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Section 4. Theory of Operation

System Overview..........................................................................................................................................................................

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Optical Bench System ..................................................................................................................................................................

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Section 5. Maintenance

Cleaning the Optical Bench ..........................................................................................................................................................

5-1

Changing the Optical Bench ........................................................................................................................................................

5-5

Changing the Fuse ........................................................................................................................................................................

5-7

Appendix A. Specifications
Appendix B. Pin Assignments
Appendix C. List of Suppliers
Warranty

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Содержание LI-800

Страница 1: ...CO CO CO2 Analyzer Analyzer Analyzer Environmental Division Instruction Manual ...

Страница 2: ...CO2 Analyzer ...

Страница 3: ...photocopied reproduced or translated to another language without prior written consent of LI COR Inc Copyright 1998 LI COR Inc Publication Number 9810 123 Printing History New editions of this manual will incorporate all material since the previous editions Update packages may be used between editions which contain replacement and additional pages to be merged into the manual by the user The manua...

Страница 4: ...iii Table of Contents Section 1 General Description What s What 1 1 Features 1 3 Precautions 1 3 Getting Started Tutorial 1 4 Section 2 Power On Power On 2 1 Low Battery Indicator 2 1 Alarms 2 2 ...

Страница 5: ... 3 7 Controls 3 8 Enable Heater 3 8 Pressure Compensation 3 8 DAC Offset Enable 3 8 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 3 16 Plot Page 3 18 Log File Page 3 19 Analog Output 3 21 Converting Current Output to ppm CO2 3 24 Using the Terminal Strip 3 25 Connecting the GasHound to ...

Страница 6: ...em Overview 4 1 Optical Bench System 4 2 Section 5 Maintenance Cleaning the Optical Bench 5 1 Changing the Optical Bench 5 5 Changing the Fuse 5 7 Appendix A Specifications Appendix B Pin Assignments Appendix C List of Suppliers Warranty ...

Страница 7: ...ed 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 800 50 Data Communications Software This Windows 95 and Windows NT com patible software is used to communicate with your computer The software is provided on CD A complete description of this software can be found in Section 3 Operation ...

Страница 8: ...n be stored away The spare parts kit contains these items Description Qty LI COR Part No Polyurethane Mounting Feet 4 234 02268 Mounting Screws 4 149 02610 Bev a line Tubing 12 222 01824 Disposable Air Filter 2 300 01961 Quick Connect Unions 2 300 03123 1 6A Fuse 2 439 04537 Cleaning Kit includes 1 9980 013 3 Cleaning Swabs 5 610 05314 5 Cleaning Swabs 5 610 05315 O Rings 4 192 00226 Pre formed Op...

Страница 9: ...s a simple process and does not affect the instrument calibration Simple Windows software provides for easy user calibration and data output Precautions The optical bench is maintained at a constant 50 C Avoid direct exposure to sunlight or extremely high temperatures that may elevate the temperature inside the LI 800 case The optical source is sensitive to vibration and can be damaged by strong v...

Страница 10: ...utput if desired and high and low alarm output if required There are 4 jumpers inside the LI 800 case on the main circuit board two of which determine the voltage output ranges on the terminal strip position 9 and the other two which toggle the high and low alarm output between 0 5V TTL levels and an open drain condition The default jumper positions are set for 0 5V analog output and 0 5V output f...

Страница 11: ...out on the face of the terminal strip to remove it this can make it easier to connect the wires 4 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 a gender changer may be required...

Страница 12: ...into the input airstream before it enters the LI 800 Failure to do this will lead to contamination of the optical path There are some quick connect fittings in the spare parts kit that can be used on either side of the Balston filter to aid in changing the filter out Press on the red part of the fitting to release the tubing When using the LI 800 in applications where sample air is particularly di...

Страница 13: ...ir line when the instrument is not in use 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 7 Start the 800 50 PC Communications Software When you start the 800 50 program you will be asked to choose the serial port to which the LI 800 is connected The 800 50...

Страница 14: ...re the Heater is enabled checked and click OK 9 Set the analyzer zero Connect a dry CO2 free gas to the input air stream Click on the Calibrate button in the Main window Click on Zero IRGA After a few minutes a message will appear in the status bar at the bottom of the window that indicates when the IRGA is zeroed 10 Set the analyzer span Connect your span gas to the input air stream Click on Span...

Страница 15: ...pling and logging periods see Section 3 Record Window for a description of sampling and logging periods Click on the Log File tab and choose the data points to be logged Point Mean Max Min Click Save To and choose a data file name and destination Click Save Click Start to begin recording data A graph with data will appear in the window and will be logged to the file designated 12 Click Stop to clo...

Страница 16: ...s 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 Low Battery Indicator The low battery LED on the LI 800 top panel will illuminate when the battery voltage drops below 10 5 volts The LI 800 will continue to operate with a low battery there will however be a corresponding reduction in performance ...

Страница 17: ...h 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 ...

Страница 18: ...Section 2 Power On 2 3 Alarm Jumpers Voltage Output Jumpers LK1 LK2 LK5 LK3 Figure 2 1 Location of alarm jumpers LK1 and LK2 ...

Страница 19: ...ection 2 2 4 Power On 3 1 2 3 1 2 High Alarm 1 LK1 LK2 LK1 LK2 Low Alarm High Alarm Low Alarm 1 3 1 2 3 1 2 1 1 Open Drain Logic Digital 0 5V Figure 2 2 Position of jumpers for open drain and 0 5V output ...

Страница 20: ... Band 100 ppm Dead Band 100 ppm In this chart the low and high alarm values are set to 100 ppm and 1000 ppm respectively The dead band value in both alarms is set to 100 ppm When the CO2 concentration reaches 1000 ppm the high alarm is activated and remains active until the concentration drops below 900 ppm When the CO2 concentration falls below 100 ppm the low alarm is activated and remains activ...

Страница 21: ...his is useful in cases where you want to connect an audible alarm for example or a relay switch to operate another device that will raise or lower the CO2 concentration to the desired level The schematic diagram below shows how the high alarm could be connected to a relay switch that triggers an exhaust fan in a greenhouse environment These relays could also be used to trigger devices such as auto...

Страница 22: ...Inlet 12VDC Mains 120VAC 1 2 3 V GND High alarm Fan Exhaust Fan 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 ...

Страница 23: ... on CD It requires that your computer have an RS 232 serial COM interface and Windows 95 98 or Windows NT The program runs on any true PC compatible computer Installation starts when you insert the CD into your CD ROM drive If installation does not start select Run from the Windows Start menu and select the Setup exe file on the CD When the software has finished the installation procedure a progra...

Страница 24: ...device with a 25 pin serial port then a 9 pin to 25 pin adapter must be used RS 232 Output Data from the LI 800 can be transferred to a computer for analysis printing or storage using the RS 232 interface The LI 800 RS 232 port is configured as Data Terminal Equipment DTE with no hardware handshaking and is bi directional meaning information can be transferred both into and out of the LI 800 The 8...

Страница 25: ... 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 Port COM1 COM2 COM3 COM4 Select the port where the LI800 is connected Cancel OK Choose a port and click OK The following window will appear ...

Страница 26: ... H L 14 7V Configure Calibrate Record Quit IRGA ready 8 27 98 5 03 PM 851 7 ppm The Main window displays the CO2 concentration ppm as well as the status of various 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 th...

Страница 27: ... the effects of pressure fluctuations on gas density and band broadening 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 The heater is turned ON OFF in the Configuration window Filter Shows the current value for software signal...

Страница 28: ...s status of High and Low alarms whose values are set in the Configuration window Alarms are either enabled On or disabled Off Alarm Status If the alarms are enabled a red dot will be placed after the H high or L low when the alarms are activated Input Voltage Shows DC input voltage in Volts Click on the Configure button to open the Configuration window below ...

Страница 29: ...Band IRGA ready 4 27 99 5 03 PM Cancel Reset LI800 OK 10 sec 1000 100 300 100 Range of optical bench 5000 and 20000 ppm will be greyed out if 5 5 optical bench is installed Similarly 1000 and 2000 will be greyed out if 2 bench is installed Software signal filtering is available from 0 20 seconds The heater should be enabled to maintain the optical bench at a constant 50 C Pressure compensation and...

Страница 30: ...h step of the DAC is now able to resolve twice as many data points as compared to the 0 2000 ppm range which results in beter resolution Secondly the 0 1000 ppm range has a unique 4th order polynomial which provides a better curve fit and ultimately improved accuracy over this range Controls Enable Heater The Heater should be enabled to maintain the optical bench at a constant 50 C Pressure Compen...

Страница 31: ...ossible to tell from the data if negative zero offsets have occurred in the instrument To accomodate this requirement an offset can be introduced in the DAC output that allows you to identify a negative zero drift if it occurs A negative 25 ppm offset is available for the 0 1000 and 0 2000 ppm ranges and a negative 100 ppm offset is available for the 0 5000 and 0 20000 ppm ranges Thus when the DAC...

Страница 32: ...for the range selected 25 ppm for the 0 1000 or 0 2000 ppm ranges or 100 ppm for the 0 5000 or 0 20000 ppm ranges Example The voltage output jumpers are set for 0 5V output Vrange the maximum CO2 range chosen is 2000 ppm Crange and the measured output voltage V is 2 9V To calculate the CO2 concentration no offset from Equation 3 1 above CO 2 9V 2000 ppm 5V 0 2 3 2 1160 ppm To calculate the CO2 con...

Страница 33: ...the maximum values depending upon the size of the optical bench installed 2000 or 20 000 ppm and the high and low alarm and dead band values are reset to the default values Calibration polynomial coefficients are also loaded when Reset is pressed Always set the zero and span see below of the LI 800 after pressing Reset if you do not subsequent data will be erroneous Calibration Window Setting the ...

Страница 34: ...ntration Status Parameter Value Cell pressure Cell temperature Heater Filter Span Path length Alarms Alarm Status Input Voltage 485 mBar 49 9C ON 10 sec 1000ppm 5 5 in Enabled H L 14 7V Zero IRGA Span IRGA Abort Quit IRGA ready 8 27 98 5 03 PM CAL ...

Страница 35: ...zero will be set electronically and the message bar at the bottom of the window will display IRGA zeroed when finished To span connect your span gas to the input air stream Make sure the cell is purged and click on Span IRGA You will be prompted to connect the gas line and then enter the value of the span gas Span Enter span gas concentration in ppm Cancel OK After a few minutes a message will app...

Страница 36: ...ta and open and or close a log file to which the data are saved LI 800 GasHound IRGA ready 8 27 98 5 03 PM Stop Quit Start 2000 1600 1200 800 400 0 Y Axis Y Axis Max Y Axis Ticks Y Axis Grid Tick Marks Y Axis Min X Axis Sampling Plot Log File Y axis Limits 2000 0 5 There are five tabs that open other pages that allow you to set up the parameters for collecting data Each of these five pages is desc...

Страница 37: ...ect the value from the Y Axis Ticks pull down menu Click on the Y Axis Grid check box to overlay the chart with a horizontal grid Enter Y Axis Max and Min values in the Y axis Limits field Press Start at any time to view the chart layout and begin collecting data Note that you must press Stop to make changes to the chart parameters and then press Start again to resume data collection X Axis Page S...

Страница 38: ...0 800 400 0 Y Axis Plot Length X Axis Grid Tick Marks Tick Every Sampling Plot Log File 50 samples X Axis 2nd sample In the chart above 50 samples will be displayed at one time tick marks are placed every second sample After the first 50 data points are displayed the chart will scroll to show more ...

Страница 39: ...od The Logging Period is the time interval between data points logged to memory The Sample Period and Logging Period can be set to 0 5 1 5 15 30 or 60 seconds The Sample Period can not be set to a value that is greater than the Logging Period As an example if the Logging Period is set to 60 seconds and the Sample Period is set to 15 seconds 4 samples will be taken each minute and one data point wi...

Страница 40: ...Section 3 3 18 Operation LI 800 GasHound IRGA ready 8 27 98 5 03 PM Stop Quit Start 2000 1600 1200 800 400 0 Y Axis Sample Period Logging Period Plot Log File 0 5 sec X Axis 0 5 sec Sampling ...

Страница 41: ...h 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 IRGA ready 8 27 98 5 03 PM Stop Quit Start 2000 1600 1200 800 400 0 Y Axis Plot Title Graph Type Y axis Title Log File 1157 6 ppm CO2 Concentration CO2 ppm X Axis Line Sampling Plot CO2 Concentratio...

Страница 42: ...der for the file and enter a name for the file Click on the Point Mean Maximum and or Minimum check boxes to choose the type of data that are logged Note that the temperature and pressure are also logged automatically at each data point Point logs a single data point at the end of the chosen logging period Mean logs an average value for the sample data points between each logging period Maximum lo...

Страница 43: ...Section 3 Operation 3 21 LI 800 GasHound IRGA ready 8 27 98 5 03 PM Stop Quit Start 2000 1600 1200 800 400 0 Y Axis Logged Values Point Mean Maximum Minimum X Axis Sampling Plot Log File Save To ...

Страница 44: ...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 Table 3 1 shows the proper position of the jumpers for each voltage output ...

Страница 45: ...Section 3 Operation 3 23 Alarm Jumpers Voltage Output Jumpers LK1 LK2 LK5 LK3 Figure 3 1 Location of voltage output jumpers LK3 and LK5 ...

Страница 46: ...V Output LK5 1 LK3 1 0 0 5V Output To change jumper positions power the LI 800 off and remove the top cover Carefully pull straight up on the jumper s to remove and place in the desired position 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 ...

Страница 47: ...utput to ppm CO2 To convert current output I to units of ppm CO2 in your computer or other output device the following equation can be used CO C 16 I 4 C 2 range offset 3 4 where Crange is the maximum available CO2 resolution 1000 2000 5000 or 20000 ppm I is the measured current output in mA and Coffset is the CO2 offset subtracted by the software for the range selected 25 ppm for the 0 1000 or 0 ...

Страница 48: ...ng 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 The front face of the terminal strip can be removed to aid in connecting the wires pull straight out on the face to remove 1 2 3 4 5 6 7...

Страница 49: ...bel Description 1 12 30 VDC Voltage In 12 30 VDC 2 GND Ground 3 High Alarm High Alarm 4 GND Ground 5 Low Alarm Low Alarm 6 GND Ground 7 Reserved No channel 8 GND Ground 9 CO2 V Out CO2 Voltage output 10 GND Ground 11 Reserved No channel 12 GND Ground 13 CO2 4 20 mA CO2 Current output 14 GND Ground ...

Страница 50: ...and the maximum CO2 resolution available set in software at 0 1000 or 0 2000 ppm with the 5 5 optical bench or 0 5000 or 0 20000 ppm with the 2 optical bench In general the conversion takes the form CO V C V C 2 range range offset 3 6 where V is the measured voltage Crange is the maximum value of the CO2 range selected 0 to 1000 ppm 0 to 2000 ppm etc Vrange is the maximum DAC output for the select...

Страница 51: ...imum CO2 resolution 1000 2000 5000 and 20000 This multiplier can then be entered in the data logging device to convert raw voltage to CO2 values 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 CO2 range in the first column follow across to find the appropriate multiplier ...

Страница 52: ...l time and convert them into meaningful engineering units shown on the display Alternatively the LI 1400 can be configured to automatically log these data over extended periods of time and later dump the results to a computer for further analysis 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 lea...

Страница 53: ...igure V1 channel as General for CO2 3 Enter a description such as CO2 4 Set Math Poly nomial and press Ent er 5 Set description as desired a1 multiplier from Table 3 2 above a0 a2 a5 0 When finished press Esc to return to the main configuration list 6 Set Oper ator none 7 Enter a Label such as ppm for the units 8 Set Average 1 sec or as desired CO2 will now be displayed on channel V1 To log CO2 au...

Страница 54: ...fect 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 CO2 calculation and then subtracting the offset See the LI 1400 DataLogger instruction manual for instructions on using math channels ...

Страница 55: ...lters with appropriately selected bands The CO2 sample channel uses an optical filter centered at 4 24 micrometers This filter corresponds to the absorption band for CO2 Concentrations of CO2 present in the optical path will result in a reduction in IR energy as it traverses the optical path The reference channel is established using a filter with a center wavelength at 3 95 micrometers It follows...

Страница 56: ...O2 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 The source is mounted in a parabolic reflector to collimate the light and increase energy throughput down the optical path to the detector The reflector and optical path are gold plated to further increase energy transmission...

Страница 57: ...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 The thermistors are monitored as part of the control loop to determine corrections necessary in the thermal balance Two heating elements are the sources of thermal...

Страница 58: ...liter min Another key parameter in the concentration calculation is the gas temperature in the optical path It is assumed in the analyzer operation that the gas temperature will equilibrate to the optical bench temperature 50 C by the time it enters the optical path Since the instrument performs temperature and pressure corrections as part of the concentration calculation this assumption is very i...

Страница 59: ...hrough printed circuit boards mounted directly to the source and detector housings respectively The PCBs connect the main PCB to the source and detector PCBs via a ribbon cable This achieves the mechanical isolation desired for the optical bench Two optical bench variations are available depending on the concentration range necessary for the particular application The benches vary in length result...

Страница 60: ...intaining the two fold purpose stated earlier The electrical connections also support easy optical bench exchange as well as providing safe interconnection for proper operation The main PCB contains two source headers and one detector header for connection to the source and detector PCBs via the ribbon cable Combining the physical location of the two source headers with different ribbon cable leng...

Страница 61: ... 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 2 Unscrew the tube retaining nuts on the inner air port fittings Remove the tubing from both air ports Leave the tubing connected to the source and detector housings 3 There are ribbon cables Figure 5 1 below connected to the circuit boards on the source and dete...

Страница 62: ...b Bev a line Tubing Ribbon Cable Connector 4 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 Do not remove the remaining four screws ...

Страница 63: ... screws 5 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 O ring Top View End View ...

Страница 64: ...or housings use a small pair of diagonal cutters to remove the tubing from the hose barbs Use the cutters to pinch the tubing parallel to the hose barb axis and then pivot the cutters over the hose barb tip the tubing will pull off of the hose barb Be very careful not to cut the tubing or scratch the hose barb with the cutters as subsequent tubing connections may leak 9 Let the optical bench dry R...

Страница 65: ...bench and the source and detector housings 2 Install the source and detector housings on the gold plated optical path cylinder Make sure that both source and detector housings have an O ring installed as shown in Step 5 above The orientation of the cylinder is not important either end can be inserted into the source or detector housing Note There is no need to grease the O ring simply press into p...

Страница 66: ...tector Connector for 5 5 optical bench not shown beneath tubing Figure 5 1 Location of 10 pin connectors for 5 5 and 2 optical benches 4 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 ...

Страница 67: ...ing the Fuse The LI 800 power supply is protected by a 1 6A 250V 5 20 mm fast blow type fuse located inside the case If the battery fails to power the LI 800 and will not light the Power LED on the top panel check to see if the fuse has blown 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 R...

Страница 68: ... 1000 ppm 4 of reading 10 ppm 1000 20 000 ppm 4 of reading P 50 to 113 kPa 0 1000 ppm 6 of reading 10 ppm 1000 20 000 ppm 6 of reading 14 cm 5 5 Optical Bench measurement range 0 2000 ppm P 95 to 102 kPa 0 200 ppm 3 of reading 5 ppm 200 2 000 ppm 3 of reading P 50 to 113 kPa 0 200 ppm 5 of reading 5 ppm 200 2 000 ppm 5 of reading Zero Drift 1 ppm in 24 hrs at 350 ppm Specifications subject to chan...

Страница 69: ...e 1 liter minute maximum Output Signals 0 5V 0 2 5V 0 1 0V 0 0 5V 4 20 mA DAC Resolution 13 bits across specified range Power Consumption 1A 12V 12W maximum during warm up with heaters on 0 3A 12V 3 6W average after warm up with heaters on Supply Operating Range 12 30V Warm Up Time 1 5 hours Operating Temp Range 25 C to 45 C Relative Humidity Range 25 to 45 C 0 to 95 RH Non Condensing Dimensions 8...

Страница 70: ...Appendix B B 1 Pin Assignments DB 9 Connector 1 6 2 3 8 7 4 9 5 Data RXD Data TXD Signal Ground SG ...

Страница 71: ... the time of this printing In some cases the information may change without notice Soda Lime 6 12 mesh and Magnesium Perchlorate Anhydrous Mg ClO4 2 GFS Chemicals P O Box 245 Powell OH 43065 Phone 614 881 5501 FAX 614 881 5989 Toll free 800 858 9682 Soda Lime Part 66352 Mg ClO4 2 Part 49001 500g 8 water ...

Страница 72: ...Toll free 800 776 7000 Toll free FAX 800 926 1166 Soda Lime Part S201 212 LI COR Part 9960 071 Mg ClO4 2 Part M54 500 500g Thomas Scientific P O Box 99 Swedesboro NJ 08085 6099 Phone 609 467 2000 FAX 609 467 3087 Toll free 800 345 2100 Toll free FAX 800 345 5232 Soda Lime Part C703 B76 Mg ClO4 2 Part C260 M61 Dehydrite 500g ...

Страница 73: ... Relay Switches Crydom Inc 9525 Chesapeake Dr San Diego CA 92123 800 827 9366 FAX 619 715 7280 Potter Brumfield Products Div Siemens Electromechanical Components Inc 200 S Richland Creek Dr Princeton IN 47671 0001 info ae sec siemens com ...

Страница 74: ...s after LI COR inc has received written notice of the defect Unless other arrangements have been made in writing transportation to LI COR inc by air unless otherwise authorized by LI COR inc is at customer expense 5 No charge repair parts may be sent at LI COR inc s sole discretion to the purchaser for installation by purchaser 6 LI COR inc s liability is limited to repair or replace any part of t...

Страница 75: ...e of shipment to LI COR inc s authorized distributor whichever is earlier 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 su...

Страница 76: ...ntal 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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