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PICARRO G2307 User Manual

Analyzer for formaldehyde
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G2307 Analyzer for Formaldehyde
User Manual
Picarro, Inc.
3105 Patrick Henry Drive
Santa Clara, CA 95054, USA
Phone: +1 408 962 3900
www.picarro.com
Document Number 40-0057 Rev. B

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  • Page 1 G2307 Analyzer for Formaldehyde User Manual Picarro, Inc. 3105 Patrick Henry Drive Santa Clara, CA 95054, USA Phone: +1 408 962 3900 www.picarro.com Document Number 40-0057 Rev. B...
  • Page 2 NOTICES DISCLAIMER AND RESERVATION OF RIGHTS Picarro has prepared this manual solely for the information and use by its customers as a guide for the selection, installation, operation, and maintenance of the products described.
  • Page 3 Email: orders@picarro.com Phone: +1 408 962 3992 © 2020 Picarro, Inc. All rights reserved. 3105 Patrick Henry Drive Santa Clara, California, 95054 USA Phone +1 408 962 3900 • Fax +1 408 962 3200 www.picarro.com Picarro G2307 Analyzer User Manual...

  • Page 4: Table Of Contents

    11.2 CALIBRATION METHODOLOGY ........................47 11.3 CALIBRATION SOFTWARE UTILITY TOOLS ....................50 12. TROUBLESHOOTING .................... 57 12.1 POWER LED ON ANALYZER DOES NOT ILLUMINATE ................57 12.2 USER INTERFACE PROGRAM DOES NOT START ..................57 Picarro G2307 Analyzer User Manual...
  • Page 5 16. APPENDIX A – REMOTE DATA ACCESS ............78 17. APPENDIX B – THE DATA FILE VIEWER ............81 18. APPENDIX C – EXTERNAL VALVE SEQUENCER ..........93 19. APPENDIX D – DATA LOG PARAMETERS ............98 Picarro G2307 Analyzer User Manual...

  • Page 6: Introduction To Technology

    Spectroscopy (CRDS), on the other hand, is one thousand to one million more times sensitive. In Picarro analyzers, light from a single-frequency laser enters a cavity where three mirrors reflect the laser light as seen in Figure 1. The light...

  • Page 7: Relating Ring-Down Time To Absorption Intensity

    Determining absorption intensity at a specific wavelength requires comparing the ring-down time of an empty cavity to the ring-down time of a cavity that contains gas. Picarro instruments gather measurements from an “empty” cavity by switching the light to wavelengths that are not absorbed by the target molecules.

  • Page 8: Converting Absorption Intensity To Concentration

    The height of the peak is calculated by subtracting the maximal absorbance from the baseline absorbance. Figure 3 shows a plot of ideal optical spectra with a clean, uniform baseline on either side of the absorption peak. Picarro G2307 Analyzer User Manual...

  • Page 9: Spectral Precision And High Sensitivity Measurements

    A particular absorption peak may be visible between lines, but the absorption may not return to the baseline before it rises in response to another molecule. Picarro analyzers calculate the baseline underneath a poorly resolved peak by modeling the absorption peaks from other surrounding molecules and subtracting contributions from neighboring peaks to the absorption intensity.
  • Page 10 For precise pressure control, the cavity pressure is monitored using a high- linearity pressure transducer. The system computer uses this pressure data in a feedback loop to control proportional valves that adjust the inlet and outlet gas flow of the cavity. Picarro G2307 Analyzer User Manual...

  • Page 11: Conventions

    LASER WARNING alerts you of a laser danger. WARNING CAUTION alerts you of a potential danger to equipment or to the user. CAUTION REMINDER is a helpful hint to procedures listed in the text. REMINDER Picarro G2307 Analyzer User Manual...

  • Page 12: Acronyms

    This manual includes various acronyms. For definitions, see below: Acronym Definition CRDS Cavity Ring-Down Spectroscopy Graphical User Interface centimeters millimeters ” (as in 1/4”) Inches Formaldehyde Methane Water Hotbox Warm box Parts Per Million Parts Per Billion ‰ per mil °C degrees Celsius Picarro G2307 Analyzer User Manual...

  • Page 13: Safety

    SAFETY 4.1 General Safety CDRH Certification This Picarro Analyzer complies with 21 CFR Chapter 1, sub-chapter J, and is classified as a Class 1 laser system when all panels and covers are on. CE Certification This Picarro Analyzer complies with the European standards and the instrument is affixed with a CE label.

  • Page 14: Laser Safety

    Only operate or service this device in accordance with the instructions in this guide, and only open the device in an approved WARNING laser safe service area using appropriate laser-safety glasses. The following Laser Safety Label is affixed to the inside of the analyzer: Picarro G2307 Analyzer User Manual...
  • Page 15 Figure 4: Laser Safety Label Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. WARNING Picarro G2307 Analyzer User Manual...

  • Page 16: Unpacking The Analyzer

    UNPACKING THE ANALYZER 5.1 Inspect the Shipping Boxes Picarro products are inspected and tested before leaving the factory. Their packing containers have been designed to keep the equipment safe from damage during transit. Inspect the condition of the boxes upon arrival. The larger box includes the analyzer and most of the accessories.
  • Page 17 Control Cable (1) For External Solenoid Valves Nut (1) and For connecting input line to analyzer INPUT Ferrules (2) Document Packet Includes this manual, certificate of compliance, and Windows License. USB Flash Drive Contains backup software. Picarro G2307 Analyzer User Manual...
  • Page 18 A/C Power A power cable with connectors appropriate to your Cable (1) country is provided. Vacuum Hose (1) Hose to connect the pump to the analyzer. Pump Manual (1) Detailed instructions for pump. Picarro G2307 Analyzer User Manual...

  • Page 19: Analyzer Overview

    ANALYZER OVERVIEW 6.1 Intended Use The G2307 Analyzer measures concentrations of CH O and H simultaneously and precisely using Picarro’s patented Cavity Ring-Down Spectroscopy (CRDS) technology. The analyzer can be deployed in a lab or in the field, allowing in-situ analysis for both trace and ambient amounts of O and H O monitoring applications.

  • Page 20: Analyzer Specifications

    Steady-state Power 120 W (Analyzer), 150 W (Pump) Steady-state operation Mains Supply Voltage ±10% of the nominal voltage Fluctuation Minimum Rated Circuit 10 A @115 VAC Amperage 5 A @230 VAC Liquid Ingress Protection None Picarro G2307 Analyzer User Manual...

  • Page 21: Installation

    INSTALLATION This section describes the setup and installation of the Picarro Analyzer. Please read and understand this section thoroughly before proceeding with the installation. Using this analyzer in a manner not specified by Picarro may result in damage to the analyzer and render it unsafe to operate.

  • Page 22: Analyzer And Vacuum Setup

    1. Remove the Analyzer and the External Vacuum Pump from their respective shipping containers. This analyzer weighs 47 lbs. (21.3 kg). Use the technique outlined in the General Safety section on page 14 when lifting or moving the analyzer. WARNING Picarro G2307 Analyzer User Manual...
  • Page 23 7. Connect the analyzer to a power source using the supplied AC power cable. Use the AC power cables supplied with the analyzer or a similarly rated cable. Check with Picarro technical support if you have questions about power cable replacement. An inadequately rated power cable can CAUTION result in equipment damage.

  • Page 24: Connecting To The Analyzer Inlet

    2. Loosely connect the nut to the INLET on the back panel of the analyzer about a full turn, being careful not to let the ferrules fall out. 3. Insert the tubing into the back of the nut, feeding it in as far as possible without deforming the tubing. Picarro G2307 Analyzer User Manual...

  • Page 25: Setting Up A Monitor, Keyboard, And Mouse

    3. Connect a monitor to one of the DVI monitor ports. The analyzer will detect the connection and adjust the resolution to match the monitor. 4. Connect the monitor to a power source. 5. Turn on power to the monitor. Picarro G2307 Analyzer User Manual...

  • Page 26: Analyzer Basic Operation

    Throughout this manual, some of the GUI screenshots may be generic and/or not specific to the actual gas being analyzed. These figures are examples of universal analyzer functions and are used for training NOTE purposes. Picarro G2307 Analyzer User Manual...

  • Page 27: Desktop Icons And Folders

    3. Picarro Mode Switcher: When clicked, you will be led to a window that will allow you to switch between various measurement modes. Most analyzer models are configured for one mode and may not include the Mode Switcher.
  • Page 28 Do not disconnect the AC power to the analyzer, vacuum line or the AC power to the External Vacuum Pump while analyzer is operating. Damage may be caused by current surges if power is applied while attaching or CAUTION removing cables. Picarro G2307 Analyzer User Manual...

  • Page 29: Shutdown Procedure

    CAUTION instrument cools from its operating temperature. Do not turn off the pump or disconnect the vacuum line while the instrument is operating. CAUTION Picarro G2307 Analyzer User Manual...

  • Page 30: In Case Of An Electrical Power Outage

    If the power to the analyzer is cut-off for any reason, the analyzer will cease operation. However, when the power is reapplied, the analyzer will restart automatically. The Picarro software tools will also properly close out previous files and open new files for data collection so that previously collected data, instrument diagnostics, and other parameters recorded up to the time of power outage are retained.

  • Page 31: List Of Gui Functions

    LIST OF GUI FUNCTIONS 9.1 GUI Overview The features of the Picarro analyzer GUI are identified in Figure 11 and described in the following sections. Figure 11: Layout of the Analyzer GUI The heading may vary depending on the analyzer model.

  • Page 32: Alarm Panel

    Tools Menu This menu item has three entries: 1. User Calibration: Opens the user calibration window (default password is “picarro”). The password can be reset in the QuickGui.ini file in the instrument directory C:\Picarro\G2000\AppConfig \Config\QuickGUI\ under the section [Authorization] UserCalPassword = Picarro Show/Hide Valve 2.

  • Page 33: Instrument Status

    The filename and path of the active data log are displayed in this pan. The indicator is grayed-out if there is no active data log (i.e., if a new data log has not been started using the Start /Stop New Data Log Button). A new file Picarro G2307 Analyzer User Manual...

  • Page 34: Data Window

    “sensors” is selected, the analyzer’s optical cavity pressure or temperature can be viewed as well as the nominal ambient temperature of the analyzer (“DAS temp”) and the temperature of the analyzer’s electronics chamber, indicated as “warm chamber temp.” Picarro G2307 Analyzer User Manual...
  • Page 35 This buffer is empty upon instrument startup and can also be emptied by pressing the reset data buffer button in the lower-right-hand corner of the GUI. Figure 18: Data Buffer and Reset Buffer Picarro G2307 Analyzer User Manual...
  • Page 36 These numbers change to reflect statistics of whatever data is in the data window. Figure 20: Digital Readout Picarro G2307 Analyzer User Manual...

  • Page 37: Status Log Window

    3. Pressure Stabilizing/Locked The valve control system begins to allow flow through the analyzer and stabilizes the pressure inside the cavity. 4. Measuring This is the normal mode of operation after startup has completed. Picarro G2307 Analyzer User Manual...

  • Page 38: File Management

    After each data file has been closed it is moved to an archive directory, and a new file is started in the original location. The archive directory is C:\Picarro\G2000\Log\Archive\ and has subdirectories DataLog_Mailbox, DataLog_Private and DataLog_EventLogs with files arranged by year\month\day\hour.

  • Page 39: Data File Archival And Automatic Deletion Of Old Files

    C:\Picarro\G2000\Log\Archive\DataLog_Private \[year]\[month]\[day]\[hour] Current Data File The current data file can be found in C:\Picarro\G2000\Log\DataLogger\. Within this directory, there are subdirectories for DataLog_Private, DataLog_User, and DataLog_User_Sync. Similarly, the archive directory has subdirectories arranged by file type. The subdirectories are further organized by \[year]\[month]\[day]\[hour].

  • Page 40: Setup Tool

    Not all features of the analyzer are available on the serial interface. For details on how to use the serial command interface, please see the Picarro Analyzer Programming Guide (included in pdf format on the installation CD).
  • Page 41 TCP/IP. • Data Streaming: specify the port for data streaming (COM1/COM2/Off) • Valve Sequencer MPV: specify the port for connecting to Valve Sequencer (COM1/COM2/Off) • Command Interface: specify the port for Command Interface (COM1/COM2/ TCP/Off). Picarro G2307 Analyzer User Manual...
  • Page 42 • Subject: subject line of the email. • Data Directory: Location of the data you want email. After making the appropriate edits, click “Apply” to put changes into effect and then “Exit” to close the window. Picarro G2307 Analyzer User Manual...
  • Page 43 “GUI Properties” tab. 3. Click “Apply” to put changes into effect and then “Exit” to close the window. You should now be able to access the “Show/Hide Valve Sequencer GUI” menu from the main GUI under “Tools” Picarro G2307 Analyzer User Manual...
  • Page 44 Datalog_User and DataLog_User_Sync. Data Streaming outputs data continuously, whereas the Command Interface needs commands to prompt data output. After making the appropriate edits, click “Apply” to put changes into effect and then “Exit” to close the window. Picarro G2307 Analyzer User Manual...
  • Page 45 Figure 25: Command Interface Window Figure 26: Data Streaming Window Picarro G2307 Analyzer User Manual...
  • Page 46 Customizing Analog Output Channels (if applicable) The Picarro analyzer may be optionally configured with an Electrical Interface Card (EIC) that provides up to 8 analog signals available to the user for monitoring various measurements results and analyzer parameters. The Electrical Interface tab allows you to customize each analog output channel.

  • Page 47: Calibration

    11.1 Slope and Offset Every Picarro analyzer ships with a default user calibration value of 1 for slope and 0 for offset. While new user calibrations will likely result in changes to both, we recommend that only offset changes are applied during more frequent calibrations.
  • Page 48 1 - 3 psi. Users calibrating from a formaldehyde standard directly should use a regulator with appropriate treatments, thread, and delivery pressure. Picarro recommends the Airgas Y12HG445AA350-AG, which comes ® with a CGA 350 thread and internal passivated surfaces (SilcoNert ®...
  • Page 49 “y” using the analyzer’s data “x” so that: Data corrected = 0.9866•Dataraw+5.268 Figure 28: Linear Calibration Example Calibration values are input into the analyzer by selecting Tools > User Calibration, and then entering the slope and intercept for each species. Picarro G2307 Analyzer User Manual...

  • Page 50: Calibration Software Utility Tools

    Data Recal GUI The Picarro Data Recalibration (“Data Recal”) software can be found in the “Picarro Utilities” folder on the desktop. The Data Recal software utility can be launched by double-clicking on the Data Recal Icon in the folder. Shown below is a screenshot of the window that will open.
  • Page 51 Certified and CRDS reported values are entered in the white boxes. Standards that will be used for instrument recalibration are then selected by checking the corresponding box in the first column, labeled “Used for Recal.” Picarro G2307 Analyzer User Manual...
  • Page 52 Click “Compute” to calculate the new calibration parameters. These parameters will appear in the Calibration output section of the GUI, and an asterisk “*” will be displayed at the end of the window title line, indicating the new change. Picarro G2307 Analyzer User Manual...
  • Page 53 The bottom graph shows the residuals, which shows how far each measurement is from the best-fit line. If you decide to accept the new calibration values based on this plot, click on the “Apply New Cal” button. Picarro G2307 Analyzer User Manual...
  • Page 54 Saving these files enables you to track the instrument recalibration history. Saved files can be reloaded by clicking “File” in the upper left corner of the window and selecting “Load Recalibration File.” Figure 38: Delta Recalibration Load File Picarro G2307 Analyzer User Manual...
  • Page 55 Recal GUI before accepting the new recalibration values, you will be prompted to confirm your choice through a pop-up window. This window contains a warning that continuing to exit will cause the new calibration data to be lost. Picarro G2307 Analyzer User Manual...
  • Page 56 NOTE to be used for recalibration; (3) the “offset + slope” calibration option is selected. This error occurs because the entered values will lead to an erroneous zero-slope value. Figure 43: Invalid New Slope Entry Picarro G2307 Analyzer User Manual...

  • Page 57: Troubleshooting

    The following section lists problems that may be encountered during installation and operation of the analyzer. The corresponding step-by-step procedures provide resolution in most cases. If, after attempting these procedures, the problem remains unresolved, please contact Picarro Technical Support. 12.1 Power LED on analyzer does not illuminate Context: Turning on the analyzer by momentarily depressing its front panel power switch should apply power.

  • Page 58: Sample Pressure Cannot Be Controlled To The Appropriate Value For Concentration Measurements

    If the computer does not respond to the mouse, hold down the power switch on the front panel for a few seconds until the computer and the instrument turn off. After another few seconds, restart the analyzer by momentarily depressing the power button. Picarro G2307 Analyzer User Manual...

  • Page 59: Service And Maintenance

    13. SERVICE AND MAINTENANCE 13.1 Consumables and Replacement Parts The following parts can be ordered directly from Picarro as needed over the lifetime of the analyzer. For contact information please see page 3 Part Description Expected Servicing Number Frequency S1020...
  • Page 60 Figure 45: Remove this Remove the foam. foam cover. Loosen this retaining nut on the input bulkhead. 6. Using the 9/16” and 11/16” wrenches, loosen two nuts that are connecting the filter to the analyzer. Picarro G2307 Analyzer User Manual...
  • Page 61 Figure 46: Nut Removal Process: Loosen the Fitting Nut first. Figure 47: Loosen Input and Output Filter Nuts Picarro G2307 Analyzer User Manual...
  • Page 62 1. Remove the filter from its packaging. 2. Using the 9/16” and 11/16” wrenches, attach it to the two nuts. The arrow on the filter needs to point away from the back of the analyzer. Picarro G2307 Analyzer User Manual...

  • Page 63: Case Fan Assembly Replacement

    3. Locate the PCBA. Safely remove the power connectors out from the PCBA. 4. Locate the 40 mm fan assembly. Use 1/4” wrench to remove all the four screws and replace with the new fan. Picarro G2307 Analyzer User Manual...

  • Page 64: Cpu Fan Replacement

    2. Flip the analyzer so that it rests upside-down and the bottom layer is accessible. 3. Open the bottom cover. 4. Locate the Mother Board. Locate the CPU fan, unscrew all four corner screws and Replace with the new fan. Picarro G2307 Analyzer User Manual...

  • Page 65: Replacing Vacuum Diaphragms And Valves

    Carry out maintenance frequently if the pump is exposed to corrosive media or in CAUTION case of deposits. Service only one side of the pump at a time to avoid the mixing of parts. CAUTION Picarro G2307 Analyzer User Manual...
  • Page 66 Required Tools A Pump Rebuild Kit (part number S2009) can be ordered directly from Picarro and includes 4 diaphragms, 8 valves, a 46 mm diaphragm key, and a silicone rubber tube for the pump’s silencer. In addition to the above, you will also need the following tools: •...
  • Page 67 Loosen the nut securing the housing cover 2. With the Phillips screwdriver, remove the two screws at the base of the pump handle and then carefully dislodge and remove the handle. Figure 55: Removing the handle Picarro G2307 Analyzer User Manual...
  • Page 68 Remove the head cover and valves you would like to inspect. It is recommended to only service one side at a time. Figure 57: Visually inspect the valves Picarro G2307 Analyzer User Manual...
  • Page 69 If the valves appear worn or show damage, replace with new valves provided in the S2009 Pump Rebuild Kit. Figure 59: Signs of damage to the valves and diaphragm Picarro G2307 Analyzer User Manual...
  • Page 70 Do not use any sharp tools as this can damage the diaphragm. Figure 60: Lift the edges of the diaphragm 2. Align the 46 mm diaphragm key with the edges of the diaphragm support disc. Figure 61: Align the diaphragm key Picarro G2307 Analyzer User Manual...
  • Page 71 Figure 63: Correct diaphragm orientation 5. Align the square head of the diaphragm clamping disc with the opening on the diaphragm support disc and make sure it is properly seated. 6. Replace any washers as necessary. Picarro G2307 Analyzer User Manual...
  • Page 72 Figure 64: Confirm the number of washers 8. Apply pressure and turn the diaphragm key clockwise to secure the components. Replacing the Valves and Assembling Pump Heads Figure 65: Visually inspect diaphragms Picarro G2307 Analyzer User Manual...
  • Page 73 Replace the head covers and valves over the diaphragm clamping discs. Figure 67: Replace housing cover 3. Replace the housing cover. 4. Align the housing cover with the screw holes in the housing. Picarro G2307 Analyzer User Manual...
  • Page 74 • In case of an unusual noise, switch off pump immediately and check camping disc positions. • If the ultimate vacuum is not achieved after break-in period, check hose connectors at pump heads for leaks. • If necessary, recheck valve seats and pump chambers. Picarro G2307 Analyzer User Manual...

  • Page 75: Cleaning

    13.6 Cleaning Clean the outside of the analyzer with a clean dry cloth. Only certified service technicians should access or clean the inside of the analyzer. Picarro G2307 Analyzer User Manual...

  • Page 76: Transportation And Storage

    When shipping or relocating the analyzer, it is important to protect it from mechanical shocks. Failure to do so can compromise its performance. When shipping the analyzer, use its original packaging CAUTION only. Picarro G2307 Analyzer User Manual...

  • Page 77: Limited Warranty

    In addition, a charge for testing and examination may, at Picarro’s sole discretion, be made on any Product so returned. These remedies are available only if: i) Picarro is notified in writing by the Purchaser promptly upon discovery of a Product defect, and in any event within the warranty period;...

  • Page 78: Appendix A - Remote Data Access

    Not all features of the instrument are available on the serial interface. For details on how to use the serial command interface, please see the Picarro Analyzer Programming Guide (included in PDF format on the installation CD).
  • Page 79 • Connection Name: specifies the name of the dial-up connection to use, as listed under Network Connections in the Control Panel. Username and Password must also be specified to make the connection. Picarro G2307 Analyzer User Manual...
  • Page 80 Examples of “RemoteAccess.ini” File [LOGGING] Logfile=c:/temp/RemoteAccessLog [NTP] Server1=time-a.nist.gov Server2=time-b.nist.gov Server3=time-a.timefreq.bldrdoc.gov Server4=time-b.timefreq.bldrdoc.gov Server5=time-c.timefreq.bldrdoc.gov Server6=time.nist.gov Server7=time-nw.nist.gov UpdateClock=1 [DIALUP] ConnectionName=Picarro Dialup Access Username=user Password=password Number=14085551212 [EMAIL] Server=smtp.servername.org Directory=c:/picarro/mailbox From=instrument@picarro.com To1=recipient1@site1.com To2=recipient2@site2.com Subject=CRDS data from Picarro instrument UseAuthentication=0 Picarro G2307 Analyzer User Manual...

  • Page 81: Appendix B - The Data File Viewer

    Open H5 File > Open H5 opens a Picarro data file (HDF5 format) for data analysis and visualization. After opening the data file, you can create a new time series plot. Refer to New Time Series Plot for more information.
  • Page 82 By default, TimeZone is set to your local time zone. However, if data were taken elsewhere, select the time zone where data were taken. Select File > Concatenate H5 files, then click Define date range to specify the desired date range. Picarro G2307 Analyzer User Manual...
  • Page 83 Data files are saved in directory trees named by date and time option. Picarro software saves data in a directory tree that is named by the creation year, month, and day. Select this option if the target folder has this file structure.
  • Page 84 The average is calculated for data in each block, and the results are saved in a new H5 file. The specified block size must be greater than the average data interval. NOTE Picarro G2307 Analyzer User Manual...
  • Page 85 The Time Series Viewer form includes the following menus: Figure 75: Time Series Viewer Menus Time Series Viewer File Menu Use the File menu to save a configuration or take a screenshot. Figure 76: Time Series Viewer – File Menu Picarro G2307 Analyzer User Manual...
  • Page 86 Viewer and save it as a PNG file to a specified filename. Time Series Viewer Analysis Menu Use the Analysis menu to calculate statistics, generate a histogram, and to plot correlations and Allan Standard deviations. Picarro G2307 Analyzer User Manual...
  • Page 87 • Bin: Specifies the number of intervals that the range of values is divided into. • Normalized: When selected, the sum of the histograms is normalized to 1. • Save data: Saves histogram data to a CSV file. Picarro G2307 Analyzer User Manual...
  • Page 88 NOTE the desired unit. The Time Series Viewer Canvas The Time Series Viewer canvas is comprised of interactive graphs and a variety of configuration options. Picarro G2307 Analyzer User Manual...
  • Page 89 HDF5 file. Refer to Concatenate H5 Files on page 82 for more information. Edit Plot properties: Opens the Image Editor form, where the following options can be specified: Picarro G2307 Analyzer User Manual...
  • Page 90 Autoscale Y When the Autoscale Y option is selected, the Time Series Viewer will autoscale on the Y-axis to make sure that all data within the range of the X- axis is displayed. Picarro G2307 Analyzer User Manual...
  • Page 91 For details about the File menu, see Save Configuration on page 86. The canvas in this plot is interactive. For details about the plot canvas, see The Time Series Viewer Canvas on page 88. REMINDER Figure 84: Correlation/XY Plot Picarro G2307 Analyzer User Manual...
  • Page 92 After applying any of the above Analysis options, the results, statistics, or fitting function with coefficients are displayed in the lower portion of the Correlation Plot window. Figure 86: Results of Quadratic Fitting Picarro G2307 Analyzer User Manual...

  • Page 93: Appendix C - External Valve Sequencer

    Tools menu in the GUI. Default Configuration For all models of Picarro analyzers, the rotary valve control is disabled in the factory default setting. The solenoid valve control, however, is ready to use by default for all solenoid valve connectors.
  • Page 94 The Valve Sequencer software allows the user to set steps in which solenoid valves are turned on/off and the rotary selector valve is set to a single position. The Picarro valve sequencer window appears below: Picarro G2307 Analyzer User Manual...
  • Page 95 For each step, select the box for each solenoid valve to be opened. The checkmark in the “current valve state” window indicates a solenoid valve is open. Note: In this example, we assume normally closed (NC) valves are Picarro G2307 Analyzer User Manual...
  • Page 96 To jump to a particular step, increment the “run step 3” and click “Apply.” Both solenoid and rotary valve codes are recorded in columns in the output data files indicating the active valve configuration respective to when data is Picarro G2307 Analyzer User Manual...
  • Page 97 These codes can be used as event timing flags. For example, if no solenoid valves are present, the codes will be recorded regardless of whether a valve is connected or not. Picarro G2307 Analyzer User Manual...

  • Page 98: Appendix D - Data Log Parameters

    Temperature measured at the warm box deg C Species MPVPosition Integer code for the valve position OutletValve DAC output to proportional valve at cavity outlet Solenoid_valves H2CO Mole fraction of formaldehyde, corrected for effect of water vapor Picarro G2307 Analyzer User Manual...
  • Page 99 Battery_Current Current output of battery Ampere Battery_Temperature Temperature of battery deg C Battery_Voltage Voltage output of battery Volt Mole fraction of methane, calibrated but not corrected for effect of water vapor CavityPressure Cavity Pressure Torr Picarro G2307 Analyzer User Manual...
  • Page 100 H2CO_2min 2-min averaged mole fraction of formaldehyde, corrected for effect of water vapor H2CO_5min 5-min averaged mole fraction of formaldehyde, corrected for effect of water vapor Mole fraction of water vapor Percent Picarro G2307 Analyzer User Manual...
  • Page 101 DAC output to Laser 3 thermoelectric cooler Laser3Temp Temperature of Laser 3 dec C Laser4Current Current to Laser 4 (not used on this analyzer) Laser4Tec DAC output to Laser 4 thermoelectric cooler Laser4Temp Temperature of Laser 4 dec C Picarro G2307 Analyzer User Manual...
  • Page 102 ADC output from photodiode monitoring etalon 1 reference beam in WLM Reference2 ADC output from photodiode monitoring etalon 2 reference beam in WLM SchemeTable Location of this data set in scheme used to control data acquisition Picarro G2307 Analyzer User Manual...
  • Page 103 Mole fraction of methane from peak absorption only, without water correction or instrument-specific calibration dm_latency Interval between successive calls to seconds the data manager script fittime Time spent in the fit script for the seconds methane spectrum goodLCT Picarro G2307 Analyzer User Manual...
  • Page 104 Peak absorption of the methane line ppb/cm from Levenberg-Marquardt fit peak80 Peak absorption of the formaldehyde ppb/cm line from Levenberg-Marquardt fit pzt2_adjust pzt2_offset pzt_mean pzt_per_fsr pzt_stdev residuals residual of the fit to the spectrum ppb/cm solenoid_valves Picarro G2307 Analyzer User Manual...
  • Page 105 Galatry function for the formaldehyde line from Levenberg-Marquardt fit timestamp Unix time stamp for this spectrum milliseconds tiptop tuner_mean tuner_stdev wlm2_offset Collisional broadening parameter for dimensionless number the water line Collisional broadening parameter for dimensionless number the methane line Picarro G2307 Analyzer User Manual...

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