Cascade Tile Horizontal Tile Vertical Close All 1 Data Graph AIM1 E68 2 Data Table AIM1 E68 3 Statistics Table AIM1 E68 y 4 Blectrometer Samples List AIM1 E68 Figure 5 25 Window Menu All windows on the desktop whether active or inactive are listed after the Close All command the active window is shown with a check mark To make a different window active and bring it to the front select it with the mouse Help Menu The Help menu provides access to information about the program Help Help Manual F1 Figure 5 26 Help Menu About Aerosol Instrument Manager Select Help About Aerosol Instrument Manager to see the copyright statement for the program and view the version number of the software Help Manual Select Help Help Manual to see this manual You must have Adobe Acrobat reader installed on your computer to view this file Context Sensitive Menus You can access context sensitive menus also called popup men
50. ese seen seen es 7 2 Unstable Zero Offset Level arisi nos bieran ine Et erea AEAN NS 7 3 viii Model 3068B Aerosol Electrometer Figures CHAPTER 8 Contacting Customer Service scsccesseees 8 1 Technical Contacts ini as 8 1 Returning the Aerosol Electrometer for Service 8 1 APPENDIX A Model 3068B Specifications secseeees A 1 APPENDIX B Theory of Operation cscsscscscscsceceeeees B 1 How the Aerosol Electrometer Operates ccoocccocccoccniccnuncnnicono B 1 System DeScriptiON si cvconsonons eecesediee eset ines tees innatas B 2 Selected Referencia B 3 APPENDIX C Applications Notes ccceccscscscsceccscecsceees C 1 Characterizing Lower Counting Limit cccoccncccnccnncnnncnnnic n C 1 Characterizing Concentration Linearity oooccocccnccnnccnnonnnicon C 4 APPENDIX D Serial Comman cccccececccececececscesseeees D 1 Pin CONN ECCOTS id da Vendors cape NERSE na Tka RE TEKERT D 1 Serial PEO OCO limi lao ance ei a ae ees D 2 Serial Command mit ta asec beads D 2 APPENDIX E Data Files Project Files and Stored PATAMETCETS ecceccccccsccccceccccecceccececcecceceecescescecceseesessees E 1 Data Files and Project Files 2 0 0 0 cece sce ceee cece eeee seen eeees E 1 Project File Parameter Sven aa E E 2 Saved Parametros E 3 APPENDIX F Accelerator KeyS oooococoncoconononcocononccconoconcnconos F 1 APPENDIX G Sequence Files ooooococo
51. esponse curve would be 1 1 throughout the concentration range for large particles that are fully activated in the CPC and with negligible diffusional losses In reality the slope might deviate due to particle losses small particles failing to activate and or coincidence error The experimental setup for linearity test is the same as that in Figure C 1 The DMA is used to select a particle size that lies in the flat portion of the counting efficiency curve larger size end Particle concentration is increased from low concentration to the concentration limit of the CPC with incremental steps of 2000 particle cm by adjusting the dilution bridge The CPC concentration linearity is obtained by fitting the experimental data with CPC concentration in y axis and electrometer concentration in x axis to a straight line Figure C 3 shows an example of the Model 3772 CPC linearity result The data was taken with 40 nm sucrose particles 10 000 a SN1 SN2 SN3 gt Slope 0 9508 0 9682 0 9317 R 0 9995 0 9997 0 9998 S a pu e O o e O oO O a oO 1 000 1 000 10 000 Electrometer Concentration cm Figure C 3 Concentration Linearity Result of the Model 3772 CPC C 4 Model 3068B Aerosol Electrometer APPENDIX D Serial Commands This section is for advanced users that need to communicate with the Model 3068B for advanced calibration troubleshooting or diagnostics This section is written for technician
52. eter Chamber Cover ScreWS oooccooccncccnccnnccnnccnninon 6 2 6 2 Electrometer Filter Insulator and Spring Wire 6 3 7 1 Location of the Flat Cable Connected to the Hlectrometer SENSOL 3 orere anoto atacan cows caus te e EREU ENE iae 7 2 B 1 Principle of an Aerosol Electrometer ooooocccccncnnnnonononnnennnnnns B 1 C 1 Experimental Setup for CPC Calibration oooccccccccnnncnnnnos C 3 C 2 Counting Efficiency Curve of the Model 3772 CPC C 3 C 3 Concentration Linearity Result of the Model 3772 CPC C 4 D 1 Connection Description ccoonccnnonnnenconenonnnnnnonnnanonanocnnannnns D 2 D 2 Connect To a Serial POlTt ooocccoooonccnnnnocnnnnnnnonnnnnnnononnnnninnnnnns D 3 1233 POLE oe UNIS anie ATEN D 3 DA ASCH Setu Dani ic NE N A D 4 D 5 Help Commands List cece ec iii aaa D 5 Model 3068B Aerosol Electrometer Tables 2 1 3 1 5 1 5 2 5 3 5 4 5 5 5 6 5 7 6 1 A 1 D 1 H 1 Aerosol Electrometer Packing List ooooncnccnnccccnnconconcanocno 2 1 Menu Structure and Navigation Path ees 3 2 Descriptions of Scheduling Parameters for an Aerosol BHl Ctrometer inma do ranas 5 15 Descriptions of Settings Parameters for an Aerosol ELE CtrOMELEL ruta As 5 17 Descriptions for the Communications Tab ce 5 19 Samples List View Popup MeNU occcoccnoccniconioconacnniconancnincnns 5 39 View Popup MENU vis sieiieciecce o cedyivetvedsecvocis ees euvnviee ER 5 41 Graph View Pop
53. he Properties dialog box Aerosol Instrument Manager Software 5 19 A Cannot communicate with the instrument Please check that it is connected tumed on and that the port is not already in use by another application 5 20 Figure 5 11 Communications Error Message Use the Communications Tab to verify the connection to the sensor and make certain the sensor is turned on Once the program connects with the instrument the Samples List window Data Graph Data Table and Statistics windows open on the desktop in an auto fit 4 pane layout 6 Select Run Start Data Collection or on the toolbar Sampling will proceed as set up in the Properties dialog box When the program begins collecting sample data the data is displayed in the windows that are open on the desktop As each sample finishes the data for the sample is stored and a new sample begins When the last sample finishes sampling stops but the windows remain open 7 View print and export the sample data using procedures described in the Getting Started section earlier in this chapter Software Menus This section describes the software functions available for the Aerosol Electrometer software There are two types of menus you can use desktop menus and context sensitive or popup menus a Desktop menus are those menus listed at the top of the Nanoparticle Surface Area Monitor desktop They include File Run Format View Window and Help a Popup
54. ii Purpose ienne o LAA det dene ees Soong NT es xvii How This Manual is Organized ccooccnoccnncnnoccnnncnnannnccnncanacanoso xvii Notations Conventions Used in This Manual 0 xviii Related Product Literature occocccoconccnconconcnncnnnconcanconcnnanancnno xviii Getting Helpis a a E EG xix SUBMITHN EG COMMENTS serpes irn eres veces neesii KERES ano xix CHAPTER 1 Product Overview cscccecsccccccccsccceccecececes 1 1 Product DESCripUlOn ibi 1 1 SoftWare sez O a idas 1 2 Electrometer Current and Calculated Particle Concentration O te oi 1 3 CHAPTER 2 Unpacking and Setting Up the System 2 1 Packing Lista Ns 2 1 Unpacking Instruction Suiss nseni keneen niise iI 2 1 Moving the Instrument aieri retena n E A A EAR 2 2 Mounting the Instrument ocooconccnccnncnncnncnncnncnncnnnconcnncancnnananos 2 2 Power CONNECTION idad iaa cele deena Bek cies 2 2 Connecting to Vacit oases ere i a ar AE 2 3 Connecting to the Aerosol Source occoocccoccnoconoconiconacinaccninnnns 2 3 Connecting to the Computter ssssssssessessrssresrereesessessreserseese 2 4 Analog Output sce gece chs stesetn aver eieae eniT eE rE ENA EESE S 2 4 Optional Accessories rninn aaa E E E N STe 2 5 CHAPTER 3 Controls Indicators and Connectors 3 1 Front Paneles oti ates ton peeved ota E ete ebn ae aed een tees 3 1 Keypad Display and Menu Navigation cooccncconocnnoconiconanos 3 2 Indicator Lights vtr decnu
55. ion will be described in Chapter 4 Briefly Q The menus go from a lower to a higher menu level using the left or right key and from a higher to a lower menu level using the ESC key Q Menus are rolled through using the up and down arrow keys Q The user settings are selected using the left and right arrow keys The new setting becomes active immediately If you press ESC before hitting the enter key the settings are not changed Table 3 1 Menu Structure and Navigation Path Menu Level Description Up Down Left Right Enter Escape 0 cil di POwET Primary Primary Primary Primary Primary Primary 1 Primary display User Settings Secondar mode 9 y Secondary display 1 Mode Primary Status Primary 1 Status Secondary Primary Aerosol T Primary 2 Aerosol Temp Firmware Aerosol P Status 2 Aerosol Pressure Aerosol T Ambient P Status 3 2 Model 3068B Aerosol Electrometer Menu Level Description Up Down Left Right Enter Escape 2 Ambient Press Aerosol P Cabinet T Status 2 Cabinet Temp Ambient P Valve Duty Cycle Status 2 Valve Duty Cycle Cabinet T USB Status Status 2 USB Status Valve Duty Cycle Zero Offset Status Firmware 2 Zero Offset USB Status VE Status 2 Firmware Version Zero Offset Aerosol T Status Flow 1 User Settings Status Primary Control Primary 2 Flow Control Seat Flow Setting Toggle On Off Manual Settings
56. iu BYH and DYH Pui 1975 On the Performance of the Electrical Aerosol Analyzer J Aerosol Sci 6 249 264 Theory of Operation B 3 10 11 Liu BYH and DYH Pui 1974 A Submicron Aerosol Standard and the Primary Absolute Calibration of the Condensation Nuclei Counter J Colloid Interface Sci 47 155 171 Liu BYH and DYH Pui 1977 On Unipolar Diffusion Charging of Aerosols in the Continuum Regime J Colloid Interface Sci 58 142 Liu BYH and KW Lee 1975 An Aerosol Generator of High Stability Am Ind Hyg Assoc J 36 861 865 Liu BYH and KW Lee 1976 Efficiency of Membrane and Nuclepore Filters for Submicrometer Aerosols Environ Sci Technol 10 345 350 Liu BYH and GA Kuhlmey 1977 Efficiency of Air Sampling Filter Media in X Ray Fluorescence Analysis of Environmental Samples P 107 119 T G Dzubay ed Ann Arbor Science Publishers Inc Ann Arbor Mich Pui DYH 1976 Experimental Study of Diffusion Charging of Aerosols Ph D Thesis Mechanical Engineering Department University of Minnesota Minneapolis Minnesota Sem GJ 1975 Design and Application of An Electrical Size Analyzer for Submicron Aerosol Particles Analysis Instrumentation Vol 13 Proceedings of the 21st Annual ISA Analysis Instrumentation Symposium Instrument Society of America 400 Stanwix St Pittsburgh Pa 15222 Sinclair D RJ Countess BYH Liu an
57. laced without having to remove the instrument cover See Chapter 6 Maintenance for more information Model 3068B Aerosol Electrometer CHAPTER 4 Operating the Aerosol Electrometer This chapter describes how to operate the Model 3068B Aerosol Electrometer either through front panel controls or computer control Front Panel Controls To control what is displayed on the front panel to check instrument status and to control some of the functions of the Aerosol Electrometer can all be done from the front panel using the front panel controls The sections below describe how to perform some of these functions To Start Measurement 1 Supply power to the Aerosol Electrometer by plugging the AC power cord into the power cord inlet on the back panel and then into an AC source Switch on the power switch next to the power cord inlet It will typically take 10 minutes to warm up when the power is switched on with the display showing the warming up message Pressing any button on the front panel will eliminate the warm up message but full stability requires approximately 10 minutes The instrument will configure itself according to the state it was in when last powered off 2 Connect a vacuum source TSI Model 3033 Vacuum Pump or equivalent to the External Vacuum connector 3 Choose one of the three options below a Ifthe instrument has been previously configured and there is no need to change the configuration connect the ae
58. lectrometer 4 3 7 Press the down Y arrow to view the USB status 8 Press the down Y arrow to view the current zero offset 9 Press the down Y arrow to view the firmware version 10 Press the up _4 or down _Y arrow to scroll through the status data if necessary 11 Press ESC ESC at any of the previous steps to return to the Status menu 12 Press ESC ESC again to return the primary current and flow display window Computer Control The 3068B Aerosol Electrometer can be controlled by a computer either with the Aerosol Instrument Manager software developed by TSI or by other software Using Aerosol Instrument Manager Software The software designed to be used with the Model 3068B Aerosol Electrometer is called Aerosol Instrument Manager software Aerosol Instrument Manager software supports many other TSI instruments to provide a uniform user interface The Aerosol Instrument Manager software that supports the Electrometer is shipped as an accessory to the instrument Connect the instrument to a computer using either the enclosed USB or serial cable Follow the instructions in Chapter 5 Aerosol Instrument Manager Software of this manual to install and run the software Using Other Software Software that allows a computer to communicate using the serial port may also be used to control and collect data from the Electrometer For example you may wish to develop specialized software using Microsoft
59. lectrometer Sensor Noisy Electrometer Output 7 2 The Electrometer current sensor in the Aerosol Electrometer has an electrical noise level less than 1 fA RMS at 1 second running average Such low noise levels require very careful handling to provide sufficient shielding and insulation To check the Electrometer noise level put a HEPA filter at the inlet of the electrometer Set the flow rate at 2 L min and wait a few minutes for the particles inside the electrometer to be purged Then turn off flow by disconnecting electrometer from the external vacuum Next take current measurement for 2 minutes and record the N current data I Use Aerosol Instrument Manager software to show the RMS value in statistics or calculate the RMS value of the noise level Ius as follows Irus 1 7 fn i l where T is the average value of the N current data I If the Electrometer exhibits excessive random noise at zero flow more than 5 fA RMS try the following steps 1 Reset the zero offset of the electrometer and measure the RMS noise again Model 3068B Aerosol Electrometer Unstable Zero 2 Ifthe noise persists check the vibration level of the surface on which the electrometer sits If the vibration is high move the electrometer to a stable surface and measure the RMS noise without flow again 3 Ifthe noise level is still high the problem is probably a poor electrical connection or an electrical leakage path to ground due t
60. les the RS 232 communications Analog Out The Analog Output is a BNC connector that can be configured to provide a 0 10 V output corresponding to one of the following aerosol current ranges note that 1 pA equals 1000 fA e 12 5 to 12 5 pA e 1 0 to 1 0 pA e Oto 12 5 pA e Oto 10 0 pA e Oto 1 0pA e Oto 0 1 pA e Oto 0 1 pA e Oto l 0 pA e Oto 10 0 pA e Oto 12 5 pA e OFF Note The analog port is provided for backward compatibility with older electrometers The resolution is limited to 16 bit It is much more accurate to use the digital USB or Serial ports For more information see Appendix D Serial Commands Aerosol Inlet The aerosol inlet samples 0 3 to 10 L min of aerosol from ambient air It can also be connected to tubing for sampling If sampling tubing is used it should be conductive or static dissipative to reduce particle losses External Vacuum Tubing The external vacuum tubing on the back of the Electrometer is a 1 4 inch stainless steel tube This tube should be connected to an external vacuum source such as a pump or a vacuum line using tubing that will not collapse under vacuum such as the tubing P N 3929408 and union compression fitting P N 1601052 provided in the accessory kit Control Indicators and Connectors 3 5 Filter Access Cover The metal plate that contains the sample inlet serves as the Filter Access Cover The access cover allows the electrometer filter to be rep
61. lues of a data point as follows 1 Position the pointer on the line or data point so that the pointer becomes a pointing hand This indicates that your mouse is over a data point on the graph 2 Press the left mouse button to display the values Figure 5 4 shows how the data values would be displayed for an aerosol electrometer sensor Data Graph Room Air E68 oj x room air 12 25 20 PM 10 0 8 0 6 0 40 2 71 Caida AM A AO eT Electrometer Current fA o o i 1 1220 1221 1222 1223 1224 1225 122 1227 1228 1229 1230 20 Fri Jan 2006 Time f Sample Length mm ss 10 00 Sample 1 Disconnected E Figure 5 4 Use the Mouse to Directly View Data Values AE sample file Tip After you have a data hot spot selected use the arrow keys or the gt and lt keys to move the cursor right or left from one value to the next or grab the vertical bar and drag it to another location Refer to Appendix F for a list of other keys or key combinations you can use to navigate and perform operations without using the mouse 5 8 Model 3068B Aerosol Electrometer Delete Undelete Samples To delete samples from a file you must first mark them for deletion and then Save the file The following procedures will permanently delete samples from a file Mark samples for deletion as follows 1 Select the sample you want to delete from the Samples List window you can select multiple samples 2 Sele
62. matically To export data automatically to a file for use in another program such as Microsoft Excel 1 Establish a connection to the Aerosol Electrometer sensor by choosing File New or File Open Select Run Connect to Instrument if not already connected Select Run Auto Export before you begin to collect data Select Run Start Data Collection The data is exported to the file as it is collected Arrange Open Windows When you have several windows open on the desktop it is helpful to arrange them for easier viewing To arrange windows select an item from the Window menu You can arrange windows on your desktop horizontally vertically have them cascade or arrange them in a predetermined auto fit two or four pane layout Refer to your Windows documentation for examples and more information for Tile horizontal Tile vertical and cascade layouts You can also use z5 in the toolbar for the two pane or four pane layout as shown in Figure 5 7 two pane layout shown for an aerosol electrometer file Microsoft and Excel are registered trademarks of Microsoft Corporation 5 12 Model 3068B Aerosol Electrometer Aerosol Instrument Manager AIM1_E68 D ce i S Ce S Cd D gt 9 ioo all La BE 08 7 Tue Mar 2006 List AlM1 E68 a olx Bectrometer Samples Name e Viewing Sample 1 03 07 06 12 42 00 CAdev aim v7testing AlM1 E68 2 Sample 2 03 07 06 13 47 00 C dev
63. nager Software 5 3 Menu Options Data Display Table Format Aerosol Instrument Manager 8hr_sample E68 le x T eS A E MAA ICAA EA Data Graph sample E68 _ N Data Table 8hr_sample E68 Tool Bar overnight 15 0 Data Display Graph Format E li Viewing Sample 1 03 07 06 21 35 00 Samples List a C dev aim v7 testing 8hr_sample E68 4 64e 03 Statistics Table Figure 5 1 The Aerosol Instrument Manager Desktop Open an Existing File 1 Select Filel Open or on the toolbar The Open Instrument Associated Data Files window opens 2 When the Open Instrument Associated Data Files window appears select a file with the extension E68 for the Aerosol Electrometer 3 If necessary browse for the drive directory where data files are stored Example files are included with the program and were installed in the Aerosol Instrument Manager folder when the program was installed 5 4 Model 3068B Aerosol Electrometer 4 Select the data file that you want to open and click Open At least two windows open on the desktop a window containing a graph of the sample data and the Samples List window Note If the file has been opened before it may display more than one graph and or table The program remembers the windows that were open on the desktop when you last closed the file and reope
64. nation Reinstall the electrometer cover Turn the instrument back on 10 After replacing the filter it will often take several hours for the current reading to stabilize For best results allow the Maintenance 6 3 instrument to sit overnight and then reset the zero offset in the morning Checking the Flowmeter To check the flowmeter use a trusted standard volumetric flowmeter attached to the inlet of the instrument Notes Vapor from wet cell flowmeters can cause error in the aerosol electrometer s internal flowmeter Therefore if a wet cell bubble flowmeter is used desiccant should be placed in line between the wet cell flowmeter and the inlet Automatic flow control is provided for flexibility However the instrument uses a volumetric flowmeter Due to the pressure drop through the electrometer filter the accuracy of the flow control is limited to 2 up to 2 L min and 5 up to 10 L min More accurate flow control and therefore a more accurate measurement is possible by setting the flow control to manual mode and using an external needle valve or critical orifice to control the flow Testing for Leaks Whenever an air leak is suspected or a significant part of the airflow system has been reassembled perform a leak test to assure proper performance 1 2 3 Disconnect the electric power cable Use the inlet shipping plug to block the Sample Inlet port Connect a vacuum pump with valve and ga
65. ndow size and position Scheduling options Sample settings such as sample flow rate and average particle charge Export options Data Files Project Files and Stored Parameters E 3 APPENDIX F Accelerator Keys Accelerator keys are those keys and key combinations that allow you to perform operations using only your keyboard no mouse required These are the accelerator keys that can be used with your sensor Ctrl A Select all in the Samples List window when the window is active F 1 APPENDIX G Sequence Files The files for sample sessions that run past midnight or run for more than 24 hours are handled differently than those that start and stop on the same date Midnight occurs on your system according to the setting of your computer s system clock For these sample sessions a sequence of files is created with each file in the sequence given a unique filename extension identifying its proper order Normally only a single file is created for any sample session and it has a filename extension of the form E68 For example Atomosphere E68 would be identified as a 3068B Aerosol Electrometer file If the sample session period runs past midnight a file is created for each date day The samples collected before midnight including the sample that is running at midnight are collected in a file with the normal extension i e E68 Samples that are collected after midnight are saved in a file with an extensi
66. ng down the left mouse button and moving the mouse to rubber band outline the samples you want to select Note The Playback menu items and toolbar icons are only enabled when the Samples view is the active view 2 When you have selected the samples you want to view select Playback Play The setup box shown in Figure 5 3 appears Playback Setup X Sample Viewing Time C full speed Play Once Play Continuous 1 second C 0 5 seconds C 2 5seconds Cancel C 5 seconds Figure 5 3 Playback Setup Dialog Box 3 Select the sample viewing time and whether you want the samples displayed once or continuously Playback begins immediately For better viewing it may be necessary to minimize the Samples List window 4 You can pause the playback at any time by selecting Playback Pause Select Playback Play to continue playback where you left off You can stop playback at any time by selecting Playback Stop When you stop playback you cannot restart it Use Playback Pause and Playback Play if you want to stop and start playback You can also control playback by using icons on the toolbar The icons perform the following operations Ml Stop Stop playback ause Pause playback on current sample Hl pause Pause playback pl Start Start playback or restart playback Aerosol Instrument Manager Software 5 7 Select a Data Hot Spot When a graph is open on the desktop you can find the va
67. ng interval need to change the value of either the sample length or the averaging interval The Sample Length should be divisible by the Averaging Interval cannot exceed 28 800 Properties Scheduling values are invalid Unable to save changed property values for the sample Contact TSI for support Try to restart Aerosol Instrument Manager If this message reappears reinstall Aerosol Instrument Manager Contact TSI for support The properties for sample x could not be saved Unable to create the graph control Unable to start Timer for CPC data collection Model 3068B Aerosol Electrometer Index 8 8 hr TWA 5 41 A abort current sample 5 25 about Aerosol Instrument Manager 5 38 about this manual xvii AC power connector 3 4 AC POWER IN connection 2 2 accelerator keys F 1 accessories optional 2 5 active window xviii aerosol inlet 3 5 Aerosol Instrument Manager Software 5 1 see also software arrange open windows 5 12 change how data is viewed 5 5 delete undelete samples 5 9 desktop 5 3 5 4 desktop menus 5 21 export data 5 11 getting started 5 3 installation 5 2 installation requirements 5 1 instrument properties 5 14 menus 5 20 opening an existing file 5 4 playback data samples 5 6 print information displayed on desktop 5 10 procedures 5 14 quite program 5 13 sample data 5 19 select data hot spot 5 8 starting program 5 3 using 4 4 zoom in zoom out 5 9 aerosol p
68. nge the data You may also select items from the Format Menu Refer to Format Menu in this chapter for a list of formatting options with detailed explanations View Another Sample in the Same File 1 To view another sample in an open file select the icon go forward one sample from the toolbar or simply use the mouse button to highlight a sample in the samples view The data for that sample will display in each of the open windows 2 You can continue to step through the samples by pressing the icon until you reach the last sample The sample currently displayed in the open window is highlighted in the Samples List window You can use the following icons to display other samples m First Sample Advance to the first sample KI Previous Sample Advance to the previous sample Next Sample Advance to the next sample a Last Sample Advance to the last sample Playback Review Data Samples You can display sample graphs and tables in a slide show fashion to preview sample results or compare sample differences as follows 1 From the Samples List window select the samples you want to play back using one of the following actions Select Sample Select All to play back all samples or Select individual samples using the mouse and the Ctrl key to highlight those samples you want to see You must select at least two samples or 5 6 Model 3068B Aerosol Electrometer Select a group of samples by holdi
69. normal view Aerosol Instrument Manager Software 5 9 5 10 Print Information Displayed on the Desktop You can print the information displayed in the active window on the desktop as follows you must have a printer properly installed 1 With a graph or table window active on the desktop select File Print Preview or aJ from the toolbar 2 Review that what you see in the print preview window is what you want to print an example is shown in Figure 5 5 and then select Print from the Preview box The contents of the window are sent to your printer You can immediately print a window without previewing it by selecting File Print or G from the toolbar Data Graph Room Air E68 Wert Rage Prey Page Tia Rage Zoom In Zoom ut Close TSI Electrometer 3068B Room Air ES8 Sample Number 1 01 20 2006 12 20 00 Averaging Interval hh mm ss 00 00 01 Average Particle Charge C 1 000 Electrometer Current room air 12 25 20 PM g E Figure 5 5 Print Preview Model 3068B Aerosol Electrometer Export Data to a File You can export data from an Aerosol Instrument Manager file either a single sample of the file or multiple samples of the file for use in another program either manually or automatically To Export Data to a File Manually To manually export data to be used in another program 1 Select the sample or samples to be exported as follows To export data from a single sample displ
70. ns them when you access the file again If the file contains a sequence of samples all the files in the sequence will be accessed See Appendix G Sequence Files for information about sequence files The Samples List window opens whenever you open a data file and remains open on the desktop as long as the data file is open Closing the Samples List window closes the data file and all its open windows Change How Data is Viewed You can view aerosol electrometer data in tables or graphs The following procedure provides an example of how you can change how data is viewed 1 Open one of the sample files for an aerosol electrometer 2 With the graph window active on the desktop press the right mouse button to open the popup menu You may choose to display the data in the graph as either electrometer current or calculated concentration Display As a v Electrometer Current fA Calculated Concentration cr HAS View Boundaries AGort current sample Graph Type gt Grid Lines gt Color Font gt Undo Zoom zZ Copy Ctrl C Print Print Preview Figure 5 2 Graph View Popup Menu Aerosol Instrument Manager Software 5 5 Note Some of the items on this menu are discussed later in the next chapter under the section titled Context Sensitive Menus 3 Experiment with other views by selecting options from their popup menu to see how your selections cha
71. nstrument model 3068B Displays the instrument serial number Version Displays the instrument firmware version Status Displays Connected if we have a connection active on this port How To Collect Sample Data The Aerosol Electrometer allows you to collect data directly from the sensor as it is sampled Collecting Sample Data To collect data from an Aerosol Electrometer proceed as follows 1 Make certain the instrument is connected properly to the computer Refer to the instrument manual if necessary 2 Select File New or ja on the toolbar The New Instrument and Associated Data File dialog box opens on your desktop 3 Select a filename and optionally a location other than the Aerosol Instrument Manager folder The default name is AIM1 for the first file you open AIM2 for the second file you open and so on You can accept the default name or enter any name you choose 4 Verify that the Files of Type box indicates the correct extension for the sensor you are using the extension indicates the correct instrument model number for example E68 for a Model 3068B Aerosol Electrometer You do not need to enter an extension in the filename box It will be automatically assigned the extension that you selected 5 After you enter a filename or if you accept the default name press the Open button If you get the following error message when opening a New file press the OK button to open t
72. nt Status initial READY Errors Detected None Comment Sample Length 01 00 00 Sample 1 Disconnected B Figure 5 22 View Settings 5 34 Model 3068B Aerosol Electrometer Hectrometer 3068B Instrument Status X Version SN 705521 38 FIRM 1 0 59 FPGA Ver 1 1 Current Readings Electrometer Current fA 016 Sample Flow Rate Ipm 0000 Flow e 20 Concentration ene 000 Tete IC Aerosol Temp C 2888 da Aerosol Pressure kPa se2a Zero ETS Cabinet Temp C 30 3 Valve Duty Cycle 2 0 0 Status Instrument Errors Copy Select View Copy or from the toolbar to copy the active window to the clipboard so that you can paste it in other applications for example a word processing program You can only copy tables and graphs Instrument Status Ctrl I Select View Instrument Status Ctrl I to display a dialog window displaying status information for the Aerosol Electrometer The information in this dialog is updated every second until the dialog is closed Offset fA Analog Output Mode Mode 0 12 5 to 12 5 p y Figure 5 23 Instrument Status Dialog From this dialog you may also control the flows set the flow set point average particle charge analog output mode and zero the electrometer Aerosol Instrument Manager Software 5 35 5 36 Button Description Flo
73. nual easy to understand and use U Yes A No Please identify any problem area s 2 Was there any incorrect or missing information please explain 3 Please rate the manual according to the following features Good Adequate Poor Readability Accuracy Completeness is everything there Organization finding what you need Quality and number of illustrations Quality and number of examples DOODO0CDO OOOOoO OOOoOoOo Comments 4 Which part s of this manual did you find most helpful 5 Rate your level of experience with the product Beginning Q Intermediate Expert 6 Please provide us with the following information Name Address Title Company TSI Incorporated 500 Cardigan Road Shoreview MN 55126 U S A For current information Telephone 1 800 874 2811 toll free or 651 490 2811 Fax 651 490 3824 E mail particle O tsi com www tsi com P N 1930077 Rev A Copyright 2006 by TSI Incorporated All rights reserved
74. o contamination Wear lint free gloves and remove the filter cover plate Refer to the section Replacing the Filter Cartridge and Cleaning the Electrometer in Chapter 6 Clean the upper insulator and inlet tube assembly using detergent and water in an ultrasonic cleaner Rinse with clean water then rinse with clean reagent grade alcohol Air dry and reinstall the upper insulator using a moderate amount of high vacuum grease on the O ring Do not touch upper insulator with bare fingers after cleaning and do not apply vacuum grease anywhere except to the O ring It may take more than 24 hours after cleaning for the stress built up in the insulator to release and the noise to settle down Generally noise that is present only when the flow is on is not an electrometer problem but rather a problem with fluctuations in the aerosol concentration level To check this connect a high efficiency particle filter to the aerosol sample inlet so that the measured aerosol concentration goes to nearly zero The noise fluctuations will then normally disappear For situations not covered above or if the noise level is still high contact customer service for assistance see Chapter 8 Offset Level The 3068B Electrometer design has proven to be very stable Development tests have typically shown that the drift of offset is within 2 fA over 24 hours at conditions of 50 RH and 5 C or 35 C The drift of offset is within 2 fA over 1 hour at 90
75. oise level of this electrometer is better than 1 femptoAmp fA root mean square RMS with a one second averaging time The Model 3068B Electrometer has a built in thermal flowmeter and proportional solenoid valve controlled by a microprocessor This configuration allows the user specified aerosol sample rate to be controlled in the range of 0 3 10 liters per minute L min Data are presented on the front panel display as an analog voltage output or through the RS 232 serial or USB interfaces The electrometer is supported by the Aerosol Instrument Manager software to allow data to be collected stored and manipulated The Aerosol Instrument Manager software is used to collect sample data from a sensor and store the sample data in files You can use the software to display data in graphs and tables or view statistical information You can print graphs and tables with the software and export data for use in other applications There are a number of ways to navigate within the program These include selecting items from the main menus selecting icons from the toolbar and selecting items from submenus which you access by right clicking the mouse button Specific instructions are provided in the following chapters This manual covers the use of the Aerosol Instrument Manager software with TSI model 3068B Aerosol Electrometer sensors only For information about software operation with other TSI sensors refer to the appropriate manu
76. on of the form 1 E68 Using the same example as above the next filename would be Atmosphere 1 E68 For a very long sample session a file is created each time the sample session runs past midnight and is indicated by adding a new number to the file extension Using the previous example the file following Atmosphere 1 E68 is Atmosphere 2 E68 and the next file would be Atmosphere 3 E68 and so on These files contain information to link them when opened and the files can be recalled as if they were a single file The files may also be selected and opened as individual files When you save the samples collected during a sample session that runs past midnight you provide a filename just as you would for any sample session You do not provide any extensions The software automatically adds a file extension Opening a File That is Part of a Sequence G 2 If you select File Open and the file is part of a sequence of files i e the sample session ran over midnight all files in the sequence will be automatically opened Note If you select View Samples List Details you can see the pathname for each sample When you open a sequence of files the software looks for the first file of that sequence i e the one with the E68 extension for a Model 3068 Aerosol Electrometer and opens all files in sequence beginning with that file If a sequence file is unavailable for example it has been deleted mo
77. onto your computer A Getting Started chapter that introduces basic software operation How to information for using the program to operate and collect data with an aerosol electrometer Descriptions of the menus and menu items that are valid when collecting data with an aerosol electrometer Appendixes that provide reference information associated with instrument and program operation xvii Notations Conventions Used in This Manual Throughout this manual when reference is made to Windows it implies Windows 2000 or Windows XP operating system Bold face type is used to indicate that you should perform the indicated action For example select the File menu means that you should use the mouse and click on the menu called File When instructions direct you to select items from a menu a vertical bar is used to separate the items you should select For example select File Properties Settings means you should click on the File menu then select the Properties item and then select the Settings tab The term active window is used to refer to the window that is open on the desktop and is in focus To verify which window is active select the Window menu and note which item has a checkmark by it You can make a window active by moving the pointer to that window and clicking the mouse button Related Product Literature Q Model 3080 Electrostatic Classifier Manual p
78. oo 2 A at an average of 1 s over 24 hours at environmental conditions of 5 C and 50 RH and 35 C and 50 RH 2 fA at an average of 1 s over 1 hour at environmental conditions of 35 C and 90 RH Linearity error seseeees lt 1 of reading Data dynamic range 12 5 pA Maximum data rate 1 Hz Warm up time cscseeee Settle to 2 fA within 10 minutes Step response time 2 5 s 0 90 of final value at 1 s average Flow rate cccececeeevevseevees Programmable from 0 3 to 2 L min 2 and 2 0 to 10 L min 5 at 101 3kPa and 20 C Aerosol temperature range 5 to 35 C Aerosol pressure range From 25 below to 25 above atmosphere pressure Particle size range 2 to 5000 nm Front panel display 2 line and 16 Character Alphanumeric display Dimensions LWH 30 4 cm x 21 3 cm x 19 6 cm 12 in x 8 4 in x 7 7 in Weight oococcccccnonccnnnoncnnnnns 4 5 kg 9 9 Ib continued on next page A 1 Table A 1 Specifications of the 3068B Aerosol Electrometer continued Outputs Configurable analog BNC 0 10V PISA Ort Dell DSUB 9 pin RS 232 and USB B series Ports Sample Inlet Y4 in OD tube External Vacuum 0666 4 in OD tube Power requirements 100 to 240 VAC 50 60 Hz 60W maximum Environmental conditions
79. ou can select a drive directory You can use the same filename if you save the file to another drive directory but if you want to save the file to the same directory you must give it a new name Do not add the filename extension It is added automatically when you select Save Import This menu option is used to import data collected by CPC 377X Series WCPC 3781 and older version SMPS and APS data files It is not normally used with the Electrometer but is included as part of the software module This option is described in the Aerosol Instrument Manager Software user manuals for those instruments Export Select File Export to export data either a single sample or multiple samples of a file for use in another program Data is exported in a delimited excel csv or text file Refer to Export Data to a File earlier in this chapter for information Properties Select File Properties to open the properties dialog to view and to set parameters for the currently selected sample All properties are stored in the file with each sample collected by the Aerosol Electrometer The parameters that can be set for each sensor on each tab are described in How to Collect Sample Data earlier in this chapter Print Select File Print or S to print the active window on the desktop in a report format If you want to preview the output before printing it select File Print Preview or al Refer to your Windows document
80. per particle E 1 Project files are created by the program when you open a data file and work with it The project file name is the same as the data file name with the extension p68 instead of E68 Project files keep track of cosmetic attributes like which windows are open on the desktop when you close the file and how that information is displayed This information is recalled the next time you open the data file If you transfer data files to someone you do not need to transfer the project files unless you want to If you delete a project file a new project file is created when you reopen the data file Project File Parameters E 2 The following parameters are saved for each window a The graph type bar line or area a The grid type shown on the graph none vertical horizontal or both vertical and horizontal a Y axis scale parameters a List type for the Samples List window Q Position and size of each window The following parameters apply to the entire file not to each individual window Q Playback delay time Q Current sample index the sample number of the sample you were viewing when you exited the program Model 3068B Aerosol Electrometer Saved Parameters The following parameters are stored in the Aerosol Instrument Q D oO oO O0 Manager application initialization file aim ini Font and color for tables Font and color for graphs Aerosol Instrument Manager main wi
81. ports Remove the two 2 screws securing the filter access cover shown in Figure 6 1 Wear clean lint free gloves to reduce chances of contamination of interior parts Pull the cover plate straight out Be careful not to touch the plastic insulator attached to the inner side of the cover Figure 6 2 this will 6 2 Model 3068B Aerosol Electrometer Insulator reduce its insulating properties and increase the noise in the electrometer Place it in a clean bag or on a clean surface Locate and remove the electrometer filter Figure 6 2 by pulling it straight out Notice that a spring wire should connect the outer metal housing to the filter housing This is to prevent electrostatic damage to the electrometer during filter replacement If the wire is not connecting the two metal surfaces adjust the wire position Mode 7 TA Date DECEMBER ZOO For Service and Information e mo Contact TS Customer Service meee Penne www tsicom 500 Cardigan Road Shoreview MN 55126 USA _ Y y Spring Wire Filter Figure 6 2 Electrometer Filter Insulator and Spring Wire 6 8 9 Replace the filter with a wire core filter provided in the accessory kit TSI P N 1602346 Inspect the O rings in the cover for nicks or cuts and replace if necessary If the insulator is dirty or has been touched by bare fingers it should be cleaned and wiped with methanol or isopropanol and then acetone to remove all contami
82. r generating monodisperse aerosol of known size and charge With a user defined average charge the electrometer results can be displayed as number concentrations Unpacking and Setting up the System 2 5 Front Panel CHAPTER 3 Controls Indicators and Connectors Use the information in this chapter to familiarize yourself with the location and function of controls indicators and connectors on the Model 3068B Aerosol Electrometer This chapter is organized into two sections describing the front and back panels of the instrument The main components of the front panel are a keypad with six 6 keys a display and two LED indicators see Figure 3 1 Figure 3 1 Front of the Model 3068B Aerosol Electrometer Keypad Display and Menu Navigation As shown in Figure 3 2 the keypad has six keys scroll left 41 scroll right scroll up 4 scroll down Y Enter gt and ESC ESC You can set up operating parameters via the keypad as well as serially through the computer The display is a 2 line by 16 character alphanumeric display Figure 3 2 It shows information on measurement results menu options or error messages zy lt Jl4 gt Lv Figure 3 2 Keypad and Display The menu structure of the Electrometer Model 3068B is divided into three different levels The user can navigate the menu options using the keypad The menu structure and navigation path are shown in Table 3 1 Detailed navigation instruct
83. r Service at 1 800 874 2811 USA or 651 490 2811 Aerosol Electrometer for Visit our website at http rma tsi com or call TSI at 1 800 874 2811 USA or 651 490 2811 for specific return instructions Customer Service will need this information when you call Q D o oO DO The instrument model number The instrument serial number A purchase order number unless under warranty A billing address A shipping address 8 1 8 2 Use the original packing material to return the instrument to TSI If you no longer have the original packing material seal off any ports to prevent debris from entering the instrument and ensure that the display and the connectors on the instrument front and back panels are protected Model 3068B Aerosol Electrometer APPENDIX A Model 3068B Specifications The following specifications list the most important features of the Model 3068B Aerosol Electrometer Table A 1 Specifications of the 3068B Aerosol Electrometer Mode of operation Measure particle concentration by measuring the current induced by charged particles collected on a filter Measurement range 12 5 pA Particle type 08 Solids and nonvolatile liquids Current accuracy 0sc008 2 of reading or 5 fA whichever is greater NDA lt 1 fA RMS at 1 s average Drift Stability o o
84. r deletion 5 9 maximum data rate A 1 menu navigation 3 2 menu structure 3 2 menus software 5 20 mode of operation A 1 Model 3033 Vacuum Pump 4 1 Model 3076 Constant Output Atomizer C 1 Model 3080 Electrostatic Classifier 1 1 manual xviii Model 3480 Electrospray Aerosol Generator C 1 Model 3772 3771 Condensation Particle Counter manual xviii Model 3775 Condensation Particle Counter manual xviii Model 3776 Ultrafine Particle Counter manual xviii monodisperse C 1 mounting instrument 2 2 moving instrument 2 2 N navigation 1 2 navigation path 3 2 navigation toolbar 5 36 next sample 5 37 noise A 1 noisy output 7 2 notations conventions xviii number of samples 5 15 O offset 5 18 on off switch 3 4 open an existing file 5 4 operation 4 1 optional accessories 2 5 organization manual xvii outputs A 2 P packing instructions 8 2 packing list 2 1 particle size range A 1 particle type A 1 pause 5 7 5 26 performance 6 1 pin connectors D 1 play 5 26 play continuous 5 26 play once 5 26 playback data samples 5 6 playback icons 5 7 playback menu 5 26 pause 5 26 play 5 26 screen 5 26 stop 5 26 playback setup dialog box 5 7 polydisperse aerosol C 1 popup menus 5 39 port settings D 3 ports A 2 Index 3 power cable 4 1 connection 2 2 cord inlet 4 1 requirements A 2 power light 3 3 preview print 5 10 previous sample 5 37 principle of aerosol elect
85. ressure 4 3 aerosol pressure range A 1 aerosol source connecting 2 3 aerosol temperature 4 3 aerosol temperature range A 1 ambient pressure 4 3 analog output 2 4 3 5 analog output mode 5 36 analog output scale setting menu 4 2 application notes C 1 arrange open windows 5 12 ASCII setup D 4 auto export 5 25 AutoPlay 5 2 average charge particle setting menu 4 2 average particle charge 5 18 averaging interval 5 16 avg particle charge 5 36 B back panel 3 4 beginning sample 5 37 C cabinet temperature 4 3 cable power 4 1 calculated concentration 5 11 calculated particle concentration 1 3 calibration 6 1 caution xiii description xv symbol xv xvi chamber cover screws 6 2 change how data is viewed 5 5 characterizing concentration linearity C 4 characterizing lower counting limit C 1 checking flowmeter 6 4 classifier C 1 cleaning 6 2 collecting sample data 5 19 color 5 29 5 41 5 43 color and font toolbar 5 36 commands serial D 1 communications error dialog box 5 20 communications tab 5 18 descriptions 5 19 properties dialog box 5 18 computer connecting 2 4 computer control 4 4 concentration linearity result of 3772 C 4 configurable analog output A 2 configure user settings 4 2 connect to a serial port dialog box D 3 connect to instrument 5 25 connecting aerosol source 2 3 computer 2 4 connecting continued vacuum 2 3 connection description D
86. rometer B 1 print 5 41 5 43 print information displayed 5 10 print preview 5 23 5 41 5 43 screen 5 10 print setup 5 24 product description 1 1 product overview 1 1 software 1 2 project files E 1 properties 5 25 5 39 protective caps 2 1 purpose of manual xvii Q quit the program 5 13 R reader s comments Reader s Comments Sheet README TXT file 5 2 references B 3 replacing filter cartridge 6 2 returning for service 8 1 root mean square 1 2 RS 232 3 4 serial interface port 5 2 run menu 5 24 abort current sample 5 25 auto export 5 25 connect to instrument 5 25 disconnect from instrument 5 25 finish current sample 5 25 instrument status 5 35 properties 5 25 screen 5 24 start data collection 5 24 stop current sample 5 25 S safety xiii caution symbol xv labels xiii sample data collecting 5 19 sample flow 5 11 5 17 sample inlet A 2 connector 4 1 sample length 5 15 Index 4 sample menu 5 36 beginning sample 5 37 delete undelete sample 5 37 dialog box 5 37 ending sample 5 37 next sample 5 37 previous sample 5 37 select all 5 37 samples list view popup menu display selected samples 5 39 5 40 select all 5 39 samples list window 5 5 samples view detailed list format 5 40 list format 5 40 popup menu 5 39 popup menu dialog box 5 39 save as 5 23 saved parameters E 3 scheduled 5 16 scheduling tab 5 14 properties dialog box 5 15 schematic B 3
87. rosol source to the Sample Inlet connector and start measurement when the instrument is warmed up The primary window will display the real time current and flow readings Push the down arrow _Y to view particle concentration b To view or configure the instrument settings follow the steps in To View or Configure User Settings If the zero offset needs to be reset connect a High Efficiency Particulate Air HEPA Filter to the Sample Inlet connector Allow charged particles already within the system to purge observed as a steady current reading before resetting zero offset c To view the instrument status follow the steps in To View Instrument Status To View or Configure User Settings 1 Press the down _ arrow until you reach the User Setting Menu Press Enter _ to enter the Flow Control menu Use the left _4 Jor right arrow to toggle the flow control between on off and manual This setting enables flow control activates the internal flow valve to the value set in the flow setting menu disables flow control which holds the flow valve fully closed or switches to manual flow control where the internal valve is fully open and control is achieved with a user supplied external needle valve or critical orifice Press the down _Y arrow to enter the flow setting menu Use the left 4 or right gt arrow to activate the digit you want to edit flashing number Then use up _4 or down _Y arrow to
88. s Accessing or changing settings using serial commands can invalidate the calibration or possibly cause damage to the instrument Pin Connectors The Model 3068B has a single 9 pin D subminiature connector port on the back panel The communication port is configured at the factory to work with RS 232 type devices Table D 1 lists the signal connections Table D 1 Signal Connections for RS 232 Configurations Pin Number RS 232 Signal 1 5 2 Transmit Output 3 Receive Input 4 Reserved 5 GND 6 ne 7 8 gt 9 D 1 Serial Protocol Baud Rate 115 200 Data Bits 8 Parity None Stop Bits 1 Handshaking None Serial Commands To communicate with the Model 3068B requires a terminal program The HyperTerminal program that is included as part of Windows XP is satisfactory Connect to the Model 3068B as follows 1 Open the HyperTerminal program by selecting Start Programs Accessories Communications HyperTerminal 2 Enter a name for the connection for example TSI 3068B Ye New Connection HyperTerminal 101 xi File Edit View Call Transfer Help oel 2 ala Y New Connection Enter a name and choose an icon for the connection Name Ts1 30688 Cancel Disconnected l uto detect Auto detect SCROLL CAPS Num Capture Print echo Figure D 1 Connection Description 3 Enter the communications COM port D 2 Model 3068B Aerosol Electrometer Connect
89. s a directory folder called Aerosol Instrument Manager on your hard disk assuming you accepted the default directory name The directory contains the required program files and sample data files The setup program also creates a new item in the Start Menu called TST and an icon for the Aerosol Instrument Manager Note Before creating a TSI menu item the setup program checks for an existing one If one is present it adds the icon only Model 3068B Aerosol Electrometer Getting Started This section is designed to give you an introduction to the basic operation of the Aerosol Instrument Manager software Using it you will Q Q D O0 0 0 UO O Start the program Open an existing file from the example files provided with the program Change how data is viewed View another sample in the same file Playback review the graphs for several data samples in a slide show fashion Select a data hot spot Zoom in and zoom out on data in a graph Print information displayed on the desktop Export data to a file Arrange the windows that are open on the desktop Quit the program Start the Program To start the program proceed as follows From the Windows desktop press the Aerosol Instrument Manager icon or press the Start menu and then select All Programs TSI Aerosol Instrument Manager The Aerosol Instrument Manager desktop appears as shown in Figure 5 1 Aerosol Instrument Ma
90. size it as desired You can hide a toolbar by selecting the x in the upper right corner Sample Menu The Sample menu lets you navigate through files with multiple samples Model 3068B Aerosol Electrometer Sample Window Help Begimning sampe EB Previous Sample AGE Next Sample Alt N Ending Sample Alt E Delete Undelete Sample Del Select All Cin A Figure 5 24 Sample Menu Note You can also navigate through files with multiple samples using the Navigation toolbar Beginning Sample Select Sample Beginning Sample or from the toolbar to display the data for the first sample of the file in the active window Previous Sample Select Sample Previous Sample or la from the toolbar to display the data for the previous sample of the file in the active window Next Sample Select Sample Next Sample or from the toolbar to display the data for the next sample of the file in the active window Ending Sample Select Sample Ending Sample or nl from the toolbar to display the data for the last sample of the file in the active window Delete Undelete Sample Select Sample Delete Undelete Sample or X from the toolbar to mark a sample for deletion or to unmark a sample that has been previously marked for deletion Sample data that is marked as deleted are not physically deleted from the file until you select File Save Select All Select Sample Select All to select highlight all sampl
91. sol Electrometer Figure 1 1 provides accurate and sensitive measurements of the total net charge on aerosol particles If the particle charge distribution is known particle concentration can be calculated from the charge measurement accurately This instrument can be used to measure the output of instruments such as the TSI Model 3080 Electrostatic Classifier It can also be used to measure the charged particles directly from aerosol sources Figure 1 1 Model 3068B Aerosol Electrometer When paired with a TSI Electrostatic Classifier the Aerosol Electrometer measures the number concentration of monodisperse 1 1 Software 1 2 aerosol This configuration is used primarily for calibrating and testing particle instruments like Condensation Particle Counters and other sub micron particle counters or sizers This system is called a primary method of generating monodisperse aerosol and measuring its concentration because it depends only on basic measurements such as flow rate voltage and current The Model 3068B Aerosol Electrometer has been updated from the TSI Model 3068A Electrometer to significantly improve performance and provide a state of the art user and computer interface Compared to other electrometers it has a large dynamic range with no range switching necessary It also includes temperature stabilization circuitry that allows it to have very low temperature drift over its operational temperature range The n
92. ss of form may be brought against Seller more than 12 months after a cause of action has accrued The goods returned under warranty to Seller s factory shall be at Buyer s risk of loss and will be returned if at all at Seller s risk of loss Buyer and all users are deemed to have accepted this LIMITATION OF WARRANTY AND LIABILITY which contains the complete and exclusive limited warranty of Seller This LIMITATION OF WARRANTY AND LIABILITY may not be amended modified or its terms waived except by writing signed by an Officer of Seller Knowing that inoperative or defective instruments are as detrimental to TSI as they are to our customers our service policy is designed to give prompt attention to any problems If any malfunction is discovered please contact your nearest sales office or representative or call TSI at 1 800 874 2811 USA or 651 490 2811 Contents Manual History oo0 cscaceccsescissavebvedessdssancuestssnsecsvasdevedteeeesebese secs iv WAITAaNty ccccccccccccccccccceccccccecceccceccecccecccessecssecsecsessceceeecsees Vv Safety ONO O xiii Labels AORTA xiii Description of Caution Symbol occoooccnnnnccnnnccnnnncnnnnicnnnncnnnanons XV Catoia e fads state cbt sneha s devas a van dem aa T Eai RE E aaa e iS XV Warning voro aeran aa E E EE A E RET eases XV Caution or Warning SymbolS occooccnocnnocnniocnnincnnacanccnnacnninns xvi About This Manual ccccccecccececscscscscecscccccesscescecsseeees xv
93. t Spo ierse an eee ete 5 8 Delete Undelete Samples aereos enesis eirinn ir eki eriat 5 9 Zoom In and Out on Data in a Graph ecco 5 9 Print Information Displayed on the Desktop 00 5 10 Export Data to a Eiles nereyi aa e a aE an 5 11 Arrange Open WindoWS cooccnoconoconioconiconiconaccnaccnancncacnnnono 5 12 Q it the PrO STAM ssis sistsei reir naa canes en E seas 5 13 Software Procedur s rarere e e e ie 5 14 How to Set Up Instrument Properties ococcoccncccccnncnncnncnnss 5 14 How To Collect Sample Data oocccoccncccnoccnicanaconacinacinnnnnno 5 19 Software Menus dust ka ASE EE ae ereiast Bau seeen 5 20 Desktop Menus nai nao saainevabvee ss 5 21 Context Sensitive MenuUS coccoocnocnncnncnncnncnncnnncnncnncnncnncnnonns 5 38 Status AA A 5 43 CHAPTER 6 Maintenance ccccccecccscscscscscscecscesccesceees 6 1 Calibration and Performance oooccnoncccnnocnnnnccnnnarononccnnnarononccnnns 6 1 Periodic Maintenance resign aena na Dai dis aaa 6 1 Replacing the Filter Cartridge and Cleaning the INCA A ee vals vp could in TE Eea E sedges does 6 2 Checking the Flowmeter coonccocccnccnocnnoconoconoconocinacinaninaninnic n 6 4 Testing for Leaks sic ciseiesidiss eas aeeie rrna aar iia arai eani 6 4 Isolating Leaks 6 sicbiasti onc a e a E 6 5 CHAPTER 7 Troubleshooting cccecccecscesccescecscscscececs 7 1 Error Handling i ci ete at aise ei dd i ees 7 1 Noisy Electrometer Output cece eee seeeee n
94. t is included Warning Warning means that unsafe use of the instrument could result in serious injury to you or cause irrevocable damage to the instrument Follow the procedures prescribed in this manual to use the instrument safely Safety XV xvi Caution or Warning Symbols The following symbols may accompany cautions and warnings to indicate the nature and consequences of hazards Warns you that uninsulated voltage within the instrument may have sufficient magnitude to cause electric shock Therefore it is dangerous to make any contact with any part inside the instrument Indicates the connector is connected to earth ground and cabinet ground Model 3068B Aerosol Electrometer About This Manual Purpose This is an instruction manual for the operation and handling of the Model 3068B Aerosol Electrometer and for the Aerosol Instrument Manager Software as it applies to Aerosol Electrometer How This Manual is Organized This manual describes the Aerosol Electrometer and the Aerosol Instrument Manager software for the Aerosol Electrometer and includes information such as Q Q The manual starts with a product overview and introduction There is information about unpacking and setting up the system and a description of controls indicators and connectors Operating the Aerosol Electrometer Requirements for loading and running the software The installation procedure that loads the program
95. ted using a particle generation instrument Depending on the test aerosol material and size range the particle generation instrument can be a TSI Model 3480 Electrospray Aerosol Generator a TSI Model 3076 Constant Output Atomizer or a tube furnace The polydisperse aerosol from the generator first passes through a dilution bridge which controls the aerosol concentration Next the differential mobility analyzer DMA and the classifier select particles of a give mobility diameter The sheath to aerosol flow ratio of the DMA is typically set at 10 1 to ensure a narrow monodisperse size distribution Filtered makeup flow is added downstream of the DMA to maintain a flow balance A mixing orifice is used to enhance the turbulent mixing and ensure uniform aerosol concentration The aerosol flow then splits to the test CPC and the Aerosol Electrometer Although only one test CPC is shown in this setup multiple CPCs can be tested at the same time Because the DMA classifies particles according to their electrical mobilities a small fraction of multiple charged particles of larger C 1 sizes will pass through the DMA with singly charged particles of the set size The multiple charged particles will cause experimental error not only because these particles are larger than the set size but also the electrometer detects them as multiple particles of one charge One rigorous way to correct the experimental error due to multiple charging is to carr
96. th it If there are windows open on the desktop from more than one file Close will close only those windows associated with the file whose window is currently active If you attempt to close a file that has been changed but not saved you will be prompted to save the changes before closing the file If you have marked a sample or samples for deletion but have not saved the file you will get the following message Some samples have been marked for deletion Do you want them permanently removed If you click Yes the samples marked for deletion are permanently deleted If you click No the samples marked for deletion are not deleted They are saved and are no longer marked for deletion Save Select File Save or fal on the toolbar to save sample data to a file If you have marked a sample or samples for deletion but have not saved the file you will get the following message Some samples have been marked for deletion Do you want them permanently removed If you click Yes the samples marked for deletion are permanently deleted If you click No the samples marked for deletion are not deleted They are saved and are no longer marked for deletion Model 3068B Aerosol Electrometer Save As Select File Save As to save data in an existing file to a new filename The file contents are duplicated to the new filename If you want to delete the original filename use Windows Explorer to do so After you select Save As y
97. the Computer in Chapter 2 of this manual if necessary and then open a new Aerosol Electrometer file E68 Before starting a new sample select File Properties or Run Properties The Properties dialog box contains three tabs Scheduling Settings and Communications Scheduling Tab The Scheduling tab lets you select the number of samples the length of each sample how often samples are collected and the start time for the sample You cannot change the averaging interval for a file that already has data If you want to change the averaging interval you must start a new file Figure 5 8 shows an example Properties dialog box showing the Scheduling tab A description of each parameter follows 5 14 Model 3068B Aerosol Electrometer Hectrometer Properties New Sample X Scheduling Settings Communications Sample Sample length Sec Number of samples Total Sample Time 600 x fi 10m Os Averaging Interval Sec m Scheduled OnlyOnce Repeat Every onf om 5 7 Start At Time 12 o T Pt Figure 5 8 Scheduling Tab of the Properties Dialog Box Table 5 1 Descriptions of Scheduling Parameters for an Aerosol Electrometer Sample length Sec This is the amount of time in seconds that data will be collected from the TSI sensor for each sample The initial default value is 120 seconds 2 minutes The maximum value allowed is 86400 24 hours Number of Samples This is the total num
98. the power source before removing the cover or performing maintenance procedures Only a qualified technician should perform this maintenance Error Handling The Electrometer has certain degree of self diagnostics of operating errors An error message will appear in the display in certain circumstance All error messages start and end with If an error occurs refer to the following troubleshooting guide Error message Cause and Solution FLOW METER Flowmeter communication is not working Remove the electrometer cover and check whether the cable to the flowmeter is connected ENGINE Electrometer engine A D converter is not responding Remove the electrometer cover and check whether the white flat cable connected to the electrometer engine block is connected See Figure 3 3 FLOW 0 13 LPM User requested flow cannot be achieved due to insufficient vacuum to draw the flow Try to increase the vacuum If the vacuum is very high and a low flow is set it is possible that the vacuum has to be reduced The status light will blink in one of the following situations Q The flow rate is not within 10 of the specified value or if it is in manual control mode Q The cabinet or aerosol temperature is greater than 50 C or less than 0 C 7 1 Q The flat cable to the sensor is disconnected see Figure 7 1 below e Figure 7 1 Location of the Flat Cable Connected to the E
99. u for an Aerosol Electrometer ccs eeeeeee ee 5 24 D214 Playback Mentira A 5 26 5 15 Format Menu A When A Graph Window Is Active B When A Samples List Window Is Active s 5 27 5 16 The Y Axis Dialog BOX c ic ccceceseceascntsncevecesecnevareeteessnsesaess 5 28 5 17 A The Graph Color Dialog Box B The Table Color Dialog BOX civcevcss tic dic vesssu ses nt anar eee apena an 5 30 Dr 18 Font Dialog BOX mirta d iaa atea id 5 31 DUO View MENU A ida io crios 5 32 D ZO View Table cin isncenisndtesttnsides dde iaa ed nai aaa E RE dad 5 33 B 21S View Statistics ois iescon E ondeee dawg aesies 5 34 D 22 VIEW Settings psr orire riain nae Enar Ea ESA nce dens NE AEEA 5 34 5 23 Instrument Status Dialog coooccnoccnonnnnnnncnnnconnncnnncanaconaso 5 35 5 24 Sample MENU ii eres deveg viewer Tyivb eels bseieete aedee age oes 5 37 5 29 A O 5 38 0 26 Help MEN ad A A cas 5 38 5 27 Samples List View Popup MeNU cccoccnoccnoccnocanaconacinnncnnicnn 5 39 5 28 Samples View in List ForMat occonccnccnnccnnccnoconocanuconuccnnnos 5 40 5 29 Samples View in Detailed List Format occcocccncccncconioconos 5 40 5 30 Table View Popup Menu oocccnccnnncnnccnnconocinnccnnncnnaconiaconicenaso 5 40 5 31 Graph View Popup MeNU occcccccnccnncconocaniconacanacinacinannnnannn 5 41 5 32 Graph View Showing Calculated Concentration 5 42 5 33 Statistics View Popup Menu occocccnccnnoconaconaconacinacinacinnnnnn 5 42 6 1 Electrom
100. uge to the External Vacuum port When the vacuum is at 18 inHg close the valve and monitor the gauge If the vacuum changes by more than 0 1 inHg in 5 minutes see Isolating Leaks below When the charger electrometer chamber leak checks satisfactorily reconnect inlet and outlet tubing to its original state Turn the instrument back on and make sure that the instrument performs as expected If the instrument has been significantly disassembled it may have to be recalibrated Contact TSI customer service for assistance see Chapter 8 6 4 Model 3068B Aerosol Electrometer Isolating Leaks 1 Isolate the leak by wetting suspected joints with clean isopropyl alcohol while the system is under vacuum The alcohol will be drawn into a leaky joint and evaporate which results in a pressure increase in the vacuum gauge 2 After isolating the leak repair it usually by greasing or replacing an O ring or by sealing a fitting 3 Blow low pressure clean dry air through the repaired section to evaporate and remove any leftover alcohol 4 If you cannot find the leak or cannot repair the leak please contact TSI for assistance Maintenance 6 5 CHAPTER 7 Troubleshooting This chapter describes common difficulties that may arise when using the Model 3068B Aerosol Electrometer Suggestions are given for abnormal and offset levels High voltage is accessible in several locations within this instrument Make sure you unplug
101. up MeNU ccooccnocnnccnnncnnncnnncnoncnonananccnacanacano 5 41 Statistics View Popup Menu occoccnccnccnccnccnncnncnncnnccnanannnncnno 5 43 Maintenance Schedule ooocccoccnnccnnccnnncnnncnnnononanonanunacunananeno 6 1 Specifications of the 3068B Aerosol Electrometer A 1 Signal Connections for RS 232 Configurations D 1 Error Messages for Aerosol Electrometer ooocconoccncnccnnnicnns H 1 Contents xi Labels Safety This section gives instructions to promote safe and proper handling of the Model 3068B Aerosol Electrometer There are no user serviceable parts inside the instrument Refer all repair and maintenance to a qualified technician All maintenance and repair information in this manual is included for use by a qualified technician To prevent problems take these precautions Q Do not remove any parts from the instrument unless you are specifically told to do so in this manual Q Do not remove the instrument housing or covers while power is supplied to the instrument Caution If the Model 3068B is used in a manner not specified by the manufacturer the protection provided by the equipment may be impaired High voltage is accessible in several locations within this instrument Make sure you unplug the power source before removing the cover or performing maintenance procedures The Aerosol Electrometer has six labels shown in Figure S 1 Figure S 2 and Figure S 3 They are descri
102. us by clicking the right mouse button when the cursor is in an active window Each window has a popup menu as shown Model 3068B Aerosol Electrometer below The table following each popup menu describes where to find a description of that menu item Samples View Popup Menu Large Icons Small Icons List v Detail Figure 5 27 Samples List View Popup Menu Table 5 4 Samples List View Popup Menu Menu Item For a description see Large Icons Below Small Icons Below List Below Detail Below Select All Below Properties Run Menu Export File Menu Select All Select this option to select highlight all samples in the Samples List window for exporting Large Icons or Small Icons Use this option to display samples in the samples view as either large or small icons List Use this option to display samples in the samples view in a list format Aerosol Instrument Manager Software 5 39 Hectrometer Samples List AIM1_E68 Viewing Sample 2 Figure 5 28 Samples View in List Format Detail Use this option to display samples in the samples view in a detailed list format The date and time file name and sample title are displayed Bectrometer Samples List AIM1 E68 01 26 06 13 39 00 C dev aim v7 testing AIM1 E68 01 26 06 14 40 00 C dev aim v7 testing AIM1 E68 Figure 5 29 Samples View in Detailed List Format Table View Popup Menu
103. us due to Before sampling begins Aerosol Instrument Manager communication error verifies the status of the instrument It was unable to read the instrument status H 1 Error Message The start time selected for the view boundary cannot exceed the end time Attempt to exit Aerosol Instrument Manager during a sample run Attempt to save a file with no sample data You have selected a file that is part of a sequence of files You can select Yes to view all the files or No to view only the file you initially selected Properties Scheduling values are invalid The boundaries range is invalid You must stop data collection before exiting Aerosol Instrument Manager There is no data to be saved The file you have selected is part of a sequence of files Do you want to view all the files The User Defined inter sample time is less than the sample length The starting hour is invalid The Hours field cannot be blank The Minutes field cannot be blank The number of samples cannot be zero The sample length cannot be zero The Averaging Interval cannot be zero The Sample Length should be equal to or greater than the Averaging Interval The maximum data points allowed are 28 800 You You must enter a value greater than 0 in this field You must enter a value greater than 0 in this field You must enter a sample length equal to or greater than the averaging interval The sample length divided by the averagi
104. value for the average charge per Charge C particle according to your sample stream This value must be between 0 01 60 0 coulombs Offset fA This is the zero offset value read from the instrument and stored with each sample The electrometer current values sent by the instrument already have this offset value subtracted from them It is listed for diagnostics only If the number is very large over 100 fA the instrument may not have been zeroed properly Communications Tab The Communications tab lets you set up and test the communications port It is only available when you are connected to an instrument You can tell you are connected when the New Sample icon is the last icon in the Sample View or you see the text Connected in the status bar Figure 5 10 shows the Communications tab for the Aerosol Electrometer Table 5 3 describes the fields and buttons of the Communications tab for the Aerosol Electrometer model Hectrometer Properties New Sample X Available Connections If available double click on one of the ports to connect COM1 hn Connected Figure 5 10 The Communications Tab of the Properties Dialog Box for an Aerosol Electrometer 5 18 Model 3068B Aerosol Electrometer Table 5 3 Descriptions for the Communications Tab Port Lists the ports available on your computer system and lets you select the port that is connected to the TSI sensor This may be a serial or USB port Displays the i
105. ved or corrupted the software opens the files until it comes to the missing file For example if you try to open a sequence of files that contains seven files and the fourth file is missing only the first three files can be opened Files five six and seven are orphaned These remaining files 5 6 and 7 can only be opened individually not as a sequence Model 3068B Aerosol Electrometer APPENDIX H Error Messages This appendix lists the messages you may encounter when using the software and suggests the action you should take Table H 1 Error Messages for Aerosol Electrometer Error Message Description lt file gt already exists Do you want to append to it The text file selected already exists New exported data will be appended to the end of the file O is invalid when using a log y scale You must enter a number greater than zero to proceed O is not valid for the maximum value You must enter a number greater than zero to proceed The connected instrument is not an Aerosol Verify the type of instrument you are connected to and Electrometer 3068B the file type you opened For example If you opened a file of type c75 then it is expected that you will connect to a CPC 3775 Cannot communicate with the instrument Please Communications error the software cannot check that it is connected turned on has the correct communicate with the instrument Please check the comm settings set in the properties and
106. w Call Transfer Help Da AE ESE E HELP Help Read Help Set Help All Help x where x Command Name 4 gt Connected 0 01 11 ANSIW 115200 8 N 1 SCROLL kz Figure D 5 Help Commands List 2 Select Transfer Capture Text 3 Define a file name and directory to store the serial command list and hit Start 4 Type HELP ALL in the terminal window and hit Enter Select Transfer Capture Text Stop The command list is capture in the text file for easy reference Serial Commands APPENDIX E Data Files Project Files and Stored Parameters The Aerosol Instrument Manager stores data in two types of files data files and project files This appendix describes those files and the parameters stored in them In addition it also describes the parameters stored in the aim ini file Data Files and Project Files The Aerosol Instrument Manager uses two types of files UA Data files QO Project files Data files contain sample data They have a filename extension to indicate the type of sensor from which data was collected such as E68 for a Model 3068B Aerosol Electrometer Other information stored in data files includes Information stored for the whole file Number of samples in file Instrument Model Information stored for each sample Instrument ID Sample length Averaging interval Comment Sample title Time sample started Status flags from the instrument Sample flow rate Average charge
107. w Control Press this button to toggle the flow control between on off manual mode Flow Set Point Press this button to enable the window and enter a new set point value This value must be between 0 3 10 L min Avg Particle Press this button to enable the window and enter a Charge new average charge per particle This value must be between 0 01 60 coulombs Analog Output You may select one of the analog output modes Mode from this dropdown Zero the Press this button to begin zeroing of the Electrometer electrometer This process takes 60 seconds to complete See Chapter 7 Troubleshooting section Unstable Zero Offset Level for a detailed description of this procedure Toolbars Select View Toolbars to display or hide the toolbars that appear on the desktop Each toolbar is illustrated below Osea Bb me Bw SAR Color and Font Toolbar og Lal la _ S Graph Toolbar MAI gt AA Navigation Toolbar By default only the Main and Navigation toolbars are displayed To view what each icon tool does position the cursor on the icon A balloon will appear to describe the function of the icon Toolbars can be moved and resized if desired To move a toolbar position the cursor on a gap between two toolbars and press and hold the left mouse button As you move the mouse the toolbar moves with it To resize a toolbar position the cursor at an edge or corner of the toolbar window that you have moved and re
108. y Ctrl C Instrument Status Ctr Toolbars gt Figure 5 19 View Menu Graph Select View Graph to open a graph window that displays the file s sample data based on electrometer current or calculated concentration Table Select View Table to open a table window that displays the file s sample data which includes electrometer current and calculated concentration Model 3068B Aerosol Electrometer Data Table myoffice_42606 E68 Figure 5 20 View Table Aerosol Instrument Manager Software 5 33 Statistics Select View Statistics to open a window of statistical information for the active sample Statistics Table myoffice_42606_E68 Electrometer Calculated Current fA Concentration cm 0 129 29 7 Std Dev RMS 0 677 Min EE 1 00e 03 Sample Length 01 00 00 Sample 1 Disconnected E Figure 5 21 View Statistics Note The equation for calculated concentration and RMS is described in Chapter 7 under the section Noisy Electrometer Output Settings Select View Settings to view the settings for the current sample Settings Table myoffice_42606_E68 Iof x Title Model 3068B Instrument ID 3068 70552138 1 0 56 Start Time 04 26 06 16 02 00 Sample Length dd hh mm ss 00 01 00 00 StopTime 04 26 06 17 02 00 Averaging Interval hh mm ss 00 00 01 Sample Flow Rate Ipm 5 00 Average Particle Charge coulombs 1 00 Instrume
109. y out a Tandem Differential Mobility Analysis TDMA experiment to determine the fraction of multiply charged particles and correct the efficiency data One simpler way to minimize the multiple charging effects is to sample the test monodisperse aerosol from the right hand side of the mode of the polydisperse aerosol from the generator In that case the polydisperse particle size distribution is first scanned with the DMA connected to a reference CPC i e a SMPS system And then the DMA voltage is set to select the test aerosol from the right hand side of the size distribution Particle concentration needs to be controlled in a proper range during CPC calibration If the particle concentration is too high the CPC will have large coincidence error If the particle concentration is too low the electrometer will have low signal to noise ratio Therefore it is a good practice to choose an intermediate concentration that has relatively low CPC coincidence error and statistically significant electrometer signal Note that the indicated CPC concentration should be corrected for coincidence error and the electrometer reading should be corrected for zero offset In order to keep the particle diffusional losses the same different flow paths need to be symmetrical i e to keep the flow rates and tube lengths from the flow splitter to the CPC Electrometer inlet the same However if the particle concentration is low or the electrometer noise is

Model 3068B Aerosol Electrometer User`s Manual

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