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LI-COR LI-7825 Instruction Manual
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LI-COR LI-7825 Instruction Manual

Co2 isotope/nh3 trace gas analyzer
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LI-7825 CO
Isotope/NH
3
2
Trace Gas Analyzer
Instruction Manual

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Summary of Contents for LI-COR LI-7825

  • Page 1 LI-7825 CO Isotope/NH Trace Gas Analyzer Instruction Manual...
  • Page 3 LI-COR GmbH, Germany Siemensstraße 25A 61352 Bad Homburg Germany Phone: +49 (0) 6172 17 17 771 envsales-gmbh@licor.com envsupport-eu@licor.com LI-COR Ltd., United Kingdom St. John’s Innovation Centre Cowley Road Cambridge CB4 0WS United Kingdom Phone: +44 (0) 1223 422102 envsales-UK@licor.com envsupport-eu@licor.com...

  • Page 4: Printing History

    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 LI-COR declares that the radio equipment type LI-7825 is in compliance with Directive 2014/53/EU. LI-COR scientific products are for professional use (non-consumer products). These products do not fall within the vol- untary scopes of regulations: UNI EN ISO 14024, TCO Certified, EPEAT 2018, Blue Angel, TÜV Green Product Mark, Energy Star, EU GPP, or other similar regulations.

  • Page 6: California Proposition 65 Warning

    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 alter- ing the product, or removing the certification labels from the product.

  • Page 7: Table Of Contents

    Contents Section 1. Introduction to the LI-7825 What's what Gas analyzer Rechargeable batteries Universal power adapter Ethernet cable Accessory kit Optional accessories Reduced flow rate kit Auxiliary power cable Backpack kit Section 2. Getting started Powering on the instrument Power options...
  • Page 8 Configuration options Standard Reduced flow rate High altitude Retrieving data from the instrument Downloading a data file Components of the data file Installing the instrument in a rack mount 3-11 Section 4. Software overview Home page Indicators and buttons Remarks Graphs Settings Software...
  • Page 9 Graphed data overlaps in time or has gaps Status and warning messages Code 128 triggered Section 6. Maintenance Instrument calibration Setting the span and zero Recovering from a bad calibration Replacing the air inlet filter Replacing the purge dry-down chemical Software updates References Section 7.
  • Page 10 Index viii...

  • Page 11: Section 1. Introduction To The Li-7825

    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-7825 includes some or all of the fol- lowing components. Gas analyzer The gas analyzer is in a gray enclosure.

  • Page 12: Power Button

    Section 1. Introduction to the LI-7825 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 drawing water into the analyzer air inlet! Although equipped with software protection that...

  • Page 13: Air Outlet

    Section 1. Introduction to the LI-7825 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-7825 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-7825 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-7825 The analyzer is secured in the backpack with several straps. The bottom of the instru- ment 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

    55 °C. If starting from room temperature, it will take about 20 minutes before you can connect and another 10 or 15 minutes before it provides accurate measurements. If the instrument is very cold, it will take longer to warm up. LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 18: Power Options

    Charging batteries in the instrument Batteries in the instrument are charged any time the instrument is powered by the universal power adapter. The 10.5 to 33 VDC power terminals (pins LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 19: External Power Source

    Section 2. Getting started 3 and 4; Table 2-1 on the next page) do not charge the batteries. The charge status is given in the web interface, the instrument display, and on the battery. Charging batteries with an external charger The optional single-bay charger (part number 590-11830;...

  • 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

    (and the serial number) of your instrument. 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-7825 CO₂ Isotope/NH₃ 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-7825 CO₂ Isotope/NH₃ 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-7825 CO₂ Isotope/NH₃ 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 recommend that you remove the batteries from the case and clean and dry the instrument exter- ior with a soft damp (not dripping) cloth and mild detergent if needed.

  • Page 28: Shipping Lithium-Ion Batteries

    Figure 2-2. The blue caps and foam pad protect the inlet, outlet, and network cable con- nector during shipping. Install the caps and pad when you ship the instrument. Shipping lithium-ion batteries Many new LI-COR instruments include removable lithium-ion batteries. We recom- mend that you ship these batteries when shipping your instrument to the fact- do not ory.
  • Page 29 Section 2. Getting started declared as Dangerous Goods. One or two batteries. Shipper’s Declaration: Quantity and type of packing - Packing: 1 Fiberboard Box, Quantity: 0.46 kg weight per battery. Label package with lithium-ion battery handling label; a copy is available from licor.app.boxenterprise.net/v/Li-Ion-Shipping-Label.
  • Page 30 Section 2. Getting started CAUTION! IF DAMAGED LITHIUM ION BATTERY DO NOT LOAD OR TRANSPORT PACKAGE IF DAMAGED For more information, call 1-800-447-3576 S-14859 ULINE 1-800-295-5510 Figure 2-3. Battery handling label. 2-14 LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 31: Section 3. Using The Li-7825

    Figure 3-1. Simplified flow schematic of the gas analyzer. During a measurement, (left) air flows through the optical bench. During shutdown (right), the instrument purges the optical path of water vapor. LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 32: Connecting The Air Inlet And Outlet

    Section 3. Using the LI-7825 Check the CO zero (daily) Readings from the LI-7825 CO Isotope/NH Trace Gas Analyzer should be checked against a CO zero standard on a daily basis to ensure accurate readings. If the zero has drifted, it should be adjusted following the procedure in Setting the span and zero on page 6-2.

  • Page 33: 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-7825 to subsample a gas from a main sample line. Air passes a single time through the gas analyzer before it is discharged.

  • Page 34: Standard

    Reduced flow rate Two reduced flow rate kits have been produced for LI-COR Trace Gas Analyzers. Both kits enable the analyzer to operate at a nominal flow rate near 70 sccm, rather than the standard nominal flow rate near 250 sccm. One of the kits is required to use the configuration.
  • Page 35 Section 3. Using the LI-7825 Observe the orientation of the T-fitting. In early models, this tube comes off of the stem of the T. In later models, it comes off of the cross of the T. In either case, the tube connects the T-fitting to the pump.
  • Page 36 Section 3. Using the LI-7825 Configure the software for the low flow kit. Power on the instrument and connect to it using a computer or mobile device. The instrument will start in the standard operating mode. Starting up in the standard mode while the is installed will trigger warnings and errors;...

  • Page 37: High Altitude

    Section 3. Using the LI-7825 When prompted, click to proceed. Yes, I'm sure The instrument will restart and initialize with the reduced flow rate con- figuration. If you want to restore the normal flow rate, remove the reduced flow rate kit, change the instrument configuration to and restart.

  • Page 38: Retrieving Data From The Instrument

    Section 3. Using the LI-7825 Retrieving data from the instrument The LI-7825 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 39: Components Of The Data File

    Section 3. Using the LI-7825 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 Model...
  • Page 40 Section 3. Using the LI-7825 DATAH DATAU Description O17_DELTA ‰ Proportion of CO that has O18_DELTA ‰ Proportion of CO that has CAVITY_P Optical cavity pressure (typically near 39) CAVITY_T °C Optical cavity temperature (typically near 55) LASER_PHASE_P Laser phase pressure LASER_T °C...

  • Page 41: Installing The Instrument In A Rack Mount

    Installing the instrument in a rack mount The LI-7825 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 42 Section 3. Using the LI-7825 3-12 LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 43: Section 4. Software Overview

    Here, you can view graphs of data, download recorded data, configure the display, and alter instrument settings. Home page When you first connect to the instrument, it will display a home page with meas- urements, graphs, and options. LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 44: Indicators And Buttons

    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-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 45: 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 dis- played time range.

  • Page 46: Settings

    Section 4. Software overview Settings Click to view a menu with basic instrument settings, including Options > Settings software updates and language, instrument configuration, time, networking, Wi-Fi, and connection to peripheral instruments. LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 47: Software

    Section 4. Software overview Software Under , 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 6-8 for update instructions.

  • Page 48: Time

    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-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 49: 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 50: Wi-Fi

    If you have difficulty con- necting, try changing the channel that the instrument uses. LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 51: 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 52: 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-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 53: 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 54: 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 55: 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 is the temperature of components inside the foam insu- Thermal Enclosure Temp lating enclosure.

  • Page 56: Layouts

    Settings > Software > Check Export Data are downloaded from the instrument using the option Download under . See Retrieving data from the instrument on Options > Export page 3-8. 4-14 LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 57: Section 5. Troubleshooting

    Some iOS configurations may reject the connection and report " Unable to join the network. If your network security is managed by WiFi address, you may need to " turn off Private Wi-Fi Address or modify network settings. LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 58: Other Wireless Connection Problems

    Other wireless connection problems Try again a few times. The issue could be related to transient heavy network traffic. Some network channels may be transmitting a lot of data (like videos, for example), causing communication to time out. LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 59: Unable To Connect With The Instrument Over A Wired Connection

    Section 5. Troubleshooting Wireless networking turned off? If you are attempting to connect over wireless, be sure it is enabled in the software. The display will show a wireless network symbol ( ) when enabled. If wireless networking needs to be enabled, connect with a wired network connection and enable it.
  • Page 60 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 172.24.1.1 Device Compatible IP Addresses LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 61: Measurement Problems

    Section 5. Troubleshooting Device Compatible IP Addresses 172.24.1.2 through 172.24.1.255 Device Compatible IP Addresses LI-78xx 192.168.1.1 192.168.1.2 through 192.168.1.255 Connect with the instrument by entering the host name in a web browser address bar. Now you can change the instrument IP address settings to whatever you prefer. Connection issues will be resolved if you set both the instrument and your computer to automatic Note: You must reconnect after changing the instrument IP address.

  • Page 62: Interface Issues

    If you have been altering the time and time zone settings, the browser may receive overlapping time information. Refresh your web browser to reload the display. The issue should be resolved. Data are always logged with the Unix time. LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 63: Status And Warning Messages

    Section 5. Troubleshooting Status and warning messages During warmup and any time the instrument detects a problem, it will issue one or more status messages, including a message that says SVC Required. This is normal during warmup. Typically, warmup messages will be resolved within an hour of operation.
  • Page 64 Section 5. Troubleshooting LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 65: Section 6. Maintenance

    Section 6. Maintenance The LI-7825 will require little maintenance beyond the normal daily zero adjust- ments. 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 instru- ment or conduct any maintenance procedures other than those described here.

  • Page 66: Setting The Span And Zero

    , 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-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 67: Recovering From A Bad Calibration

    Section 6. Maintenance Switch back to the CO span gas. Wait for the reading to stabilize. Under , enter the concentration of the gas and pro- Options > Calibration > CO Span portions of isotopes: δ C, δ O, and δ O.

  • Page 68: 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-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 69: Replacing The Purge Dry-Down Chemical

    Section 6. Maintenance Replacing the purge dry-down chemical Replacement desiccant (622-17627) is included with the instrument spares. The desic- cant, consisting of silica gel beads, is contained in a non-porous tube (see Figure 6-2 below). The instrument will pump air through the desiccant tube during power-off to purge the optics of water vapor.
  • Page 70 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-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 71: Regenerating The Desiccant

    Section 6. Maintenance Regenerating the desiccant Indicating silica gel can be regenerated in a drying oven. This preparation of silica gel is green when it is saturated and orange when it is new or restored. Figure 6-3. Active and saturated desiccant. Preheat the oven to 120 °C (248 °F).

  • Page 72: Software Updates

    You can check for updates through the interface (click Settings > Software > ) or on the LI-COR technical sup- Check port website. Download the updater application and install it on your com- puter (Windows only).

  • Page 73: Section 7. Communication With The Mqtt Protocol

    Section 7. Communication with the MQTT protocol The LI-7825 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 Mos- quito, an open source MQTT broker.

  • Page 74: Basic Commands In A Terminal Program

    Section 7. Communication with the MQTT protocol Table 7-1. Topics and hierarchy in the LI-7825. 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 75: 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 76: Setting The Zero Calibration

    (up to 5 minutes). Wait until the process is finished before moving on to other com- mands. 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-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 77: Setting The Span Calibration

    CO concentration in PPB. "<CO2 tank in ppb>" This initiates the span calibration in the LI-7825. The span is implemented imme- diately. To check if the span is complete, enter the command: mosquitto_sub -h 172.24.82.42...

  • Page 78: 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-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 79: 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 80: Streaming Data Into The Terminal Program

    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-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 81: 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 82: Additional Commands

    Python scripts can be also used to set zero/span, reboot, or shutdown the instrument by using the publish option available in the Paho MQTT python client similar to mosquito_pub. To shutdown the instrument, send the command client.publish(“licor/niobrara/system/shutdown”,”shutdown”) 7-10 LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 83: Appendix A. Measurement Overview

    Figure A-1. Simplified schematic of the LI-7825 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 84 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 signal at each of cavity resonance modes. LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 85: Appendix B. Additional Safety Information

    The LI-7825 is certified as a Class I laser product. No hazardous radiation is emitted from the instrument. Any laser radiation emitted is below the Class I laser limits dur- ing all phases of user operation.
  • Page 86 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-7825 CO₂ Isotope/NH₃ Gas Analyzer...
  • Page 87 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 88: Battery Warnings And Disposal

    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-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 89: Coin-Cell Battery

    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 90 Appendix B. Additional safety information LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 91: Appendix C. Specifications

    Off: Up to 2.3 W when powered from pins 3 and 4 without batteries charging; up to 0.2 W when powered from pins 1 and 5 without batteries charging Power Supply Requirements: Pins 1 and 5 (24 VDC Input): Minimum 6 A at 24 V LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...
  • Page 92 Precision (1σ): 2 ppb at 300 ppb with 1 second averaging Response Time (T ): ~5 minutes O Measurements Range: 0 to 60,000 ppm measurement response time is dependent upon gas composition and inlet pneumatic configuration including tubing/fitting materials, flow rates, and upstream volumes. LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...
  • Page 93 20 ppm at 10,000 ppm with 5 second averaging Dimensions Figure C-1. LI-7825 dimensions. Clearance is required for the power cable and tubing, as well as 2 to 3 cm around the case vents. Specifications subject to change without notice.
  • Page 94 Appendix C. Specifications LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...

  • Page 95: Standard Terms And Conditions

    Buyer will be deemed to have assented to these Conditions upon Buyer’s placement of order. Notwithstanding the above, failure of LI-COR to object to provisions contained in any purchase order or other form or document from Buyer shall not be construed as a waiver of these Conditions nor an acceptance of any such provision.
  • Page 96 INCOTERMS 2000 designated by LI-COR. LI-COR title to the Products and the risk of loss of or damage to the Products ordered by the Buyer will pass to Buyer at time of LI-COR delivery of Products to the carrier. The carrier shall be deemed Buyer’s agent, and any claims for damages in shipment must be filed with the carrier.
  • Page 97 LI-COR. LI-COR may assign or transfer these Conditions to any successor by way of mer- ger, acquisition or sale of all or substantially all of the assets relating to these Conditions. LI-COR or any successor may assign all or part of the right to payments under these Conditions.
  • Page 98 LI-COR suppliers or subcontractors, transportation difficulties, customs clearance, shortage of energy, raw materials or equipment, or Buyer’s fault or negligence. In the event of any such delay the date of delivery shall, at the request of LI-COR, be deferred for a period equal to the time lost by reason of the delay.
  • Page 99 Index connecting, 2-4 local area network, 2-6 air filter, 6-4 wireless, 2-5 air inlet, 1-2 connecting a sample, 3-3 alarms, 4-14 connecting an air supply, 3-2 auto sync connection issues, 5-2, 5-3 clock, 4-6 data backpack kit, 1-5 exporting, 3-8 batteries, 2-2 retrieving, 3-8 about, 1-3...
  • Page 100 2-2 thermal enclosure temperature, 4-13 powering on, 2-1 thresholds, 4-14 powering on and off, 1-2, 2-10 time precision time protocol, 4-7 unix epoch, 3-10 PTP, 4-7 timezone, 3-9, 3-10 purge, 6-5 troubleshooting, 5-1 LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...
  • Page 101 Index warnings, B-1 water warning, 1-2 Wi-Fi, 2-7, 4-8, B-3 Wi-Fi status, 2-8 wireless communication, B-3 wireless networking, 4-8 zero calibration, 4-10 Index...
  • Page 102 Index LI-7825 CO₂ Isotope/NH₃ Gas Analyzer...
  • Page 104 LI-COR GmbH, Germany Siemensstraße 25A 61352 Bad Homburg Germany Phone: +49 (0) 6172 17 17 771 envsales-gmbh@licor.com envsupport-eu@licor.com LI-COR Ltd., United Kingdom St. John’s Innovation Centre Cowley Road Cambridge CB4 0WS United Kingdom Phone: +44 (0) 1223 422102 envsales-UK@licor.com envsupport-eu@licor.com...