LI-COR LI-7820 Instruction Manual
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LI-COR LI-7820 Instruction Manual

N2o/h2o trace gas analyzer
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LI-7820 N
O/H
O
2
2
Trace Gas Analyzer
Instruction Manual

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Summary of Contents for LI-COR LI-7820

  • Page 1 LI-7820 N Trace 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 Notes on Safety This LI-COR product has been designed to be safe when operated in the manner described in this manual. The safety of this product cannot be assured if the product is used in any other way than is specified in this manual. The product is intended to be used by qualified personnel.
  • Page 5 Check your local regulations to determine if WLAN is permitted. If WLAN is not permitted in your area, it is your responsibility to disable the WLAN signal. LI-COR, Inc. cannot be held liable for any problems arising from the use of WLAN in any countries or regions where it is not permitted. Legal pen- alties may result from failing to disable or re-enabling the wireless network where it is not permitted, modifying or altering the product, or removing the certification labels from the product.

  • Page 6: Preface

    Preface This document provides basic operating instructions for the LI-7820 N Trace Gas Analyzer. We have made every effort to ensure that this document accurately represents the instrument. As with any software-dependent instrument, development con- tinues after the documentation goes to press. As a result, small inconsistencies between the documentation and the instrument may be present.

  • Page 7: Table Of Contents

    Contents Preface Section 1. Introduction to the LI-7820 What's what Gas analyzer Rechargeable batteries Universal power adapter Ethernet cable Accessory kit Optional accessories Auxiliary power cable Backpack kit Section 2. Getting started Powering on the instrument Power options Universal power adapter...
  • Page 8 Downloading a data file Components of the data file Installing the instrument in a rack mount Section 4. Software overview Home page Indicators and buttons Remarks Graphs Settings Software Time Network Wi-Fi LI-8100/A Calibration 4-10 Diagnostics 4-11 Power 4-11 Performance status indicators 4-11 Diagnostic log 4-12...
  • Page 9 Instrument calibration Setting the N2O span and zero Recovering from a bad calibration Replacing the air inlet filter Replacing the purge dry-down chemical Software updates Section 7. Communication with the MQTT protocol Terminology Basic commands in a terminal program Streaming data into the interface Setting the zero calibration Setting the span calibration Rebooting the instrument...
  • Page 10 viii...

  • Page 11: Section 1. Introduction To The Li-7820

    OF-CEAS. What's what If you have just taken delivery of the instrument, check your packing list to be sure you received everything that you ordered. The LI-7820 includes some or all of the following components. Gas analyzer The gas analyzer is in a gray enclosure.
  • Page 12 Section 1. Introduction to the LI-7820 The analyzer should not be allowed to sit in standing water, exposed to driving rain, or deployed outdoors without weather protection. Use caution to avoid draw- ing water into the analyzer air inlet! Although equipped with software protection...

  • Page 13: Rechargeable Batteries

    Section 1. Introduction to the LI-7820 tubes. Additional nuts and ferrule sets are include in the accessories kit. Warning: Do not exceed the maximum absolute pressure rating of 110 kPa. Advertissement: Ne dépassez pas la pression nominale absolue maximale de 110 kPa.

  • Page 14: Ethernet Cable

    Section 1. Introduction to the LI-7820 compatible with 100 to 240 VAC, 50 to 60 Hz. The instrument will include one of the cords listed in Table 1-1 below. The power adapter and cord are for indoor use; they are not rated for outdoor deployment.

  • Page 15: Accessory Kit

    Section 1. Introduction to the LI-7820 Accessory kit The accessory kit includes some accessories and replacement components that may Part Number 9978-195 be useful to you. Additional replacement parts are available from LI-COR or your local distributor. Description Quantity Part Number...
  • Page 16 Section 1. Introduction to the LI-7820 The analyzer is secured in the backpack with several straps. The bottom of the instrument will be against your back. The tubes can face up or down. Use caution with the backpack kit: Close the clasps and tighten the straps so that the instrument is secure.

  • Page 17: Section 2. Getting Started

    See Powering off the instrument on page 2-10 for additional details. LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 18: Power Options

    The 10.5 to 33 VDC power ter- minals (pins 3 and 4; Table 2-1 on page 2-4) do not charge the batteries. The charge status is given in the web interface, the instrument display, and on the battery. LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 19: External Power Source

    Section 2. Getting started Charging batteries with an external charger The optional single-bay charger (part number 590-11830; Inspired Energy CH7000A) can charge one battery at a time. To use the charger, plug it into a wall socket and place a battery in the dock. The charger is compatible with 100 to 240 VAC power at 50 to 60 Hz.

  • Page 20: Connecting With The Instrument

    Assignment Color Description Power (+) 24 VDC; 6 Amps from the LI-COR power adapter. These pins, when paired to ground (2 and 6), will power the device and charge the batteries. Not Power (+) powered through the auxiliary power cable (9968- 242).

  • Page 21: Connecting Over Wireless

    The illegal use of WLAN may be punishable under these regulations. Check your local regulations to determine if WLAN is permitted. LI-COR, Inc. cannot be held liable for any problems arising from the use of WLAN in any countries or regions. Legal penalties may result from any of the following: enabling Wi-Fi where it is not permitted, modifying or altering the product, or removing the certification labels from the product.

  • Page 22: Connecting Over A Wired Network

    Dynamic IP address on the display panel if the network cable is connected. Press to connect. Enter If you are unable to connect, see troubleshooting Connection problems on page 5-1. LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 23: Enabling And Disabling Wi-Fi

    Section 2. Getting started Enabling and disabling Wi-Fi To alter the Wi-Fi setting, connect to the instrument using a wired network con- nection (see Connecting over a wired network on the previous page). Click Options > Settings Click the tab. Wi-Fi Set Wi-Fi to Click...

  • Page 24: Instrument Display

    The battery icon is not dis- played when no batteries are installed. Indicates the power source (AC if power cable connected). Power Status: Indicates performance status of the instrument. Performance Status: The gases measured and their concentrations. Gases: LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 25: Status Codes

    If not resolved after 60 to 90 minutes of operation, contact LI-COR or your sales representative. SD card error. This message may be issued briefly during warmup or during a firmware update. It should be dismissed quickly. If not, contact LI-COR or your sales representative. Status codes...

  • Page 26: Powering Off The Instrument

    Caution: Failure to complete the dry-down while powering off the instrument may result in condensation in the optics, which may damage the instrument and require repairs. 2-10 LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 27: Storing The Instrument

    Section 2. Getting started Storing the instrument The instrument can be placed in short-term storage (for several weeks) without any special preparations. For longer-term storage (longer than a month), we recom- mend that you remove the batteries from the case and clean and dry the instrument exterior with a soft damp (not dripping) cloth and mild detergent if needed.
  • Page 28 Section 2. Getting started 2-12 LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 29: Section 3. Applications Of The Li-7820

    Section 3. Applications of the LI-7820 In this chapter we provide information about using the instrument in field or labor- atory applications. We cover connecting plumbing to the air inlet, retrieving data, and other applications. Flow schematic During normal operation, air is drawn into the analyzer through the air inlet (Fig- ure 3-1 below).

  • Page 30: Soil Gas Flux Measurements

    Section 3. Applications of the LI-7820 Soil gas flux measurements The LI-7820 works well for soil gas flux measurements when coupled with the LI- 8250 Multiplexer and the Smart Chamber. All hardware, cables, and tubing required for the connection is available for purchase. The digital communication connection is established through the LI-8250 or Smart Chamber web interface.

  • Page 31: Plumbing A Subsample

    Contact LI-COR technical support (envsupport@licor.com) if you have questions about your application. A typical sampling application will use the LI-7820 to subsample a gas from a main sample line. Air passes a single time through the gas analyzer before it is dis- charged.

  • Page 32: Retrieving Data From The Instrument

    Section 3. Applications of the LI-7820 Retrieving data from the instrument The LI-7820 records all of its data after it has warmed up. There is no way to turn data logging on or off because data are always logged. When used with the Smart Chamber or LI-8250 Multiplexer, measured values are transferred automatically to the Smart Chamber or LI-8250.

  • Page 33: Components Of The Data File

    Section 3. Applications of the LI-7820 Components of the data file The text file will include a file header, data header, and data. File header The file header provides information about the instrument that measured the data. Header Label Description...
  • Page 34 Section 3. Applications of the LI-7820 DATAH DATAU Description RING_DOWN_TIME µsecs Indicator of cavity resonance THERMAL_ °C Optical enclosure temperature ENCLOSURE_T PHASE_ERROR counts Dimensionless indicator of mode lock state LASER_T_SHIFT °C Shift in laser center wavelength from factory calibration INPUT_VOLTAGE Power supply voltage Checksum;...

  • Page 35: Installing The Instrument In A Rack Mount

    Installing the instrument in a rack mount The LI-7820 can be mounted in an instrument rack with a stationary or sliding shelf with dimensions of at least 33 cm by 61 cm (13" by 24") with 18 cm (7") of vertical clearance.
  • Page 36 Section 3. Applications of the LI-7820 LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 37: Section 4. Software Overview

    You'll see the instrument serial number and status in the upper left. Normal oper- ation is indicated by a green dot. A warmup or other status is indicated by an exclamation point in a yellow or red dot beside the instrument name. LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 38: Remarks

    To enter a remark, simply type it into the field and click . The remark Start Remark will be recorded with each data record until you click End Remark LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 39: Graphs

    Section 4. Software overview Graphs In the graphs, you can click and drag to by double-click- zoom in reset the zoom ing the graph. For any gas, you can click the rectangular panel to view more details, including the current measurement, mean, standard deviation, and slope for the displayed time range.

  • Page 40: Settings

    , you can check the software version, check for updates, Settings > Software and change the language setting. Click to check for software updates. The Check instrument must be online to check. See Software updates on page 6-7 for update instructions. LI-7820 N₂O/H₂O Gas Analyzer...
  • Page 41 Section 4. Software overview setting is configured under software settings. The interface can be Language displayed in English, Spanish, and simplified Chinese languages. The language set- ting is retained in the web browser, not the instrument. If you connect with a dif- ferent browser or different computer, or if you clear your browser cache, the default language setting will be applied (English).

  • Page 42: Time

    NTP: chronization between computers and devices. You can use the default settings of or select an NTP server, either from your network or the internet. A list of auto NIST time servers is available from https://tf.nist.gov/tf-cgi/servers.cgi. LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 43: Network

    Section 4. Software overview Precision Time Protocol. A network time protocol designed for high accur- PTP: acy (microsecond to nanosecond) time synchronization between clocks. If Auto Sync is cleared, you can enter a date manually. Date: If Auto Sync is cleared, you can enter the time manually. Time: When the instrument time setting is set to and the instrument is con-...

  • Page 44: Wi-Fi

    If you have difficulty connecting, try changing the channel that the instrument uses. LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 45: Li-8100/A

    Section 4. Software overview When Wi-Fi is on, the instrument will create a local network that is not connected to the global internet. You should see the network on the list of available networks. The network name is the same as the instrument serial number. If you change the settings, click to apply them.

  • Page 46: Calibration

    Do not change the settings unless you are certain that your actions will improve the performance of the instrument. See Instrument calibration on page 6-1. allows you select a previous zero and span setting. Restore Span/Zero reloads the factory original zero and span calibration parameters. Factory Reset 4-10 LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 47: Diagnostics

    Section 4. Software overview Diagnostics section provides instrument performance information, including Diagnostics the status, warnings, and diagnostic information. Power In the upper left, the option allows you to power off or restart the instru- Power ment. The instrument cannot be powered on remotely. Performance status indicators In the upper right, nine bubbles provide more detailed status information.

  • Page 48: Diagnostic Log

    Download Diagnostic Log formance information. This option should be used in consultation with LI-COR technical support in order to resolve performance issues. Diagnostic log files can be very large, (hundreds of MB, depending on the time and date range), so we recom- mend that you constrain the dates to a narrow time window when downloading a diagnostic log.

  • Page 49: Operating Information

    Section 4. Software overview Operating information The bottom portion of the window provides more details about the instrument oper- ating history and status. is the number of hours that the pump has operated. Pump Operating Hours To fine-tune the pump drive voltage, which can remove oscil- Pump Adjustment: lations in data (if present).

  • Page 50: Layouts

    Layouts You can customize the graphical layout. If, for example, you are only interested in viewing N O measurements, you can select a layout that displays one gas and then select the gas of interest. 4-14 LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 51: Thresholds

    Section 4. Software overview Thresholds The software provides simple, configurable indicators of whether the measured gas concentration exceeds or drops below a threshold. It provides color-coded indicators when the measured gas is within or outside of the specified range. When you have set a for a gas, the home page will indicate if the Low Threshold...
  • Page 52 Section 4. Software overview 4-16 LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 53: Section 5. Troubleshooting

    PC network cable are connected to the same local network. Network not detected by the instrument? Check the IP address given on the instru- ment display. If the display says IP:down, the instrument is not detecting a suitable LI-7820 N₂O/H₂O Gas Analyzer...
  • Page 54 + R) and type and press Enter ncpa.cpl In the Network Connections window, double click the icon that represents your network con- nection, and then click Properties Double click to open the IPv4 Window. Internet Protocol Version 4 (TCP/IP) LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 55: Unable To Connect With The Instrument Over A Wireless Connection

    Section 5. Troubleshooting In the window that opens, select and enter an IP address that is Use the following IP address compatible with the instrument IP address. The first three octets will be the same as the instru- ment IP address, but the final set of octets must be different. Device Compatible IP Addresses LI-78xx...

  • Page 56: Measurement Problems

    Adjusting the pump speed could decouple the vibration from the sampling and resolve the oscillations. See Pump Adjustment under Operating information on page 4-13 for more details. Interface issues Some issues related to the display settings are described here. LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 57: The Interface Is In A Language That I Don't Understand

    Section 5. Troubleshooting The interface is in a language that I don't understand The interface can be displayed in English, Spanish, and Simplified Chinese. If you need to change the language setting, click . The language setting Options > Settings is stored in the web browser.

  • Page 58: Code 128 Triggered

    In either case, power off the instrument, clear the obstruction, replace the filters (see Replacing the air inlet filter on page 6-4), and power the instrument back on. You must restart the instrument to resolve code 128. LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 59: Section 6. Maintenance

    Section 6. Maintenance The LI-7820 will require little maintenance. There are no user-serviceable parts in the instrument except for the air inlet filter, air dry-down chemical, and pump. Do not attempt to disassemble the instrument or conduct any maintenance procedures other than those described here.

  • Page 60: Setting The N2O Span And Zero

    Under , click . The software will indicate that a zero cal- Options > Calibration Zero ibration has started and it will not report concentrations until the zero is set. This usually takes about 5 minutes. LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 61: Recovering From A Bad Calibration

    Section 6. Maintenance Switch back to the N O span gas. Wait for the reading to stabilize,. Under , enter the concentration of the gas and Options > Calibration > N O Span click Span N Recovering from a bad calibration In the event that an attempt to zero or span fails to work as intended, you can restore previous zero and span settings by selecting the file and clicking Restore...

  • Page 62: Replacing The Air Inlet Filter

    — one on each side. Align the centers of the filters and the metal disks. Assembly is the reverse of disassembly. You do not need to use thread locking compound on the threads. Tighten them snugly. LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 63: Replacing The Purge Dry-Down Chemical

    Section 6. Maintenance Replacing the purge dry-down chemical The purge chemical, consisting of silica gel beads, is contained in a non-porous tube. The instrument will pump air through the purge tube during the power-off routine to ensure that the optics are free of water vapor while the instrument is in storage.
  • Page 64 The tube will open and the silica gel beads will spill in the case. It is a situation easily avoided by tightening the clamp screws securely. LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 65: Software Updates

    (Windows only). Launch the application. It will display a list of all LI-7810, LI-7815, and LI-7820 instruments on your network. The instrument that you want to update must be connected to your network or computer.
  • Page 66 Section 6. Maintenance LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 67: Section 7. Communication With The Mqtt Protocol

    Section 7. Communication with the MQTT protocol The LI-7820 Trace Gas Analyzers can communicate with devices using the Message Queuing Telemetry Transport (MQTT) protocol. MQTT is a machine-to-machine communication protocol that supports many programming languages, described at github.com/mqtt/mqtt.github.io/wiki/libraries. The instrument uses the Eclipse Mosquito, an open source MQTT broker.

  • Page 68: Basic Commands In A Terminal Program

    Section 7. Communication with the MQTT protocol Table 7-1. Topics and hierarchy in the LI-7820. Topic Description Hierarchy Data licor/niobrara/output/concentration Header for the data file licor/niobrara/output/concentration/units Diagnostic information for licor/niobrara/output/diagnostics data Header for diagnostic licor/niobrara/output/diagnostics/units information Set and read the calibration...

  • Page 69: Streaming Data Into The Interface

    Section 7. Communication with the MQTT protocol Streaming data into the interface This tutorial subscribes to the topic. Subscribing is described in depth at data mosquitto.org/man/mosquitto_sub-1.html. Launch the terminal or command prompt and open the directory that has the Mosquitto apps. The default directory is Program Files\mosquitto Enter the following command to subscribe to the topic.

  • Page 70: Setting The Zero Calibration

    (up to 5 minutes). Wait until the process is finished before moving on to other commands. To check if the zero is complete, enter the command: mosquitto_sub -h 172.24.82.41 "licor/niobrara/cfg/Start_Peak_Base_Line_Cal The instrument will reply with "0" Type to stop the script. Ctrl + C LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 71: Setting The Span Calibration

    N O concentration in PPB. "<N2O tank in ppb>" This initiates the span calibration in the LI-7820. The span is implemented imme- diately. To check if the span is complete, enter the command: mosquitto_sub -h 172.24.82.42...

  • Page 72: Rebooting The Instrument

    To power off the instrument, send the following command: mosquitto_pub -h 172.24.82.41 "licor/niobrara/system/shutdown" "shutdown" This initiates the shutdown, beginning with a purge of the optics. There is no com- mand to power on the instrument remotely. LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 73: Basic Commands With A Python Script

    Section 7. Communication with the MQTT protocol Basic commands with a Python script Python scripts can be used in Windows, macOS, and Linux operating systems, and with other computing devices. Here we describe some basic processes on Windows and macOS computers. Configuring paho-mqtt in Windows Python is not included with Windows by default, but you can download a suitable version from the Microsoft Store.

  • Page 74: Streaming Data Into The Terminal Program

    ( is a placeholder, used as an example). Then type User.Name to launch the script created in step 1. Data will stream into python read-data.py the terminal program. Type to stop the script. Ctrl + C LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 75: Downloading Data In A Date And Time Range

    Section 7. Communication with the MQTT protocol Downloading data in a date and time range The following script will download data from instrument. The script includes a date and time range, file duration (minutes), as well as the directory that the files are saved to, all of which can be modified to suit your needs.

  • Page 76: Additional Commands

    Python scripts can be also used to set zero/span, reboot, or shutdown the instru- ment by using the publish option available in the Paho MQTT python client sim- ilar to mosquito_pub. To shutdown the instrument, send the command client.publish (“licor/niobrara/system/shutdown”,”shutdown”) 7-10 LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 77: Appendix A. Measurement Overview

    Figure A-1. Simplified schematic of the LI-7820 flow path through the optical bench. The phase adjuster is a volume in the path between the laser and optical bench that is tied to a pressure control mechanism.
  • Page 78 Figure A-2. Example of a scan showing the absorption features for a number of gases. The upper line (dark blue) is the reference signal, and the lower line (green) is the sample sig- nal at each of cavity resonance modes. LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 79: Appendix B. Additional Safety Information

    The LI-7820 is certified as a Class I laser product. No hazardous radiation is emit- ted from the instrument. Any laser radiation emitted is below the Class I laser lim- its during all phases of user operation.
  • Page 80 Appendix B. Additional safety information Figure B-1. The Class 1 laser safety label is affixed to the back of the case. Figure B-2. The laser radiation safety label is inside the instrument case. LI-7820 N₂O/H₂O Gas Analyzer...
  • Page 81 Appendix B. Additional safety information Wireless communication notice The instrument is equipped with wireless communication (Wi-Fi™) capabilities. Wi-Fi communication conforms to the requirements in this section. See Connecting over wireless on page 2-5 for more details. Channel Lower Frequency Center Frequency Upper Frequency Number (mHz)
  • Page 82 To remove the primary batteries, turn the clasp counter-clockwise ¼ turn to open the battery door. Grasp the tab on the battery and pull to remove the battery. There is space for two batteries. Be sure to remove both of them. LI-7820 N₂O/H₂O Gas Analyzer...
  • Page 83 Appendix B. Additional safety information Coin-cell battery The product includes a CR Lithium coin-cell battery, which contains perchlorate material. Special handling may apply. In the U.S. State of California, see www.dtsc.ca.gov/hazardouswaste/perchlorate. To remove the coin-cell batteries, power off the instrument, remove the batteries, and open the lid to the case.
  • Page 84 Appendix B. Additional safety information LI-7820 N₂O/H₂O Gas Analyzer...

  • Page 85: Appendix C. Specifications

    Warmup (Universal power adapter or 24 VDC power supply, pins 1 and 5): Up to 140 Watts with batteries charging Power Supply: Universal power adapter (Input: 100 to 240 VAC, 50 to 60 Hz; Out- put: 24 VDC) Battery Life: 8 hours typical with 2 batteries Pollution Degree: 2 LI-7820 N₂O/H₂O Gas Analyzer...
  • Page 86 45 ppm at 10,000 ppm with 1 second averaging 20 ppm at 10,000 ppm with 5 second averaging Figure C-1. LI-7820 dimensions. Clearance is required for the power cable and tubing, as well as 2 to 3 cm around the case vents.

  • Page 87: Appendix D. Warranty

    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 88 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 89 Appendix E. Index air filter, 6-4 data air inlet, 1-2 retrieving, 3-4 alarms, 4-15 data files auto sync about, 3-4 clock, 4-6 DHCP, 4-7 dimensions, C-2 display panel, 2-8 downloading data, 3-4 backpack kit, 1-5 dry-down chemical, 6-5 batteries, 2-2 about, 1-3 charging, 2-2 disposal, B-4...
  • Page 90 4-8 residual, 4-12 ring down time, 4-13 zero calibration, 4-10 RJ-45 connector, 1-2 safety labels laser, B-1 SD card error message, 2-9 serial number, 2-8 set IP address automatically, 4-7 settings, 4-11 shipping the instrument, 2-11 LI-7820 N₂O/H₂O Gas Analyzer...
  • Page 92 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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