LI-COR LI7200RS Instruction Manual
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LI-COR LI7200RS Instruction Manual

Enclosed co2/h2o gas analyzer
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Enclosed CO2/H2O
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Summary of Contents for LI-COR LI7200RS

  • Page 1 Enclosed CO2/H2O Gas Analyzer Instruction Manual...
  • Page 3 Regional Offices LI-COR Biosciences GmbH Siemensstraße 25A 61352 Bad Homburg Germany Phone: +49 (0) 6172 17 17 771 envsales-gmbh@licor.com LI-COR Biosciences UK Ltd. St. John’s Innovation Centre Cowley Road Cambridge CB4 0WS United Kingdom Phone: +44 (0) 1223 422102 envsales-UK@licor.com LI-COR Distributor Network: www.licor.com/env/distributors...
  • Page 4 LI-COR MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. LI-COR shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.
  • Page 5 CE Marking: This product is a CE-marked product. For conformity information, contact LI-COR Support at envsupport@licor.com. Outside of the U.S., contact your local sales office or distributor. LI-7200RS CO2 / H2O LI-7200RS Closed Path CO O Analyzer Part Name Toxic and Hazardous Substances or Elements...

  • Page 6: A Bit Of History

    LI-7200. We invite you to install the new soft- ware on older instruments. It is available for free from the LI-COR web site. We also invite your feedback—what do you like? What do you dislike? What do you...

  • Page 7: Table Of Contents

    Contents A bit of history... Section 1. General Information What’s What Spare Parts Kits Cables Calibration Certificate The SmartFlux® 2 System LI-7550 Analyzer Interface Unit Section 2. Initial Setup First Things First Installing the Gas Analyzer and Components Mounting the LI-7550 Analyzer Interface Unit Using the Insulated Intake Tube Using the Heated Intake Tube Intake Tube Dimensions...
  • Page 8 Connect over Serial RS-232 Run Disconnected Dashboard Instrument Information and Logging Instrument Status and Connectivity Eddy Covariance Flux Graphs 3-10 Data Display 3-13 Configuring Eddy Covariance Measurements 3-16 Eddy Covariance Checklist 3-16 System Clock 3-19 Configuring the USB Log File 3-20 Entering the Site Description 3-21...
  • Page 9 Eddy Covariance Site Maintenance Schedule Cleaning the Optical Path Opening the Optical Bench Replacing the Internal Chemicals Cleaning the Intake Cap and Screen Maintaining the Filter Replacing the Fuses Power Supply Fuse Accessory Fuse Replacing the Thermocouples Leak Test 5-11 Software Updates for Gas Analyzers 5-11 Embedded Instrument Software...
  • Page 10 Ethernet Output 7-14 DAC Configuration 7-15 SDM Output 7-16 Delay Time 7-18 Total System Delay Examples 7-19 Bandwidth 7-19 Diagnostic Value 7-20 Calibration Window Overview 7-21 Signal Strength Tab 7-22 Coefficients Tab 7-22 Manual Tab 7-23 History Tab 7-24 Changing Sensor Heads 7-24 By Hand 7-24...
  • Page 11 Appendix C. Suppliers Appendix D. Configuration Grammar Appendix E. Warranty Appendix F. Index...

  • Page 13: Section 1. General Information

    Section 1. General Information The LI-7200/RS is a closed path, non-dispersive infrared CO O analyzer designed for use in eddy covariance flux systems. Some of the LI-7200/RS's import- ant features include: Onboard computation of flux data in the SmartFlux 2 System, which is included as a standard component.

  • Page 14: What's What

    You need the PC software to configure the instrument. Download it from Note: the LI-COR technical support web site: www.licor.com/env/support. Select your instrument and you'll find the software downloads. Spare Parts Kits The LI-7200/RS sensor head spare parts kit (part 7200-028) includes accessories and replacement parts for the sensor head.

  • Page 15: Cables

    Section 1. General Information Description Qty. Part Number Insulated Intake Tube (1 m) 9972-053 Intake Cap Assembly 9972-072 Swagelok 2-micron Dust Filter 9972-073 Hex Key (7/64") 610-03745 LI-7550 Analyzer Interface Unit Spares Kit 9975-023 Control Unit Mounting Kit 9979-022 RS-232 Cable 392-10268 Power Cable 9975-030...
  • Page 16 RS-232 has a standard DB-9 female connector for direct connection to a computer. Most modern computers will require an RS-232-to-USB adapter to use this cable. LI-COR provides an RS-232-to-USB adapter (part 6400-27) that has been tested to work with all LI-COR devices.

  • Page 17: Calibration Certificate

    LI-7550 at the factory. Keep this sheet in case you need to re-enter these values. You can also acquire a copy of your calibration certificate from the LI-COR support web site. The SmartFlux® 2 System The SmartFlux 2 System comes standard with your analyzer.

  • Page 18: Li-7550 Analyzer Interface Unit

    Section 1. General Information LI-7550 Analyzer Interface Unit The LI-7550 Analyzer Interface Unit houses the gas analyzer electronics and a con- nector for the USB flash drive. A 16 GB industrial-rated drive is included with the instrument. There are three Ethernet connectors inside the LI-7550, two of which are connected to the external ports.
  • Page 19 Section 1. General Information Figure 1-3. LI-7550 connector panel. Figure 1-4. Pin assignments and wire colors for Power, SDM, Auxiliary Input and DAC Output cables. The lower left section describes blink patterns given by the USB indicator LEDs. LI-7550 Analyzer Interface Unit...
  • Page 20 Section 1. General Information LI-7200RS Enclosed CO₂/H₂O Analyzer...

  • Page 21: Section 2. Initial Setup

    Section 2. Initial Setup This section describes how to mount the analyzer and accessories in a typical eddy covariance application. First Things First The following section covers the basic steps you will follow to set up the LI-7200RS. Many of these steps are described in greater detail elsewhere in this manual.
  • Page 22 Section 2. Initial Setup Connect the Flow Module The 7200-101 Flow Module draws sample air through the LI-7200/RS sensor head. Remove the Swagelok fit- ting from the port of the head and replace it with the 3/8" plastic hose barb from the spares kit.
  • Page 23 Go to www.licor.com/env/support, select your instrument and then select Software. Download the software and install it on your computer. The program icon will be in the Programs menu under the LI-COR folder. Connect to the Instrument Launch the PC software, then select your instrument from the list and click...

  • Page 24: Installing The Gas Analyzer And Components

    Section 2. Initial Setup Installing the Gas Analyzer and Components The instrument is typically installed on a tripod or tower for eddy covariance applic- ations. This section describes how to install the instrument and its associated com- ponents. Mounting the LI-7550 Analyzer Interface Unit The mounting kit (part number 9979-022) is used to mount the LI-7550 to a tripod or other post.

  • Page 25: Using The Insulated Intake Tube

    Section 2. Initial Setup Table 2-1. Mounting kit parts. (...continued) Item Qty. Part Number Description 235-13234 Single Bolt Flared Leg Mounting Bracket 300-13293 Hose Clamp, 9/16” 9879-045 Mounting Plate included w/ item #4 5/16-24 × 1/2” Hex Head Bolt included w/ item #4 5/16”...

  • Page 26: Using The Heated Intake Tube

    Section 2. Initial Setup Using the Heated Intake Tube The heated intake tube is an accessory for the LI-7200/RS gas analyzers. It warms the intake tube to prevent condensation in the tube and improve the frequency response of water vapor measurements, especially in humid environments. The heated intake tube can be installed on any LI-7200/RS.
  • Page 27 Section 2. Initial Setup Installing the Heated Intake Tube All LI-7200/RS instruments need the accessory junction splitter to be installed on the LI-7550, so install it on the accessory connector. Early heated intake tubes have a T-shaped splitter (392-10502); later models have a splitter cable (392-17153). Install the splitter provided with your intake tube.
  • Page 28 Section 2. Initial Setup Early instruments are equipped with a 3/8" inlet fitting. It should be replaced with the ¼" fitting before installing the tube. Remove the old intake tube (if installed). Install the particulate filter (optional). Air should flow in the direction indicated on the filter. Install the tube in the analyzer head.

  • Page 29: Intake Tube Dimensions

    Section 2. Initial Setup It connects to the accessory junction splitter. Secure the cables so that cable junctions are not bearing their weight. Note: The heated intake tube is not flexible. Do not bend it. Intake Tube Dimensions Determine the total length of intake tube used in your system. Insulated Intake Tube Specifications on page A-5 shows the total length of the insulated intake tube.

  • Page 30: Installing The Intake Cap

    Section 2. Initial Setup Remove the intake cap. Carefully observe the flow arrow indicator on the filter. Air should flow in the dir- ection of the arrow. Remove the compression fitting from the intake side of the filter. Install the nut, front ferrule, and back ferrule over the short stainless steel pipe. Be sure the tube is fully seated in the filter.
  • Page 31 Section 2. Initial Setup If necessary, remove the old cap and all of its components from the intake tube. Place one hose clamp over the intake tube and slide the new intake cap over the stainless steel intake tube until it stops. The intake tube should extend ~1 inch (2.54 cm) into the cap.

  • Page 32: Mounting The Sensor Head And Intake Tube

    Section 2. Initial Setup Mounting the Sensor Head and Intake Tube The LI-7200/RS sensor head should be mounted to a tripod or tower using the mounting kit (part number 7900-340) or a ¾ inch IPS NuRail® swivel mount. The head should be tilted at a 10 to 15° angle toward the inlet. If the intake tube is longer than 15 cm, it should be attached to a secure element so that the analyzer is not bearing its full weight.
  • Page 33 Section 2. Initial Setup Figure 2-5. High above the plant canopy top (1.5 m or higher), mount the intake under the sonic path to minimize the horizontal sensor separation and wind flow disturbance. Figure 2-6. Close to the plant canopy top, mount the intake alongside the sonic path to minimize the vertical sensor separation.
  • Page 34 Section 2. Initial Setup Important: Do not insert the intake into the anemometer path, because sig- nificant flow disturbance to all three wind components may occur, severely affect- ing flux data quality. Or worse, the intake could completely block the transducers.

  • Page 35: Connecting The Sensor Head Cable

    Section 2. Initial Setup Connecting the Sensor Head Cable It is important that the head cable be connected properly to the sensor head. Follow these guidelines: There is a gasket in the head cable connector that should be compressed when the cable is connected.

  • Page 36: Tips For Success

    Filtering In situations where fine-particle filtering is required to maintain acceptable data quality a restrictive single-micron filter can be used (LI-COR part number 9967- 008). The 7200-101 Flow Module was designed specifically for low-power operation, and cannot be used with such filters. In these installations, an external pump will be required.

  • Page 37: Operation In Cold Weather (<5 °C)

    Section 2. Initial Setup problem through alternative mounting attachments. When using an intake tube longer than 50 cm, we recommend that you secure the tube to avoid excessive vibra- tion and torque, as shown in Figure 2-4 on page 2-12. Operation in Cold Weather (<5 °C) The instrument has a temperature setting that reduces the dissipation of heat in cold weather.
  • Page 38 Section 2. Initial Setup Place the desiccant bottle upright in the LI-7550, then close and latch the door. To help ensure that the desiccant does not become saturated, open the LI-7550 door only when needed. Opening the door allows humid air into the LI-7550, which depletes the desiccant.

  • Page 39: Using The 7550-101 Auxiliary Sensor Interface

    Section 2. Initial Setup Using the 7550-101 Auxiliary Sensor Interface The optional Auxiliary Sensor Interface (ASI) is an O-ring sealed, weatherproof junction box that can be used to connect analog inputs and/or outputs. It has con- nections for up to six analog outputs, four general purpose analog inputs, and a con- PLUGS PLUGS...

  • Page 40: Terminal Connections

    Section 2. Initial Setup Terminal Connections Terminal positions for are: analog inputs Terminal Analog Inputs Description AUX1+ Auxiliary Input 1 positive AUX1- Auxiliary Input 1 negative Ground AUX2+ Auxiliary Input 2 positive AUX2- Auxiliary Input 2 negative Ground AUX3+ Auxiliary Input 3 positive AUX3- Auxiliary Input 3 negative AUX4+...

  • Page 41: Electrical Connections

    Section 2. Initial Setup Electrical Connections All analog devices connected to the ASI must be referenced to the ground (GND) connection; some examples are shown below. All auxiliary analog input ground connections are internally connected together. All auxiliary analog output ground connections are internally connected together.
  • Page 42 Section 2. Initial Setup Remove the Philips screws from the corners of the ASI and remove the top cover. Remove the cap from a gland plug. Pass the wires through the cap and then through the gland plug. Insert the wire leads into the appropriate terminals. Tighten the terminals to secure the wires. Make a note of which plug the wires are passing through (e.g., A, B, C), and to which terminals the wires are connected.

  • Page 43: Section 3. Operation

    Go to www.licor.com/env/support, select your instrument and then select Software. Download the software and install it on your computer. The program icon will be in the Programs menu in the LI-COR folder. Connecting with the Analyzer Launch the software to open the window.
  • Page 44 Section 3. Operation Figure 3-2. Option 2: Connect to the Ethernet port on the exterior of the LI-7550 enclosure. Plug the other end (RJ45 connector) directly into a computer or computer network. If the instrument is powered on and connected to an Ethernet port on the same subnet as your computer, its name will be displayed in the software.

  • Page 45: Connect Over Serial

    Section 3. Operation is the communication frequency between the instrument and the Update Rate computer. Select from 0.1, 0.2, 0.5, 1, 2, 5, 10, or 20 Hz. Note: When connecting over satellite or cellular networks that have data limits, connect at a lower update rate (such as 0.1 Hz) to limit the amount of data used. Click on the button to establish communications with the instrument.

  • Page 46: Run Disconnected

    Section 3. Operation Select the communication baud rate for the serial port. The maximum update rate is dependent upon the rate available with your computer's serial port and the used while the program Update Rate communicates with the instrument. Select from 9600, 19200, 38400, 57600, or 115200.
  • Page 47 Section 3. Operation The PC software can be used independently of an instrument by clicking on the tab and selecting the instrument. This can be useful for training Run Disconnected purposes, or for creating a configuration file that can then be saved and transferred to instruments in the field.

  • Page 48: Dashboard

    SmartFlux System (computes fluxes on-site in real time) .ghg files, which are logged by the LI-COR eddy covariance systems, are self-contained eddy covariance files that can be processed by EddyPro in the SmartFlux System to provide fully corrected flux results.

  • Page 49: Instrument Information And Logging

    Section 3. Operation Instrument Information and Logging Information about the CO O gas analyzer is presented in this pane. Indicates the network name of the gas analyzer. Connected to: Serial number of the CO O analyzer sensor head. Head serial number: Indicates the model of the CO O analyzer.

  • Page 50: Instrument Status And Connectivity

    Section 3. Operation Instrument Status and Connectivity Instrument status information is presented in the status pane Note: The warning symbol ( ) indicates that the component is in need of atten- tion or that it is not communicating properly. Indicates the status of the CO O gas analyzer.
  • Page 51 Section 3. Operation SmartFlux Indicates the status of the SmartFlux or SmartFlux System. None: SmartFlux or SmartFlux System not connected. Serial Number of SmartFlux or SmartFlux System: Connected. Note: A warning symbol ( ) indicates "waiting to connect" or that the system has become disconnected.

  • Page 52: Eddy Covariance Flux Graphs

    Section 3. Operation Eddy Covariance Flux Graphs Click on one of the three tabs on the left side of the graphing pane. The Real Time tab provides real-time graphing of measured variables. The tab displays eddy Results covariance flux results from the SmartFlux System. The tab displays a graph Wind of wind speeds by direction.
  • Page 53 Section 3. Operation Flux (µmol/m /s; LI-7700 required), u* (m/s), (µmol/mol), O (mmol/mol), (µmol/mol; LI-7700 required). If the SmartFlux or SmartFlux System is properly configured, this Wind speed: tab presents mean wind speed by direction. sets how many days of data Duration are displayed.
  • Page 54 Section 3. Operation 3-12 LI-7200RS Enclosed CO₂/H₂O Analyzer...

  • Page 55: Data Display

    Section 3. Operation Data Display To change the variable(s) displayed in the data windows, click on the data value; a pop-up window appears, from which you can select the variable you Data Items want to display. The variables available for display are given in Table 3-1 below. Table 3-1.
  • Page 56 Section 3. Operation Table 3-1. Variables available for display and logging to the USB drive. (...continued) Variable Description CO2 dry (µmol/mol) See note below H2O (mmol/m O concentration density H2O (g/m O mass density H2O Absorptance O raw absorptance value H2O (mmol/mol) O mole fraction H2O dry (mmol/mol)
  • Page 57 Section 3. Operation Table 3-1. Variables available for display and logging to the USB drive. (...continued) Variable Description 7550 Auxiliary Input 4 Auxiliary input 4 value Flow Rate (slpm) 7200-101 flow rate in mass flow units of Standard Liters Per Minute (SLPM) Flow Rate (lpm) 7200-101 volumetric flow rate corrected for temperature and pressure...

  • Page 58: Configuring Eddy Covariance Measurements

    Section 3. Operation Table 3-1. Variables available for display and logging to the USB drive. (...continued) Variable Description Vertical wind speed (m/s) as measured up the mounting shaft, SmartFlux System required Sonic temperature, SmartFlux System required Speed of sound, SmartFlux System required AnemDiag Diagnostic value output by the anemometer, SmartFlux System required...
  • Page 59 Section 3. Operation Note: Some of the settings in the table below are required in order to log valid eddy covariance datasets. Table 3-2. Checklist of mandatory and recommended EC system settings. Software Field Recommended Setting See Section Settings > Time Clock Sync (PTP): Automatic System Clock on...
  • Page 60 Section 3. Operation Table 3-2. Checklist of mandatory and recommended EC system settings. (...continued) Software Field Recommended Setting See Section Anemometer > Analog (Analog inputs only; if the anemometer is Entering Input Settings connected to the LI-7550) Anemometer Information on page 3-22 Site Setup >...

  • Page 61: System Clock

    Section 3. Operation System Clock Click . Under the tab, set and the Settings Time Clock sync (PTP) Automatic time/location will be updated when the data is received from satellites. When using PTP, the Date and Time fields are populated automatically. PTP will override any settings you enter in those fields.

  • Page 62: Configuring The Usb Log File

    Section 3. Operation may need to change the setting. See Advanced—Chopper Housing Temperature on page 7-8 for more details. The remaining tabs in the window can be Site Setup skipped or used for advanced configurations. Configuring the USB Log File Click to configure datalogging.

  • Page 63: Entering The Site Description

    Section 3. Operation Note: We suggest setting the CO O analyzer bandwidth at 1/2 of the logging update rate. Thus, if you are sampling at 10 Hz, the bandwidth should be set to 5 Hz. 5 Hz is the default setting for bandwidth. Entering the Site Description tab is used to enter information about the site.

  • Page 64: Entering Anemometer Information

    Section 3. Operation In the logarithmic wind profile, the roughness length is the Roughness length: height at which wind speed is zero (indicated by z ). It provides an estimate of the average roughness elements of the surface. With vegetated surfaces, because the vegetation itself provides a certain roughness, the logarithmic wind profile goes to zero at a height equal to the displacement height plus the roughness length.
  • Page 65 LI-7550 Analyzer Interface Unit. Anemometer Settings Choose the sonic anemometer manufacturer and model in the Manufacturer: menus. LI-COR supports the following sonic anemometer models: Anemometers for use with SmartFlux 2 Manufacturer Model(s) Campbell® Scientific...
  • Page 66 Section 3. Operation Anemometers for use with SmartFlux 2 Manufacturer Model(s) Gill Instruments WindMaster, WindMaster Pro, HS-50, R3-50, or R3-100 Metek Class-A Multipath, Cage Multipath RM Young 81000V, 8100VE, 8100RVE Anemometers for use with LI-7550 Analog Inputs Only Manufacturer Model(s) Gill Instruments HS-100™, R2 R3-50™, R3-100™...
  • Page 67 Section 3. Operation Important: EddyPro requires the offset with respect to geographic north as two pieces of information: The offset with respect to geographic north and the mag- netic declination. Currently the software does not provide an entry for magnetic declination.
  • Page 68 Section 3. Operation Choose the Type Input field allows you to choose from: Type U – Horizontal wind speed (m/s) as measured toward the direction in line with the north spar (see diagram below) V – Horizontal wind speed (m/s) as measured toward the direction of 90° coun- terclockwise from the north spar W –...
  • Page 69 Section 3. Operation Type Units Other Other, m/s, cm/s, volts, K, and C m/s, cm/s, volts m/s, cm/s, volts m/s, cm/s, volts K, C, volts m/s, cm/s, volts Enter the Label The Label will appear in the file header in both the data and/or metadata files. The label cannot be changed for any of U, V, W, T , or SOS.
  • Page 70 Section 3. Operation values in units of m/s. What is the wind speed when the sonic anemometer outputs a raw voltage value of 0.5 V? Set the field to U. Set the field to m/s. The is set automatically. Type Units Label Enter 12 for the Multiplier (m) and -30 for the Offset (b).

  • Page 71: Entering Co2/H2O Analyzer Information

    Section 3. Operation Entering CO O Analyzer Information The CO O Analyzer tab shows the type of CO O analyzer. Here you select the values to log to the USB drive and enter the gas analyzer position relative to the sonic anemometer.
  • Page 72 Section 3. Operation Figure 3-3. Eastward and northward separation of the gas analyzer relative to the sonic anemometer. Northward Separation (cm) (mandatory): North or south distance between the LI- 7500A/RS sample path or LI-7200/RS inlet and the anemometer. Positive values if north and negative values if south of the anemometer.

  • Page 73: Configuring The Flow Module

    Section 3. Operation Configuring the Flow Module The 7200-101 Flow Module is configured through the LI-7200 Windows software from . See the 7200-101 Instruction Manual for more LI-7200 > Flow Module information. The window displays the following variables: Measured flow (SLPM): Standard Liters per Minute, mass flow. Measured flow (LPM): Liters per Minute;...

  • Page 74: Entering The Intake Tube Dimensions

    Section 3. Operation Entering the Intake Tube Dimensions In the gas analyzer software, under , enter the dimensions of the intake Site Setup tube. LI-7200/RS intake tube length, in centimeters. Tube length (cm) (mandatory): LI-7200/RS intake tube inside diameter, in mil- Tube diameter (mm) (mandatory): limeters.

  • Page 75: Configure The Heated Intake Tube

    Section 3. Operation Configure the Heated Intake Tube If you are using the Heated Intake Tube, configure the power setpoint. Click the LI-7200/RS menu and select and set the power setpoint. Intake Tube... Indicates whether the heated intake tube is detected [OK, Unknown, or Status: None].

  • Page 76: Connect With An Li-7700

    Section 3. Operation Connect with an LI-7700 Click on the button in the dialog box or the LI-7700 but- Site Setup > LI-7700 ton in the dashboard to connect to an LI-7700 CH analyzer. The LI-7700 tab displays a list of LI-7700 instruments available on the network (same subnet as computer).

  • Page 77: Select Variables

    Section 3. Operation North/south distance between the LI-7700 Northward Separation (cm) (mandatory): Analyzer and the reference anemometer. Positive values if north and negative val- ues if south of the anemometer. East/west distance between the LI-7700 Ana- Eastward Separation (cm) (mandatory): lyzer and the reference anemometer.

  • Page 78: Entering Biomet System Information

    Diagnostic value, an integer Entering Biomet System Information A properly configured LI-COR Data Acquisition System or Biomet system (Sutron 9210 datalogger) can be connected to the to the eddy covariance system. Biomet data are logged in the dataset collected by the CO O analyzer.
  • Page 79 Section 3. Operation Select this option for either a LI- Data Acquisition System (DAqM) and Sutron 9210: COR Data Acquisition System or a Biomet System with a Sutron 9210 logger. For the Data Acquisition System, check the button and click OK. For the Sutron, select a Sutron 9210 from the list or enter an IP address in the Datalogger IP Address field (networked device on different subnet mask as computer) and click...

  • Page 80: Connecting With The Smartflux Or Smartflux 2 System

    Sync clock to 7550 Site Setup > Biomet the datalogger and LI-7550 clocks. Refer to the LI-COR Data Acquisition Sytem or the Biomet System (Sutron) instruc- tion manuals for more information. Connecting with the SmartFlux or SmartFlux 2 System The SmartFlux window in the Windows software displays a list of all SmartFlux 2 Systems that are connected to your network of sensors.
  • Page 81 Section 3. Operation EddyPro Processing Options Two processing settings are available in the tab: EddyPro Express Mode Advanced Mode Express settings are used by default. To use Express mode, simply connect with the SmartFlux System or SmartFlux 2 System. Select to activ- Use Express Mode ate the setting.
  • Page 82 Section 3. Operation Connect to FluxSuite The FluxSuite tab is where you connect your eddy covariance station to FluxSuite Software. To connect to FluxSuite, you'll need to register on FluxSuite (app1.fluxsuite.com) and create a station key. Enter the key in this tab and set the update rate.
  • Page 83 Section 3. Operation The options available include: Check this box to enable transfer. Transfer data to a remote repository: Here you enter the Server URL and login credentials. In the Data Server: Server field, you have some options that enable you to specify which data should be URL: transferred.
  • Page 84 Section 3. Operation In the examples above, the server-address is the URL of the server where SmartFlux will transfer data. Depending on how the server is set up, the path may or may not be needed. SmartFlux 2 expects the server to ask for a username and password, so they are man- datory fields.
  • Page 85 Section 3. Operation Connect to an LI-8100A Soil Gas Flux System If you are connecting an LI-8100A to FluxSuite, you do so through this tab. You need to enter the LI-8100A IP address in the field labeled . Click Hostname Apply after entering the 8100 Settings...

  • Page 86: Begin Logging Data

    Section 3. Operation Begin Logging Data Note: Your current instrument configuration can be saved for later use. Click and select . Select the items in the Save Options Config Files Save Configuration dialog that you want to store in the configuration file, and click Continue , and buttons are located on the main dashboard and on each tab...

  • Page 87: About Data Files

    Section 3. Operation About Data Files Eddy covariance data files (.ghg extension) are ASCII text files with a header and tab-delimited rows of data. When paired with the metadata file, the data file header is ignored by EddyPro, which uses the metadata file to interpret the data columns and to retrieve the appropriate meta-information needed to calculate fluxes.

  • Page 88: Transferring Logged Data

    Section 3. Operation If you log all variables at 10 Hz (10 samples per second), approximately 180 MB of data will be generated each day. Thus, the 16 GB drive can collect about 80 days of data with no compression. With compression, a daily file would be about 50 MB; the 16 GB drive can collect about 288 days of data.
  • Page 89 Section 3. Operation set the port if you are connecting with a cellular or satellite gateway. If your instru- ment is not listed, type the IP address into the field. IP Address displays the size of the USB drive, available memory, num- USB Drive Information ber of each type of file.

  • Page 90: Eddypro Processing Modes On The Smartflux System

    Section 3. Operation After configuring the transfer and selecting files, click Start You can also use third-party file transfer (SFTP) applications to transfer data, such as WinSCP. In this case, connect using the instrument IP address and the fol- lowing settings: Port: if you have forwarded port 22 to port 2200.
  • Page 91 Section 3. Operation This—and subsequent versions of EddyPro—provide the capability to export a SmartFlux configuration file, that can then be uploaded via the gas analyzer PC soft- ware. Complete documentation is provided in the EddyPro help. There are additional considerations if you use in the SmartFlux EddyPro Advanced or SmartFlux 2 System.
  • Page 92 Section 3. Operation To use this mode, check the box, and proceed through EddyPro as you normally would. The steps are summarized below: Click the box on the EddyPro opening screen. SmartFlux Configuration Select New Project Open Project If you are creating a and you do not intend to use planar-fit, automatic New Project time-lag optimizations, or in situ spectral corrections:...
  • Page 93 Section 3. Operation Configure Advanced Settings (see Advanced Processing on page 3-48). If you are using , automatic , or planar-fit time-lag optimization in situ spectral cor- (see Using Planar Fit, In situ Spectral Corrections and Timelag Optimization in rections SmartFlux or SmartFlux 2 below for details): Select a planar-fit file that was generated by EddyPro using data from your site.
  • Page 94 Section 3. Operation For example, you can use three months of data to calculate a spectral assessment, and then use this spectral assessment that is summarized in a short text file, to cor- rect fluxes calculated from data collected after those three months, if the system con- figuration didn’t change to such an extent that the spectral assessment is no longer representative.
  • Page 95 This is because inside SmartFlux, EddyPro does not need any of the information that is entered in the Project Creation page. The file type (LI-COR .ghg), the use of metadata (“embedded”) and the use of biomet data (“embedded”) are all predefined settings in the SmartFlux or SmartFlux 2 System.
  • Page 96 30 minutes. In the SmartFlux or SmartFlux 2 System there is no option to calculate fluxes on any other time interval. is deactivated because LI-COR eddy covariance systems are Master Anemometer designed around one only anemometer, which is detected automatically in the SmartFlux or SmartFlux 2 System as the “master”.
  • Page 97 Section 3. Operation , which activates when the Time lag Optimization Settings... Automatic time lag option is chosen as a method, only gives the optimization Time lag compensation Time option. If you want to use the automatic timelag optimization option in the lag file available SmartFlux or SmartFlux 2 System, you will have to load a previously created timelag optim- ization file at this time.
  • Page 98 Section 3. Operation , all processing options are active, and you can Advanced Settings > Statistical Analysis select them as you would do in EddyPro with no exceptions. , most options are active, with the following exceptions: Advanced Settings > Output Files pre-selection buttons are deactivated, Set Minimal Set Typical...

  • Page 99: Smartflux Results Files

    Section 3. Operation Browse to the file created in EddyPro (extension *.smartflux) and select it. After loading the file, the SmartFlux System or SmartFlux 2 System will compute flux results based upon the defined Advanced settings. Be sure to turn on data- logging first.
  • Page 100 Section 3. Operation Data Backup An emergency data backup archive is stored on the internal memory of the SmartFlux 2 System, which may be useful if data are lost for any reason. The backup files are limited to the latest files recorded—the oldest files are overwritten when the internal memory gets full.

  • Page 101: Section 4. User Calibration

    Section 4. User Calibration The LI-7200RS’s measurement accuracy depends upon its calibration. There are two major components to the calibration: 1) determining the values of calibration coefficients, and 2) setting zero and span. During a factory calibration, both of these steps are performed.

  • Page 102: Checking The Zero

    O, when there are large temperature changes. Note: Read the technical note called "Using CO and H O Scrubbers with LI-COR Gas Analyzers" for information about the interactions between scrub chemicals and the air. See https://www.licor.com/documents/7i418s3uhd2uamoxfmjd. Checking the Zero Flow a dry CO -free air through the optical path and check the analyzer reading in the software dashboard.

  • Page 103: Checking The Span

    For the water vapor span, a convenient standard to use is a dew point generator such as the LI-COR LI-610. To avoid condensation problems choose a dew point temperature that is about 3 to 5 °C below the ambient temperature. Also, since water vapor sorbs and desorbs from surfaces, allow plenty of time for the reading to stabilize.
  • Page 104 Section 4. User Calibration LI-610 To Air In Dew Point Generator Note: In general, if reliable calibration standards are not available or if there is not enough time to do the job properly, it is better to leave the zero and span set- tings alone than to rush through the procedure and make incorrect settings.
  • Page 105 Section 4. User Calibration Step-by-Step Calibration Instructions Clean the optical cell and reassemble it (see Cleaning the Optical Path on page 5-3). Disconnect the intake tube at the air inlet on the sensor head. Connect the calibration gas to the air inlet fitting using 3/8”...
  • Page 106 Section 4. User Calibration Zero CO IMPORTANT: Always zero the instrument before spanning (don’t span, then zero). In the PC software, click under the LI-7200 button. Calibration Verify that temperature and pressure sensors are working properly by checking their values in the dashboard. Click on the tab and view the value of Z Zero).

  • Page 107: Zero H2O

    Section 4. User Calibration Zero H Now is a good time to check and set the H O zero, if needed. Click the tab, and note the present value of Z O Zero). Manual Wait for the H O reading to stabilize in the dashboard (3 or 4 minutes). The flag will turn from a red ‘X’...

  • Page 108: Secondary Co2 Span

    Section 4. User Calibration Considerations for Setting the Secondary Span If you find that after zeroing then spanning at one concentration, the instrument is not within specifications at a different concentration, a secondary span may be in order. The most common reason for doing this would be after a change in the chopper housing temperature set point.

  • Page 109: Secondary H2O Span

    Section 4. User Calibration Secondary H O Span Zero the H O reading (see Zero H2O on page 4-7). Span the H O reading at a dew point that is just below the ambient temperature (see Span H2O on page 4-7). Flow a very low dew point through the tubing. Click on the Span 2 tab, and when stable, click Span 2 H It may take another 10 minutes or so to...
  • Page 110 Section 4. User Calibration When the span is set, the value of S (or S for water) is determined. For density ρ'c in the optical path and the measured example, if there is a known CO absorptance is α ’c, then from equations 8-19 and 8-8, we can write We rewrite this in terms of a known mole fraction C’...
  • Page 111 Section 4. User Calibration A new offset term S is then computed using equation 4-5, since the slope term has changed. Similarly, for H O, each time a normal water span is set, the instrument retains and when a secondary H O span is performed at water mole fraction W’...
  • Page 112 Section 4. User Calibration 4-12 LI-7200RS Enclosed CO₂/H₂O Analyzer...

  • Page 113: Section 5. Maintenance

    Section 5. Maintenance The section describes maintenance procedures. A good maintenance plan will ensure good performance of the instrument, reduce data gaps, and give you greater confidence that the measurements truthfully represent physical processes. FluxSuite Software can help immensely with your maintenance plan. Eddy Covariance Site Maintenance Schedule When you first deploy the instrument: Check the flow drive percent and record it.
  • Page 114 Replace the head chemicals. Clean or replace any air filters. Every two years: Check the instrument calibration with one or more span gases. If it is outside the specifications, return the instrument to LI-COR for recalibration. LI-7200RS Enclosed CO₂/H₂O Analyzer...

  • Page 115: Cleaning The Optical Path

    Section 5. Maintenance Cleaning the Optical Path Important: Power off the gas analyzer (disable the power supply or disconnect the power cable from the LI-7550) before conducting any maintenance that involves disassembly or disconnecting cables. Disassembling the instrument or detaching or attaching head cables while the instrument is powered on may dam- age the instrument or result in a loss of data.

  • Page 116: Replacing The Internal Chemicals

    CO and water vapor. They bottles should be recharged with fresh chemicals annually (or every 6 months in hot, humid cli- mates). Replacement "charged" bottles are available from LI-COR in sets of three LI-7200RS Enclosed CO₂/H₂O Analyzer...
  • Page 117 Section 5. Maintenance under part number 7200-950. If you want to recharge the bottles yourself, see Sup- pliers on page C-1, for a list of suppliers of Ascarite II and magnesium perchlorate. NOTE: Calibration shifts will occur if CO or H O are not kept out of the ana- lyzer housings.
  • Page 118 Section 5. Maintenance Figure 5-3. Insert the recharged bottles cap first. Make sure the caps have holes in the top. Use the retention screw to remove the bottle cover on the upper sensor head housing and insert the new, recharged bottle, cap first. Figure 5-4.

  • Page 119: Cleaning The Intake Cap And Screen

    Section 5. Maintenance Note: Read the technical note called "Using CO and H O Scrubbers with LI-COR Gas Analyzers" for information about the interactions between scrub chemicals and the air. See https://www.licor.com/documents/7i418s3uhd2uamoxfmjd. Cleaning the Intake Cap and Screen To clean the cap and screen, remove the intake cap assembly and back-flush it with compressed air or water.

  • Page 120: Replacing The Fuses

    Section 5. Maintenance Clean the filter before the Flow Drive (%) exceeds 90%. Cleaning: If possible, use an ultrasonic water bath, then back-flush the filter with compressed air and allow the filter to dry before reinstalling. Otherwise, immerse the filter in boiling water for a few minutes or soak it over night and then back- flush it with compressed air.

  • Page 121: Power Supply Fuse

    Section 5. Maintenance Power Supply Fuse The power supply is protected by a 5 A 125/250V, 5 × 20 mm fast-blow fuse (part number 439-04214). If the battery or other power source fails to power the instru- ment, check to see if the fuse has blown. The fuse is located in the lower left-hand corner, as shown in Figure 5-5 on the pre- vious page.
  • Page 122 Section 5. Maintenance Separate the optical path from the inlet/outlet assembly, being careflu not to strain the tubing that connects the two. Remove the small thermocouple circuit boards. The entire assembly, including the circuit board, is replaced as a unit (Figure 5-6 below).

  • Page 123: Leak Test

    Windows interface software. Check the installed version of the embedded analyzer software by clicking the Diagnostics tab at the top of the GHG Windows Interface software. You can view the latest version numbers and acquire the software from the LI-COR web site: www.licor.com/env/support. Leak Test...

  • Page 124: Embedded Instrument Software

    Section 5. Maintenance On the support web site, select your instrument, then select "Software." Download both the and the Instrument (Embedded) Software Windows Interface Software Embedded Instrument Software To update the embedded instrument software: Make sure your gas analyzer sensor head is connected to the LI-7550 Analyzer Interface Unit. Power up the gas analyzer.
  • Page 125 Section 5. Maintenance Select the gas analyzer from the list and click Update Software The update will take about 5 minutes. Important: Do not close the software, let your PC go to sleep, or power off the instrument during the update process. The software will notify you when the update is complete. If the update fails for any reason, repeat steps 2 and 3.

  • Page 126: Windows Software Update

    Section 5. Maintenance Windows Software Update To update the Windows interface software for gas analyzers: The Windows interface software is an executable file named something similar to LI-7xxx_win- . Double click to launch the installer. Follow the Windows Installation wizard to install the application. 5-14 LI-7200RS Enclosed CO₂/H₂O Analyzer...

  • Page 127: Flow Module Maintenance

    The fuse in the 7200-101 case can blow if power is applied with reverse polarity. Open the instrument case and unscrew the fuse cover to replace the fuse. The replacement fuse is a 5 A fast-blow, 125 V, 5x20 mm type, available from LI-COR under part number 439-04214.
  • Page 128 Section 5. Maintenance Figure 5-8. Remove the cap on the filter and clean the screen with water or compressed air. Figure 5-9. Plot of pressure drop (kPa) vs. blower drive in 7200-101. During normal oper- ation, the 7200-101 pressure drop is about 1.0 kPa. Typical maximum is about 4.5 kPa at 100% motor drive.
  • Page 129 Section 5. Maintenance Figure 5-10. Plot of power vs. PWM in 7200-101. During normal operation, the 7200-101 operates at about 25% blower drive. As the air filter gets clogged, or the air tubing is kinked, for example, the blower drive percentage rises, requiring more power. Flow Module Maintenance 5-17...
  • Page 130 Section 5. Maintenance 5-18 LI-7200RS Enclosed CO₂/H₂O Analyzer...

  • Page 131: Section 6. Troubleshooting

    Section 6. Troubleshooting We address common problems in this section. LI-7200/RS is Identified as an LI-7500A/RS in the Software Interface This is caused by a bad or poorly-connected head thermocouple cable (the one that connects to the accessory connector on the LI-7550 box). Check and tighten the connection at the head and the LI-7550 box.

  • Page 132: Problems With The Smartflux 2 System

    Section 6. Troubleshooting Loose connection? Make sure the power cable connector is tight. Also check the cable for damage and the connections to the power supply. Blown fuse? Check the fuse, as described in Replacing the Fuses on page 5-8. Note that a blown fuse usually indicates some other problem.

  • Page 133: Ethernet Connection Problems

    Section 6. Troubleshooting Check the power supply to the anemometer. Reboot the SmartFlux 2 System by pressing the "reboot" button in the analyzer software (on the SmartFlux tab) or the reset button on the SmartFlux 2 module. System not delivering power or powers on or off unpredictably Check connections in the power supply and correct any faulty connections.

  • Page 134: Rs-232 Serial Connection Problems

    Section 6. Troubleshooting Instrument network settings incompatible with computer or local area network set- tings? If the instrument IP address is set to , you probably will not be able to Static connect to the instrument over a network unless you change the instrument IP address to (Obtain IP address automatically).

  • Page 135: Instrument Software Is Unresponsive

    Section 6. Troubleshooting is the update frequency to be used while the PC software com- Update Rate municates with the instrument. Select from 0.1, 0.2, 0.5, 1, 2, 5, 10, or 20 Hz. At 9600 baud, the maximum update frequency is 2 Hz; at 19200 baud, 5 Hz; at 38400 baud, 10 Hz;...

  • Page 136: Bad Pressure Readings

    LI-7200RS > Cal- match the calibration sheet for the head. You can get your ibration > Coefficients calibration information from the LI-COR web site. The Band Broadening coef- ficient should be 1.15. Signal strength OK? Under the page, check the values of...
  • Page 137 Section 6. Troubleshooting Are the diagnostic flags (PLL, etc.) OK? Under , check the diagnostics. Diagnostics See Diagnostic Messages on page 7-27 for more information. Zero and Span OK? Go to the page and make sure the current values of Calibration zero and span are near 1.
  • Page 138 Section 6. Troubleshooting LI-7200RS Enclosed CO₂/H₂O Analyzer...

  • Page 139: Section 7. Software Reference

    Section 7. Software Reference This section describes features that have not been described elsewhere. Settings Under , you can set the instrument time, network configuration, send com- Settings mands, change the chopper housing temperature set point, and integrate CO meas- urements.
  • Page 140 Section 7. Software Reference The basic principle behind PTP is that the best time keeping can be accomplished with multiple networked devices by synchronizing all device clocks to the most pre- cise clock on the network. Each clock on the network has a rating that indicates its relative accuracy.
  • Page 141 Section 7. Software Reference Setting the Clock Connect to the gas analyzer. Open the Settings dialog box. Set the Clock Sync (PTP). Choose your time zone. Click Apply The PTP clock settings available are: Off: Turns PTP time keeping system off. Instrument time will be determined by the Date and Time set by the user, even if there is a better clock on the net- work.

  • Page 142: Network

    Section 7. Software Reference Network By default, the instrument name that appears in the Ethernet Connect dialog is the Analyzer Interface Unit prefix and its associated serial number (e.g., AIU- 0650). You can change this name in Settings > Net- work (Internet IP address...
  • Page 143 Section 7. Software Reference enter the IP address of the instrument and port 7200 in the connection dialog of the application software to initiate communication. You can select the instrument from the list of instruments on the same network as your computer or connect your computer directly to the instrument Ethernet port.
  • Page 144 Section 7. Software Reference Private Network 192.168.100.5 192.168.100.6 Port 7200 Port 7200 166.66.77.88 The public port number should be changed when there is more than one LI- 7200/RS or LI-7500A/RS in the private network. In this case, to connect to each instrument, two port forwarding rules must be set up, similar to that shown below.

  • Page 145: Manual

    A command line field is present that allows you to send a command to the instru- ment. This can be useful for diagnosing problems, as a LI-COR technician can gauge the instrument’s response to given commands, and determine if the instru- ment is functioning properly.

  • Page 146: Advanced-Chopper Housing Temperature

    Section 7. Software Reference Advanced—Chopper Housing Temperature The chopper motor housing temperature can be set to a lower operating tem- perature (5 °C) in winter to reduce power consumption and minimize heating by the electronics. We recommend changing the setting only when the average ambi- ent temperature drops below 5 °C.
  • Page 147 Section 7. Software Reference Choose a source to be integrated from the Integration Channel list. Choose the method to start the integration; immediately, or using a threshold value. Choose the method to stop the integration; manually, with a threshold value, or after a user- entered elapsed time (s) has expired.

  • Page 148: Menu Overview

    Section 7. Software Reference Menu Overview The LI-7200/RS menu provides access to settings, settings, Input... Output... Cal- , and settings. ibration... PC Logging...Flow Module... Intake Tube... Auxiliary Inputs There are three things to configure under Inputs Can be used for sonic anemometer data analog data. Auxiliary Inputs: Specifies whether the temperature source is the instru- Temperature Source:...
  • Page 149 Section 7. Software Reference Temperature and pressure values are required to convert CO and H O density (mmol/m ) to mole fraction (µmol/mol or mmol/mol). In addition, the analyzer requires a pressure value to compute CO or H O mole density, and a temperature value to perform the band broadening correction for H O on CO In eddy covariance applications we recommend that you use temperature and pres-...

  • Page 150: Outputs

    Section 7. Software Reference where y is the sensor output, x is the voltage output of the sensor, b is the Y-axis intercept (offset), and m is the calibration multiplier, which is the slope of the line representing the sensor’s response. Outputs window allows you to configure the analog output channels, RS-232, Outputs...

  • Page 151: Rs-232 Output

    Section 7. Software Reference The bandwidth selection has no impact on the system delay. The filters Note: were designed so they have exactly the same delay whether a 5, 10, or 20 Hz sig- nal bandwidth is selected. RS-232 Output The RS-232 tab is used to set the instrument's RS-232 port configuration for unat-...

  • Page 152: Ethernet Output

    Section 7. Software Reference Baud Rate Maximum Output Rate (Samples per Second) 19200 38400 57600 115200 Under , you can choose whether or not to output labels with each data Options record, and whether to output diagnostic text records. An example of a data record sent with and without labels is shown below.

  • Page 153: Dac Configuration

    Section 7. Software Reference (Data (Ndx 87665) (DiagVal 757) (Date 2009-09-10) (Time 14:06:44:140) CO2Raw 0.0332911) (H2ORaw 0.19299) (CO2D 5.20672) (H2OD 755.566) (Temp 15.517) (Pres 99.4361)… Data format without labels 87665 757 2009-09-10 14:06:44:140 0.0332911 0.19299 5.20672… The End of Line Delimiters determine the character(s) that terminate the data records.

  • Page 154: Sdm Output

    Section 7. Software Reference For test purposes, you can also choose for the Source, and enter a Set Set Point Point voltage value; the DAC channel will then output that voltage continuously. SDM Output SDM addressing allows multiple SDM-compatible peripherals to be connected to a single Campbell Scientific datalogger.
  • Page 155 Section 7. Software Reference Table 7-1. Parameter 4 value definitions. (...continued) Mode Items Sent dry (µmol/mol) O dry (mmol/mol) (mmol/m O (mmol/m Signal Strength (average) (kPa) total (°C) (°C) Cell Temperature (°C)Aux channel #1 dry (µmol/mol) O dry (mmol/mol) (mmol/m O (mmol/m Signal Strength (average) Head Pressure (kPa)

  • Page 156: Delay Time

    Section 7. Software Reference Table 7-1. Parameter 4 value definitions. (...continued) Mode Items Sent Diagnostic Value (see below) Trigger Mode dry (µmol/mol) O dry (mmol/mol) Signal Strength (average) (kPa) total Cell Temperature (°C) NOTES: LI-7200/RS Mode 7 requires the Campbell datalogger to broadcast a group trigger to cause data to be registered.

  • Page 157: Total System Delay Examples

    Section 7. Software Reference Total System Delay Examples Total System Delay (ms) = Delay Time + (Delay Step × Delay Step Increment) Output Delay Time Delay Step Delay Step Total Delay (ms) (ms) Increment (ms) 6.667 SDM/RS- 6.667 232/Ethernet Bandwidth Bandwidth (5, 10 or 20 Hz) determines the signal averaging done by the digital fil- ter.

  • Page 158: Diagnostic Value

    Section 7. Software Reference Diagnostic Value The cell diagnostic value is a 2 byte unsigned integer (value between 0 and 8191) with the following bit map: bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 Unused Unused...

  • Page 159: Calibration Window Overview

    Section 7. Software Reference Calibration Window Overview The LI-7200RS uses a fifth order poly- nomial for the CO calibration, and a third order polynomial for the H O cal- ibration. Step-by-step instructions for calibrating the gas analyzer can be found in User Calibration on page 4-1.

  • Page 160: Signal Strength Tab

    Section 7. Software Reference Signal Strength Tab tab has a button labeled that you can Signal Strength Reset Signal Strength click if you’ve decided your instrument optics are as clean as you can reasonably make them, and you want to reset the signal strength to 100. See CO2 Signal Strength on page 8-7 for more information.

  • Page 161: Manual Tab

    Section 7. Software Reference absorbed by the detector (see Cross Sensitivity on page 8-3 and Zero Drift on page 8-3). The calibration coefficients, XS, and Z values are unique to each sensor head, and may be found on the calibration sheet shipped from the factory. The Band Broad- ening coefficient is 1.15 for all sensor heads.

  • Page 162: History Tab

    Enter the calibration coefficients from the Calibration Certificate under the Coefficients tab. Zero and span the instrument. Automatic Acquire a calibration file for your instrument. You can get it from the LI-COR sup- port site (www.licor.com/env/support) under calibration information, or you can save it from the LI-7550 ( ).
  • Page 163 Section 7. Software Reference Attach the new sensor head to the LI-7550. Connect the instrument to a computer and establish communications. Select . Choose the file saved earlier; the coefficients will Config Files > Open Configuration automatically be loaded. Manually enter the Box Pressure calibration coefficients from the Calibration Certificate that came with the sensor head under the Coefficients tab.

  • Page 164: Pc Logging

    Section 7. Software Reference PC Logging The PC Logging window is used to configure the data output parameters used while the LI-7500RS or LI-7200RS Windows software is active. Data are logged to a file on your computer. You can specify the destination file, update rate, file dur- ation, comments, and values to be logged.

  • Page 165: Begin Logging Data

    Section 7. Software Reference Begin Logging Data Press to begin logging data. Press to quit logging. The USB Log File Start Stop page also has a button to eject the USB flash drive; note that you can also eject the drive from inside the LI-7550 using the Eject button.

  • Page 166: General Indicators

    Section 7. Software Reference General indicators Diagnostic indicators for the Sync Flag, PLL, Detector Temperature, and Chopper Temperature will read either Service Head – Displays the model of the sensor head currently connected to the LI-7550 Analyzer Interface Unit. The software may display LI-7200 even if an LI-7200RS is connected and LI-7500A even though an LI-7500RS is connected.

  • Page 167: Test Point Values

    Test Points points. Though primarily for LI-COR technician reference, values outside of the normal range may give you an indication of where problems may be originating. Test Point Values...
  • Page 168 Section 7. Software Reference Test Point Description Normal range IR A/D (V) Voltage from IRGA being sent to 0.2 – 4.8 V A/D converter Detector Temp (V) Detector temperature voltage 2.9 V. Readings near +5 V or 0 V are normal for a few seconds after power Aux Ref + 16-bit conversion of positive...
  • Page 169 Section 7. Software Reference Test Point Description Normal range ADC CH4 (V) Analog input channel 4 -5 V to +5 V. A reading near 0 is normal for an open input. Box Pressure (V) Absolute pressure Any value between 0 and Head Pressure (V) Pressure at sensor head 2.5 is normal...

  • Page 170: Waveform

    Waveform tab displays the current Waveform state of the analyzer’s chopping shutter disk. Though primarily for LI-COR tech- nician reference, if problems are encountered, it may be useful to log the waveform data for troubleshooting pur- poses. Waveform data can only be logged when the window is open.
  • Page 171 Section 7. Software Reference Charting page allows real time graphics display of one or two variables plot- Strip Chart ted against time. The Y-Axes (left and right) display the value chosen in the respect- ive menus against time on the X-Axis. Time on the X-Axis can be displayed over user-defined values of seconds or minutes;...

  • Page 172: Configuration Files

    Section 7. Software Reference Note: You can rescale both Y-axes of an active strip chart by right clicking on the chart, holding, and dragging up or down. You can also open as many chart win- dows as you want. Configuration Files The PC software uses a configuration file to store parameters of the instrument con- figuration.

  • Page 173: Section 8. Theory Of Operation

    Section 8. Theory of Operation Relating Absorption to Concentration The scaling law of Jaimeson et. al., (1963) shows the effect of pressure on infrared absorption. If the amount of absorber of some gas u (mol m ) and absorption in a band are related by some function h (), then The subscript i denotes a particular (i...

  • Page 174: Measuring Absorptance

    Section 8. Theory of Operation “known densities”, the ρ values are computed from known concentrations m (moles of gas per mole of air) using the ideal gas law Measuring Absorptance Given a source with radiant power Φ, and a detector some distance away, in the absence of reflection, absorptance by gas i can be determined from where is transmittance through gas i,...

  • Page 175: Cross Sensitivity

    Section 8. Theory of Operation Cross Sensitivity Because the instrument uses one detector for measuring A , and A , (the absorbed and non-absorbed power for CO and H O, respectively), there is a slight cross-sensitivity between gases due to imperfections in the detector's frequency (time) response.

  • Page 176: Equation Summary

    Section 8. Theory of Operation Equation Summary In the atmosphere, the absorption of radiation by water vapor is not significantly influenced by any other gas, so the effective pressure for water vapor P is simply the total pressure P. 8-12 O absorptance, α...
  • Page 177 Section 8. Theory of Operation accounted for in the equivalent pressure of P . A method of doing this (LI-COR Application Note #116) is 8-16 P is pressure, α is the band broadening coefficient, and m is the mole fraction of water vapor.

  • Page 178: Li-7200Rs Implementation

    Section 8. Theory of Operation LI-7200RS Implementation Air pressure, P , (kPa) and temperature, T , (°C) are measured in the sampling cell (see A Note About Pressure And Temperature on the facing page). W is the mole frac- tion of water vapor, and Table 8-1.

  • Page 179: A Note About Pressure And Temperature

    Section 8. Theory of Operation A Note About Pressure And Temperature Since the instrument is calibrated for number density, accurate temperature is not required for the calculation, and accurate pressure measurement is not required, either (equations 8-20 and 8-26). For example, if you introduce a 1% error in the pressure sensor on a perfectly calibrated instrument, the resulting CO mole dens- ity error would be about 0.25%, and the H...
  • Page 180 Section 8. Theory of Operation precipitation, etc.) in the optical path. The values of these signals by themselves is not very informative: all you are guaranteed of is that they will be somewhere between 0 and 65535, but more typically between 25000 to 50000. To get a useful diagnostic out of A and A , one needs to know the expected value for a par-...
  • Page 181 Section 8. Theory of Operation trates this function by showing the range of responses for a large population of LI-7200s. Figure 8-1. The function f(T) characterizes how the raw reference signal varies with tem- perature. The C and W values are determined at the factory, but they are not really “factory parameters”;...

  • Page 182: Delta Signal Strength

    Section 8. Theory of Operation 8-37 8-38 The instrument’s grammar also makes the individual values (S and S ) available for output. Delta Signal Strength Why Delta Signal Strength? The concern when checking a source strength dia- gnostic is “Is the optical cell clean?” However, the bigger underlying concern is “Has the calibration drifted enough to matter?”...

  • Page 183: Li-7200Rs Transfer Functions And Signal Processing

    Section 8. Theory of Operation LI-7200RS Transfer Functions and Signal Processing The LI-7550 Analyzer Interface Unit used with the LI-7200/RS has a Digital Signal Processing (DSP) bandwidth that is selectable in the Outputs>Setup window. A plot of the transfer functions for the 3 selectable DSP bandwidths is shown below in Figure 8-2 below.
  • Page 184 Section 8. Theory of Operation 8-12 LI-7200RS Enclosed CO₂/H₂O Analyzer...

  • Page 185: Appendix A. Specifications

    Appendix A. Specifications Measurements Calibration Range: 0 to 3000 µmol mol Accuracy: Within 1% of reading Zero Drift (per °C): ±0.1 ppm typical; ±0.3 ppm maximum RMS Noise (typical @ 370 ppm CO @5 Hz: 0.08 ppm @10 Hz: 0.11 ppm @20 Hz: 0.16 ppm Gain Drift (% of reading per °C @ 370 ppm): ±0.02% typical;...
  • Page 186 Appendix A. Specifications General Fundamental Gas Sampling Rate: 150 Hz Bandwidth: 5, 10, or 20 Hz; software selectable Type: Absolute, non-dispersive infrared gas analyzer Detector: Thermoelectrically cooled lead selenide Path Length: 12.5 cm (4.72") Optical Cell Volume: 16 cm Optical Cell Thermocouples (Input and Output): Max.
  • Page 187 Appendix A. Specifications Gas Analyzer Dimensions Appendix A. Specifications...
  • Page 188 Appendix A. Specifications LI-7550 Dimensions LI-7200RS Enclosed CO₂/H₂O Analyzer...
  • Page 189 Appendix A. Specifications Insulated Intake Tube Specifications 0.25" (6.35 mm) Outside Diameter: 0.21" (5.334 mm) Inside Diameter: 0.020" (0.51 mm) Wall Thickness: 40" (101.6 cm) Length: 102 cm Intake tube path length when assembled: 106.5 cm Intake tube path length with Swagelok® filter: 304 Stainless Steel Material: Appendix A.
  • Page 190 Appendix A. Specifications Heated Intake Tube Specifications 10.5 - 30 V Input Voltage: 0.1 W to 6 W (Heat density ratio: 2:1 short tube to long Total Output Wattage: tube) -40 °C to 50 °C Operating Temperature Range: RS-485 Data Communication Protocol: 5.33 mm (0.21”) Intake Tube Inside Diameter: 6.35 mm (0.25”)
  • Page 191 Appendix B. Pin Assignments LI-7550 Pin Assignments AUXILIARY INPUT DAC OUTPUT PIN 1 BROWN SDM_EN PIN 1 WHITE AUX1+ PIN 1 WHITE DAC1 PIN 2 WHITE SDM_CLK PIN 2 BROWN AUX1- PIN 2 BROWN DAC2 PIN 3 BLUE SDM_DATA PIN 3 GREEN AUX2+ PIN 3...
  • Page 192 Appendix B. Pin Assignments LI-7200RS Enclosed CO₂/H₂O Analyzer...
  • Page 193 The company names, addresses, and phone numbers are the most current we have at the time of this printing. In some cases the information may change without notice. Chemical Sources Material LI-COR Part Number Ascarite II, 500 g 9970-022 Magnesium Perchlorate, 2 kg 9960-078...
  • Page 194 OCP Group Inc 7130 Engineer Rd San Diego, CA 92111 Phone: 858-279-7400 www.ocp.com LI-COR Part Cable Cable Connector OCP Part Number Number 392-13984 19-pin head 19-pin male to Specify LI-COR 392-13984 and cable female the length you prefer LI-7200RS Enclosed CO₂/H₂O Analyzer...
  • Page 195 16 GB industrial grade drives are available directly from LI-COR. Contact us for more information. NOTE: The USB flash drive listed below has been tested by LI-COR; if you want to use other drives in the LI-7550, please contact LI-COR for more information.
  • Page 196 Appendix C. Suppliers LI-7200RS Enclosed CO₂/H₂O Analyzer...
  • Page 197 Appendix D. Configuration Grammar Note: This grammar supports the core features of the instrument, but some func- tions are not fully described. Contact us if you have questions. This section describes the protocol used by the instrument to communicate via RS- 232 and Ethernet, for both configuration and data output purposes.

  • Page 198: Command Summary

    Appendix D. Configuration Grammar In this case, we are setting the RS-232 output frequency to 10Hz, requesting that Pressure be included in the output records, and that the bandwidth be 5 Hz. Notice the 2 parentheses at the end of .
  • Page 199 Appendix D. Configuration Grammar {int} means an integer value, such as 0, 10, 452, etc. {float} means any integer or floating point value, such as 0, 3.14159, 1E-7, -3.47e-09, etc. {string} means anything (< 40 characters) contained by double quotes, such as "Hey, you!"...
  • Page 200 Appendix D. Configuration Grammar Command Subcommands Remarks (Outputs (RS232 (Baud {9600 | 19200 | 38400}) Baud rate for RS-232 (Freq {float}) Output frequency of (Data..) records in Hz. Usable values: 0.0 thru 20.0 (Labels {bool}) (DiagRec {bool}) (EOL {"hex code(s)"}) User defined termination character(s) for data record in "hex"...
  • Page 201 Appendix D. Configuration Grammar Command Subcommands (Metadata (Log {bool}) (Site (site_name {string}) (altitude {float}) (gpsformat {DDD MM SS.SSS | DDD MM.MMM | Decimal Degrees}) (latitude {+|- xxxd xx' xx.xxx"} | {+|- xxxd xx.xxx'} | {+|- xxx.xxxx} (longitude {+|- xxxd xx' xx.xxx"} | {+|- xxxd xx.xxx'} | {+|- xxx.xxxx} (canopy_height {float})
  • Page 202 Appendix D. Configuration Grammar (EOL "{hex code(s)"}) End of Line character. Enter hex value in double quotes. Example: (Outputs(RS232(EOL "0D0A”)))lf would terminate data strings with a carriage return and a line feed. (Ndx {bool}) Determines whether an index value is transmitted or not. Example: (Outputs(RS232(Ndx TRUE)))lf would cause the data stream to contain an index value.
  • Page 203 Appendix D. Configuration Grammar NOTE: The (DiagRec and the (DiagVal are two separate outputs and are inde- pendent of one another. (Labels {bool}) This command controls whether or not data labels are transmitted with the data stream. Default is TRUE, and this means that data are transmitted in the normal (Data) format record.
  • Page 204 Appendix D. Configuration Grammar 252 250 0.15401 32.2167 0.03569 196.703 24.33 98.6 0 1.5730 511 250 0.15404 32.2174 0.03572 196.816 24.42 98.5 0 1.5683 765 250 0.15402 32.2342 0.03579 196.995 24.49 98.6 0 1.5703 1033 250 0.15400 32.2097 0.03571 196.771 24.63 98.5 0 1.5724 1288 250 0.15405 32.2341 0.03578 196.838 24.76 98.5 0 1.5734 1544 250 0.15406 32.2385 0.03575 196.782 24.72 98.5 0 1.5724 Examples:...
  • Page 205 Appendix D. Configuration Grammar Table D-2. Data and Diagnostic Records Record Subcommands Remarks (Data (Ndx {int}) Index value. Increments by 150 The values included are set every second. by (Outputs(...)). How often this is output is determined (Time {}) Time by (Outputs (Freq...)).
  • Page 206 Appendix D. Configuration Grammar Table D-2. Data and Diagnostic Records (...continued) Record Subcommands Remarks (Data (CO2AW {float}) Source The values included are set by (Outputs(...)). How often (CO2AWO {float}) Reference this is output is determined (CO2Raw {float}) absorptance by (Outputs (Freq...)). (CO2D {float}) density (mmol m (CO2MF {float})
  • Page 207 Appendix D. Configuration Grammar Record Subcommands Remarks (Diagnostics (Path {float}) Average Signal Strength (0-100) Diagnostics are always output at 1 Hz (Synch Synch (always true) {bool}) (PLL {bool}) Phase lock loop status (DetOK Detector temperature control {bool}) (Chopper Chopper temperature control {bool}) (PDif {bool}) Differential pressure...
  • Page 208 Appendix D. Configuration Grammar Examples: A typical (Data..) output record, with all items present, is shown below: (Data (Ndx 215713)(CO2Raw 1.2831902e-1)(CO2D 2.2083146e1)(H2ORaw 5.5372476e-2)(H2OD 3.5485935e2)(Temp 2.5886261e1)(Pres 9.8157062e1)(Aux 0) (Cooler 1.0537354)) A typical (Diagnostics..) record is shown below: (Diagnostics (Sync TRUE)(PLL TRUE)(DetOK TRUE)(Chopper TRUE)(Path 63)) Data Polling (Software and Hardware) A software command using the ENQ character (0x05) is available to query the instrument for a data record over RS-232.
  • Page 209 Data are updated to RS-232 at 20 Hz. If the CTS line is toggled, record will be out- put the next time one is ready. The CTS line is pin 7 on the LI-COR RS-232 Cable, part number 392-10268. The RS-232 serial pin-out from a DB9 connector on an AT...
  • Page 210 Appendix D. Configuration Grammar The (Inputs..) Command The (Inputs..) command is used to scale the Auxiliary input channel, and to determ- ine how pressure and temperature are measured by the instrument. Table D-3. The Inputs Command. Command Subcommands Remarks (Inputs (Pressure (Source { Aux | Measured | How it is determined...
  • Page 211 Appendix D. Configuration Grammar The (Calibrate...) and (Coeffs...) Commands commands control zeroing, spanning, and (Calibrate..) (Coeffs..) factory calibration coefficients. The subcommand must be present, and (Date (Val must be absent to perform . For (ZeroH2O (ZeroCO2 (SpanCO2 (SpanH2O must be present, and must be absent to trigger a cal- (Date (TDensity...
  • Page 212 Appendix D. Configuration Grammar Command Subcommands Remark (Coeffs (Current (SerialNo {quoted string}) The 72H-xxxx head number. (Band (A {float})) The band broadening coefficient (1.15). (CO2 (A {float}) These values are found on the calibration sheet. SD1, (B {float}) SD2, and SD3 are b1, b2, (C {float}) and b3 from equation 8-17.
  • Page 213 Appendix D. Configuration Grammar If the temperature is 23°C, and the pressure 98kPa, then the mode density is 15.92 mmol CO . Then send the following: (Calibrate(SpanCO2(Target 400)(Tdensity 15.92)(Date "14 Sept 2015"))) The Program Reset Command is the equivalent of pressing the reset button on the main (Program(Reset TRUE)) board.
  • Page 214 Appendix D. Configuration Grammar Flow Module Command Table D-7. Flow Module Commands Record Subcommands Remarks Communication address of Flow (BusAddress {int}) Module (32 to 255) 0: Flow On, 1: Flow Off (State {0|1} Set flow module output, SLPM (SetFlowRate {float}) Read Only –...
  • Page 215 Appendix D. Configuration Grammar The Query Command The Query (?) command is used to query the instrument for any configuration para- meter individually, as well as any node in the configuration tree. Table D-8. Query Commands Command Remarks (Outputs ?) The query for individual parameters works only for (Calibrate ?) configuration parameters and not data or diagnostic...
  • Page 216 Appendix D. Configuration Grammar Example Response: (Coef (Current (SerialNo 75H-Beta6)(Band (A 1.15))(CO2 (A 1.56704E+2)(B 2.15457E+4)(C 4.33894E+7)(D -1.24699E+10)(E 1.75102E+12)(XS 0.0023)(Z 0.0002))(H2O (A 5.24232E+3)(B 3.91896E+6)(C -2.33026E+8)(XS -0.0009)(Z 0.0185))(Pressure (A0 56.129)(A1 15.250))(DPressure (A0 1.0)(A1 0.0)))) (Outputs ?)lf causes a Outputs record to be put in the output queue. Example Response: (Outputs (BW 10)(Delay 0)(SDM (Address 7))(Dac1 (Source NONE)(Zero -5e-2) (Full 4e-1))(Dac2 (Source PRESSURE)(Zero -1e-1)(Full 4e-1))(RS232 (Baud 38400)
  • Page 217 Appendix D. Configuration Grammar Example Response: (Data (Ndx 2471)(DiagVal 250)(CO2Raw 1.6319131e-1)(CO2D 3.5119712e1) (H2ORaw 3.1672954e-2)(H2OD 1.7067077e2)(Temp 2.3874512e1)(Pres 9.8735609e1)(Aux 0)(Cooler 1.5630015)) (Diagnostics ?)lf causes a Diagnostics record to be put in the output queue. Example Response: (Diagnostics (SYNC TRUE)(PLL TRUE)(DetOK TRUE)(Chopper TRUE)(Path 65)) (EmbeddedSW ?)lf causes an EmbeddedSW record to be put in the output queue.
  • Page 218 Appendix D. Configuration Grammar The Connection Protocol The purpose of this section is to describe the protocol used to establish com- munications with the instrument when it is operating in an “unknown” mode. That is, when the baud rate is not known, nor are any other details about the instru- ment’s configuration.
  • Page 219 Inc.'s examination discloses to have been defective in material or workmanship without charge and only under the following conditions, which are: The defects are called to the attention of LI-COR, Inc. in Lincoln, Nebraska, in writing within one year after the shipping date of the instrument.
  • Page 220 The foregoing constitutes LI-COR, Inc.'s sole obligation and liability with respect to damages resulting from the use or performance of the instrument and in no event shall LI-COR, Inc. or its representatives be liable for damages beyond the price paid for the instrument, or for direct, incidental or con- sequential damages.
  • Page 221 Appendix F. Index history, 7-24 restore, 7-24 Air Filter, 5-15 Cell Pressure, 8-7 Ascarite II, 5-4 Cell Temperature, 8-7 Auxiliary Inputs Charts, 7-33 configuring, 7-10 Chopper Housing Temperature, 7-8 Auxiliary Sensor Interface, 2-19 Cleaning about connections, 2-21 optics, 5-3 connecting sensors, 2-21 Clock, 7-1, 7-2 mounting, 2-19 Commands, D-2, D-8...
  • Page 222 Appendix F. Index Dessiccant, 5-4 Diagnostic GHG file bit, 7-20 defined, 3-6 indicators, 7-27 GHG Software, 3-1 test point, 7-29 update, 5-11 Dirt cleaning the optics, 5-3 clock, 3-19 DSP, 8-11 format, 3-22 Dust Filter, 2-9 Grammer, D-1 Cleaning, 5-7 Graphs, 7-33 eastward separation, 3-30, 3-35 Heads...
  • Page 223 Appendix F. Index sensor separation, 3-30, 3-35 Serial Connection, 3-3 Maintenance Signal Processing, 8-11 intake, 5-7 Signal Strength, 7-22, 8-7 meteorological measurements, 3-36 delta, 8-10 SmartFlux 2 advanced mode, 3-48 network settings, 7-4 clock, 3-19 northward separation, 3-30, 3-35 configuration file, 3-56 connect, 3-38 Soda Lime, 5-4 Software Update...
  • Page 224 Appendix F. Index Tube Length, 3-32 Tutorial, 2-1 logging, 3-45 vertical separation, 3-30, 3-35 Windows Software, 3-1 Winter Setting, 7-8 XML, D-1, D-2, D-8 example commands, D-15 sending commands, 7-7 Zero checking, 4-2 command, D-15 stability, 4-1 LI-7200RS Enclosed CO₂/H₂O Analyzer...
  • Page 226 Regional Offices LI-COR Biosciences GmbH Siemensstraße 25A 61352 Bad Homburg Germany Phone: +49 (0) 6172 17 17 771 envsales-gmbh@licor.com LI-COR Biosciences UK Ltd. St. John’s Innovation Centre Cowley Road Cambridge CB4 0WS United Kingdom Phone: +44 (0) 1223 422102 envsales-UK@licor.com LI-COR Distributor Network: www.licor.com/env/distributors...

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