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LI-COR LI-800 Instruction Manual

Co2 analyzer
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Instruction Manual
Environmental Division
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Summary of Contents for LI-COR LI-800

  • Page 1 Analyzer Analyzer Analyzer Instruction Manual ® Environmental Division...
  • Page 2 Analyzer...
  • Page 3 The information contained in this document is subject to change without notice. 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 4: Table Of Contents

    Table of Contents Section 1. General Description What’s What....................................Features ......................................Precautions ....................................Getting Started Tutorial ................................Section 2. Power On Power On ...................................... Low Battery Indicator .................................. Alarms ......................................
  • Page 5 Controls ....................................Enable Heater ................................. Pressure Compensation ..............................DAC Offset Enable ................................ Span ....................................... 3-10 Reset LI-800 ..................................3-10 Calibration Window - Setting the Zero and Span......................... 3-11 Record Window - Plotting Data ..............................3-13 Y-Axis Page................................... 3-14 X-Axis Page................................... 3-14 Sampling Page ..................................
  • Page 6 Section 4. Theory of Operation System Overview..................................Optical Bench System .................................. Section 5. Maintenance Cleaning the Optical Bench ................................Changing the Optical Bench ................................ Changing the Fuse ..................................Appendix A. Specifications Appendix B. Pin Assignments Appendix C. List of Suppliers Warranty...

  • Page 7: Section 1. General Description

    What's What This procedure should be followed if you have just taken delivery of your LI-800. Check the packing list to verify that you have received everything that was ordered and that you have also received the following items: RS-232 Cable - (Part #392-04993), used to connect the LI-800 to your computer.
  • Page 8 Standard Spare Parts Kit (9980-012) - This kit contains replacement parts for your LI-800. As you become familiar with the analyzer you will learn which items to keep close at hand and which items can be stored away. The spare parts kit contains these...

  • Page 9: Features

    The LI-800 is an economical high performance, non-dispersive infrared gas analyzer designed to be used for a wide variety of applications. Some of the LI-800's important features include: Optional short (2") and standard long (5.5") interchangeable optical benches can be used to obtain resolutions of 0-20000 ppm and 0-2000 ppm, respectively.

  • Page 10: Getting Started Tutorial

    Install the 800-50 PC Communications Software. This software is required for setting the zero and span of the LI-800 and for setting up data communication and data transfer parameters. Installation instructions can be found in Section 3, Installing the Software on Your Computer.
  • Page 11 Connect the RS-232 cable. Connect one end of the serial cable to the 9-pin Serial I/O port on the LI-800 front panel, and the other end to a serial port on your computer. If you want to interface to a device with a 25- pin serial port, a 9-pin to 25-pin adapter must be used;...
  • Page 12 FLOW IN port on the LI-800. IMPORTANT: Always install the external air filter before operating the LI-800. Insert filter into the input airstream before it enters the LI-800. Failure to do this will lead to contamination of the optical path.
  • Page 13 This will prevent dust from entering the instrument downstream from the filters where it can enter the optical path. Replacement Balston air filters can be obtained from LI-COR (part #300-01961). Start the 800-50 PC Communications Software.
  • Page 14 Section 1 Configure the analyzer. Click on the button in the Main window. Select the CO range (the 'Span' buttons) Configure over which you will be measuring CO . Choose a value for signal averaging, between 0 and 20 seconds. Set values for high and low alarms and corresponding dead bands, if desired. See Section 2 for a complete description of the alarms.
  • Page 15 Section 1 Set up the data collection parameters. Click on the button in the Main window. Click on the Y-Axis, X-Axis, and Plot tabs Record to set up the parameters for displaying data on screen, if desired. Click on the Sampling tab and choose sampling and logging periods (see Section 3, Record Window, for a description of sampling and logging periods).

  • Page 16: Section 2. Power On

    Power On Power On The LI-800 can be connected to a constant source of AC power by using a transformer that provides 12-30VDC (12W minimum) to the LI-800. If the LI-800 is powered On with a battery below 10.5 volts, the analyzer will not power up, and the Low Battery LED on the top panel will illuminate.

  • Page 17: Alarms

    Section 2 Alarms The LI-800 is equipped with high and low alarms, which can be configured as open collector or 0-5V output (TTL levels) using jumpers on the main PC board (Figure 2-1). The default configuration is 0-5V output. Figure 2-2 shows the position of the jumpers for each of the two alarm conditions.
  • Page 18 Section 2 Alarm Voltage Jumpers Output Jumpers Figure 2-1. Location of alarm jumpers LK1 and LK2. Power On...
  • Page 19 Section 2 Open Drain Logic (Digital, 0-5V) Figure 2-2. Position of jumpers for open drain and 0-5V output. Power On...
  • Page 20 Section 2 In addition, a "dead band" value can be set in software for both high and low alarms. To understand how the alarms and dead band values work, look at the diagram below. High Alarm activated 1000 High Alarm = 1000 Dead Band = 100 ppm High Alarm deactivated Low Alarm...
  • Page 21 Note: Increasing the signal average value in software can help reduce fluctuations in readings. Alarm LEDs can be viewed on the top panel of the LI-800. Terminals 3 and 5 on the terminal strip are also connected to the High and Low alarms, respectively. This is useful in cases...
  • Page 22 Section 2 Air Inlet LI-800 1 2 3 Mains 120VAC Exhaust Input 3 - 30V 12VDC Output A list of suppliers of electronic relay switches can be found in Appendix C. NOTE: Consult your local electrical codes before wiring, and/or have a professional electrician wire your application.

  • Page 23: Installing The Pc Communications Software On Your Computer

    Programs menu. ® 800-50, Version 1.3 For Windows® 95/98/NT © LI-COR, inc. 1998 NOTE: To remove the software, go to the Control Panel and select Add/Remove Programs. Choose LI800 from the list of programs and click the Add/Remove button. Operation...

  • Page 24: Setting The Communication Parameters

    The serial cable included has 9-pin connectors on both ends; either end plugs into the 9-pin connector (Serial I/O) on the front panel of the LI-800. Use this cable to interface with devices such as computers, serial printers, and terminals with 9-pin serial ports. If you want to interface to a device with a 25-pin serial port, then a 9-pin to 25-pin adapter must be used.

  • Page 25: Initial Setup

    Section 3 Initial Setup Double-click on the LI-800 program icon to start the program. You will be asked to select the serial port to which the LI-800 is connected. LI-800 GasHound LI-800 GasHound Select the port where the LI800 is connected...
  • Page 26 LI-800 parameters. There are also three buttons that open additional windows used to configure the LI-800, perform zero and span calibrations, and set up the parameters for recording data. The status bar at the bottom of the window shows the current date and time...
  • Page 27 Cell Temperature Temperature (°C) in the LI-800 optical cell. This value should remain near 50 °C when the heater is turned ON. Heater Shows status of heater (ON/OFF), which is used to maintain the optical cell at a constant 50 °C.
  • Page 28 Section 3 Parameter Description Path Length Shows the size of the optical bench installed in the LI-800, either 5.5 inches, or 2 inches. Alarms Shows status of High and Low alarms, whose values are set in the Configuration window. Alarms are either enabled (On), or disabled (Off).

  • Page 29: Configuration Window - Setting Operational Parameters

    Section 3 Configuration Window - Setting Operational Parameters The Configuration window contains parameters related to initial setup of the LI-800, including the resolution of the optical bench, signal filtering, high and low alarm setup, and controls. LI-800 GasHound Disable the...

  • Page 30: Controls

    Span The span (range) buttons determine the maximum CO range over which the LI-800 will make measurements. If the 5.5" optical bench is installed, 5000 ppm and 20000 ppm will be greyed out. Similarly, if the 2" optical bench is installed, 1000 ppm and 2000 ppm will be greyed out.

  • Page 31: Dac Offsetenable

    DAC OffsetEnable The DAC Offset Enable check box determines whether the analog output voltage includes a zero offset. The DAC in the LI-800 is unipolar, meaning that only positive analog values are output, even if the apparent CO mole fraction as displayed by the Windows® software reads negative.
  • Page 32 Section 3 where V is the measured voltage, C is the maximum value of the CO range selected (0 to range 1000 ppm, 0 to 2000 ppm, etc.), V is the maximum DAC output for the selected range (0- range 5V, 0-2.5V, 0-1V, 0-0.5V), and C is the CO offset subtracted by the software for the...

  • Page 33: Reset Li-800

    Section 3 Reset LI-800 The Reset button is used to set the LI-800 parameters back to the default values. Zero and span values are set to 1, alarms are set to Off, the heater is enabled, pressure compensation is disabled, and the DAC offset is reset to zero. In addition, the software signal filtering is set to...
  • Page 34 Section 3 LI-800 GasHound Concentration: Status: Parameter: Value: Zero IRGA Cell pressure 485 mBar Cell temperature 49.9C Heater Span IRGA Filter 10 sec. Span 1000ppm Abort Path length 5.5 in. Alarms Enabled Alarm Status Quit Input Voltage 14.7V IRGA ready.
  • Page 35 It is recommended that you perform the zero calibration first, followed by the span calibration. To zero, flow a dry, CO -free gas through the LI-800, and make sure the optical cell is completely purged. Press the button. The display will show zero. The zero...

  • Page 36: Record Window - Plotting Data

    Main window to open the Record window (below). This is Record the window in which you can set up the parameters for plotting your data, and open and/or close a log file to which the data are saved. LI-800 GasHound 2000 1600 1200...

  • Page 37: Y-Axis Page

    Section 3 Y-Axis Page Sets chart parameters for Y-axis. Tick marks can be placed on the Y-axis in increments from 1 to 10. The tick marks will be placed at equally spaced intervals along the Y-axis, depending upon the values chosen for the Max and Min. In the chart above, when a value of 5 is chosen for the Y-Axis Ticks, and the Y-Axis Max is set to 2000, the tick marks are placed every 400 ppm.
  • Page 38 Section 3 LI-800 GasHound 2000 1600 1200 Y-Axis X-Axis Sampling Plot Log File Start Plot Length: Tick Marks 50 samples Stop Tick Every: X-Axis Grid 2nd sample Quit IRGA ready. 8/27/98 5:03 PM In the chart above, 50 samples will be displayed at one time; tick marks are placed every second sample.

  • Page 39: Sampling Page

    Section 3 data. The Plot Length can be selected for 10, 20, 50, 100, 200, or 500 samples; note that at higher values, however, individual data points may be difficult to discern. Sampling Page The Sample Period is the time interval between samples within a Logging Period. The Logging Period is the time interval between data points logged to memory.
  • Page 40 Section 3 LI-800 GasHound 2000 1600 1200 Y-Axis X-Axis Sampling Plot Log File Start Sample Period: Logging Period: Stop 0.5 sec. 0.5 sec. Quit IRGA ready. 8/27/98 5:03 PM 3-18 Operation...

  • Page 41: Plot Page

    A line graph can be plotted (below), in which data points are connected with a continuous line, or a symbol graph can be selected, where each data point is represented with a symbol. The current data value is shown in the upper righthand corner of the plot window. LI-800 GasHound 1157.6 ppm CO2 Concentration...

  • Page 42: Log File Page

    Section 3 Log File Page The Log File page allows you to choose the type of data point(s) that are collected at the end of each logging period (point, mean, maximum, minimum), and to choose a name and desti- nation for the data file. Click on the button to bring up the Open dialog box, where Save To you can select a drive and folder for the file, and enter a name for the file.
  • Page 43 Section 3 LI-800 GasHound 2000 1600 1200 Y-Axis X-Axis Sampling Plot Log File Start Logged Values: Point Stop Mean Save To: Maximum Quit Minimum IRGA ready. 8/27/98 5:03 PM Operation 3-21...

  • Page 44: Analog Output

    Section 3 Analog Output Analyzer output can be recorded by connecting a logging device to the terminal strip on the front of the analyzer. Output is linear, and is selectable at 0-5V, 0-2.5V, 0-1V, or 0-0.5V. Voltage output is selected using two jumpers on the main PC board, at locations LK3 and LK5, as shown in Figure 3-1 below.
  • Page 45 Section 3 Alarm Voltage Jumpers Output Jumpers Figure 3-1. Location of voltage output jumpers LK3 and LK5. Operation 3-23...
  • Page 46 Reassemble the case. Voltage output is measured by attaching the positive lead from the logging device to terminal 9 (CO2 V Out) on the LI-800 terminal strip. Connect the negative lead to position 10, (GND). 3-24 Operation...

  • Page 47: Converting Current Output To Ppm Co

    Section 3 Current output can be measured by connecting the positive input of the data logging device to position 13 (CO2 4-20 mA), and the negative input to position 14 (GND). The current output at position 13 is non-isolated, and is rated to drive a 250 ohm load. Converting Current Output to ppm CO To convert current output (I) to units of ppm CO in your computer or other output device, the...

  • Page 48: Using The Terminal Strip

    = 1531.25 ppm. Using the Terminal Strip The terminal strip is located on the front panel of the LI-800. To connect the wires, insert the bare wire end into the appropriate terminal and tighten the screw above that terminal using the small flat head screwdriver in the spare parts kit.
  • Page 49 Section 3 The terminal positions are as follows, reading left to right: Terminal Label Description 12-30 VDC Voltage In, 12-30 VDC Ground High Alarm High Alarm Ground Low Alarm Low Alarm Ground Reserved No channel Ground CO2 V Out Voltage output Ground Reserved No channel...

  • Page 50: Connecting The Gashound To The Li-1400 Datalogger

    Section 3 Connecting the GasHound to the LI-1400 Datalogger The following example shows how you can connect the LI-800 to a datalogging device such as the LI-COR Model LI-1400 DataLogger to collect analog data and convert to meaningful values. As mentioned earlier, voltage output from the LI-800 is linear; converting analog...
  • Page 51 Table 3-2 lists the appropriate values for this multiplier; simply choose your DAC output range (see Section 3, Analog Output), in the second row, and then select the LI-800 maximum CO range in the first column; follow across to find the appropriate multiplier.
  • Page 52 Access to the voltage channels require the 1400-301 Terminal block. Voltage channels are designated by the letter “V” and sequentially numbered V1-4. The lead from LI-800 terminal #9 should be attached to one of the LI-1400 terminals labeled V1, V2, V3, or V4, while the lead from terminal #10 should be attached to one of the LI-1400 terminals labeled ↓.
  • Page 53 Section 3 The following example shows how you can set up the LI-1400 Data Logger to collect raw voltage output from the LI-800 and convert to CO values (DAC Offset disabled). Set the voltage output jumpers for 2.5V output as described in Section 3, Analog Output.
  • Page 54 Section 3 To capture the minimum and maximum CO values, set MinMax accordingly. TCoef has no effect when Calc=Mean. It is used only when integrating. This example could be modified to subtract a DAC Offset value of 25 ppm or 100 ppm using a math channel to store the value of the CO calculation, and then subtracting the offset.

  • Page 55: Section 4. Theory Of Operation

    Theory of Operation System Overview The LI-800 CO Gas Analyzer is an absolute, non-dispersive, infrared (NDIR) gas analyzer based upon a single path, dual wavelength, infrared detection subsystem. The CO measure- ment is a function of the absorption of IR energy as it travels through the optical path.

  • Page 56: Optical Bench System

    Optical Bench System The LI-800 CO Gas Analyzer optical path is a thermostatically controlled IR detection system. The optical bench operation is based upon a broad band IR source and a pyroelectric detector.
  • Page 57 Source PCB Detector PCB Figure 4-1. Schematic diagram of LI-800 optical bench. The optical bench has a thermostat that maintains a constant operating temperature of 50 °C. A feedback loop is used to regulate the optical bench temperature. As shown in Figure 4-1, two thermistors, located in the source and detector housings, measure the present temperature.
  • Page 58 Section 4 The bench requires approximately 10 minutes to achieve the specified thermal temperature. A longer period of approximately 1.5 hours is required to bring the performance of the detection system to within 1 to 2% of reading. As shown in Figure 4-1, the detector housing has a pressure transducer integrated into the housing design.
  • Page 59 Section 4 the case by creating the s-bend in the Bev-a-line tubing from the external fittings to the optical bench gas inlet and outlet connectors. The electronic interface to the source and detector is achieved through printed circuit boards mounted directly to the source and detector housings respectively.
  • Page 60 Section 4 14 cm (5.5”) Optical Bench 0 – 1000 ppm 0 – 2000 ppm 5 cm (2”) Optical Bench 0 – 5000 ppm 0 – 20000 ppm The ease of interchangeability for the optical bench options was a consideration from the beginning of the analyzer design.

  • Page 61: Section 5. Maintenance

    Follow these steps to clean the optical bench: Turn the LI-800 off. Remove the six screws on the LI-800 top panel and remove the cover. Note that these screws are not molded into the case and may fall out.
  • Page 62 Section 5 Detector Source Optical Bench Hose Barb Ribbon Cable Bev-a-line Tubing Connector Air In Air Out There are four screws on the source and detector circuit boards that must be removed. Remove the four screws in the corners of the boards, as shown below (they are slightly larger than the other four screws).
  • Page 63 Section 5 Remove these 4 screws The source and detector housings (with attached circuit boards) can now be removed. The bench will appear as shown below. It is a good practice to replace the O-rings when cleaning or replacing the optical path. Top View End View O-ring...
  • Page 64 Note that the orientation of the cylinder is not important; either end can be inserted into the source or detector housing. Re-assemble the LI-800 case. Make sure that the foam insulation on the inside top cover is positioned over the optical bench; it is required for thermal stability.

  • Page 65: Changing The Optical Bench

    Section 5 Changing the Optical Bench The 14 cm (5.5") and 5 cm (2") optical benches of the LI-800 can be interchanged to provide measurements of 0-2000 and 0-20000 ppm, respectively. The LI-800 will automatically sense which optical bench is installed; no further software or hardware switches are required.
  • Page 66 Section 5 Source Detector LEDs Connector for 5.5" optical bench (not Connector for 2” Fuse shown, beneath optical bench tubing) Figure 5-1. Location of 10-pin connectors for 5.5" and 2" optical benches. Install the new bench in the same orientation as the existing bench, with the source side on the left as you face the front of the instrument.

  • Page 67: Changing The Fuse

    To check the fuse, remove the six screws on the top of the LI-800. The fuse is located on the main circuit board, near the Flow In port, as shown in Figure 5-1. Replacement fuses (part #439-04537, in the spares kit) plug into the fuse holder;...

  • Page 68: Appendix A. Specifications

    Specifications* Measurement Range: 0 – 1000 ppm, 0 – 2000 ppm 0 – 5000 ppm, 0 – 20000 ppm Measurement Principle: Non-Dispersive Infrared Accuracy: 5 cm (2") Optical Bench (measurement range 0 - 20000 ppm): P = 95 to 102 kPa 0 - 1000 ppm;...
  • Page 69 Appendix A Signal Noise: 3.0 ppm pk-pk noise @ 350 ppm (1 sec signal averaging) 1.0 ppm pk-pk noise @ 350 ppm (20 sec signal averaging) Span Drift: < 3 ppm in 24 hrs at 350 ppm Pressure Compensation Range: 150 mbars - 1150 mbars Maximum Gas Flow Rate: 1 liter/minute maximum Output Signals: 0 –...

  • Page 70: Appendix B. Pin Assignments

    Pin Assignments DB-9 Connector Data (RXD) Data (TXD) Signal Ground (SG) Appendix B...
  • Page 71 Suppliers 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. Soda Lime (6-12 mesh) and Magnesium Perchlorate (Anhydrous) Mg(ClO GFS Chemicals P.O.
  • Page 72 Appendix C Fisher Scientific 711 Forbes Avenue Soda Lime: Part #S201-212 Pittsburgh, PA 15219-4785 (LI-COR Part #9960-071) Phone: 201-467-6400 FAX: 201-379-7415 Mg(ClO : Part #M54-500 (500g) Toll free: 800-776-7000 Toll free FAX: 800-926-1166 Thomas Scientific P.O. Box 99 Soda Lime: Part #C703-B76...
  • Page 73 Appendix C Electronic Relay Switches Crydom Inc. Potter & Brumfield Products Div. 9525 Chesapeake Dr. Siemens Electromechanical San Diego, CA 92123 Components, Inc. 800-827-9366 200 S. Richland Creek Dr. FAX: 619-715-7280 Princeton, IN 47671-0001 info@ae.sec.siemens.com Appendix C...

  • Page 74: Warranty

    1. 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 75 This warranty supersedes all warranties for products purchased prior to June 1, 1984, unless this warranty is later superseded. DISTRIBUTOR or the DISTRIBUTOR'S customers may ship the instruments directly to LI-COR if they are unable to repair the instrument themselves even though the DISTRIBUTOR has been approved for making such repairs and has agreed with the customer to make such repairs as covered by this limited warranty.
  • Page 76 ® LI-COR, inc. Environmental Division 4421 Superior Street P.O. Box 4425 Lincoln, Nebraska 68504 USA Phone: 402-467-3576 FAX: 402-467-2819 Toll-free 1-800-447-3576 (U.S. & Canada) E-mail: envsales@env.licor.com Internet: http://www.licor.com...

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