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LI-840A

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O GAS ANALYZER

Instruction Manual

Summary of Contents for LI-840/A

Page 1: ...LI 840A CO2 H2O GAS ANALYZER Instruction Manual...

Page 2: ......

Page 3: ...LI 840A CO2 H2O Analyzer Instruction Manual...

Page 4: ...has been tested and found to comply with the limits for a Class A computing device pursuant to Subpart J of Part 15 of FCC rules which are designed to provide a reasonable pro tection against such int...

Page 5: ...rmity Manufacturer s Name LI COR Inc Manufacturer s Address 4647 Superior Street Lincoln Nebraska USA 68504 This declaration of conformity is issued under the sole responsibility of the manufacturer P...

Page 6: ...ed to another language without prior written consent of LI COR Inc Copyright 2010 2016 LI COR Inc Publication Number 984 10690 Printing History April 2010 January 2011 Updated May 2013 May 2015 June 2...

Page 7: ...1 Features 1 3 Precautions 1 3 Getting Started Tutorial 1 4 Section 2 Power On Alarms 2 1 Section 3 Operation Installing the PC Communication Software on Your Computer 3 1 Setting the Communication P...

Page 8: ...8 CO2 Span Range 3 13 Alarms 3 13 Using the Terminal Strip 3 14 Software Reference 3 16 Charting Window 3 16 Series 1 3 17 Series 2 3 17 X Axis Max 3 17 Diagnostic Window 3 18 Logging Data 3 19 Start...

Page 9: ...Connecting the LI 840A to the LI 1400 Datalogger 3 32 Section 4 Theory of Operation System Overview 4 1 Optical Bench System 4 2 Section 5 Maintenance Cleaning the Optical Bench 5 1 Changing the Fuse...

Page 10: ...Appendix B Equation Summary Appendix C Pin Assignments Appendix D Suppliers Appendix E Configuration Grammar Element Descriptions E 15...

Page 11: ...is cable is a null modem cross over type cable a straight through type cable will not work with the LI 840A Appendix C shows the pin assignments for the DB 9 connector on the LI 840A front panel An RS...

Page 12: ...Description Qty LI COR Part No Spares Kit 1 9980 021 Polyurethane Mounting Feet 4 234 02268 Mounting Screws 4 149 02610 Terminal Block 1 331 05273 Bev a line Tubing 12 222 01824 Gelman Air Filter 2 99...

Page 13: ...ovides for easy user calibration and data output Precautions l Avoid storing the LI 840A in humid conditions while powered off Doing so can cause the optical sensor to become saturated with humidity w...

Page 14: ...communication and data transfer parameters for viewing and logging data Installation instructions can be found in Installing the PC Communication Software on Your Computer on page 3 1 2 Determine you...

Page 15: ...ain of 1 2A at 12 VDC After the instrument has warmed up it will draw about 0 3A at 12 VDC with the heaters on 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Bare wire leads are connected to the terminal strip at p...

Page 16: ...utput devices such as dataloggers and relay switches for high and low alarms are connected via the terminal strip A complete description of the terminals can be found in Section 3 Using the Terminal S...

Page 17: ...ilter Gelman or Balston Part 9967 008 I N 1 m P T F E I N NOTE More information about plumbing options and parts available from LI COR can be found in Application Note IRG4 105 entitled Air Pumps and...

Page 18: ...N 1 m P T F E I N Air In Air Out When using the LI 840A for applications where sample air is particularly dirty you may con sider stacking two filters in series For maintenance replace the filter fur...

Page 19: ...igure the analyzer Select Settings from the View menu The Settings window appears Choose a value for signal averaging the Filter field between 0 and 20 seconds Set values for high and low alarms and c...

Page 20: ...If the instrument needs to be calibrated follow the steps below Connect a dry CO2 free gas to the input air stream Select Calibration from the View menu Click on the Zero tab Click the Zero CO2 Wait...

Page 21: ...erator Enter the dew point value of the H2O span gas in degrees C and click on Span H2O Connect a second span gas with a known concentration of CO2 to the input air stream If the reading is not within...

Page 22: ...13 Set up the charting parameters if desired Select Charting from the View menu Enter the value to be plotted the Y Axis min and max val ues X Axis max and time units to be displayed on each plot Cli...

Page 23: ...e to operate with a low battery there will however be a cor responding reduction in performance Alarms The LI 840A is equipped with high and low alarms which can be configured as open collector or 0 5...

Page 24: ...Figure 2 1 Location of alarm jumpers LK1 and LK2 Section 2 2 2 Section 2 Power On...

Page 25: ...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 2 3 Section 2 Power On Se...

Page 26: ...pm 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 al...

Page 27: ...ely This is useful for connecting 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 bel...

Page 28: ...V GND High alarm Fan Exhaust Fan A list of suppliers of electronic relay switches can be found in Appendix D NOTE Consult your local electrical codes before wiring and or have a professional elec tri...

Page 29: ...drive Select Install Software from the menu and follow the instructions If installation does not start select Run from the Windows Start menu and select the LI840Setup exe file on the CD When the sof...

Page 30: ...n serial port a 9 pin to 25 pin adapter must be used To connect to a computer with a USB port a 9 pin serial to USB adapter must be used RS 232 Output Data from the LI 840A can be transferred to a com...

Page 31: ...ar beneath the File menu You are asked to select the serial port to which the LI 840A is connected and the output interval at which data are output 0 5 to 20 seconds in 0 5 second increments Choose a...

Page 32: ...ration C or mmol mol cell temperature and pressure and the status of various LI 840A parameters There are also three menus used to configure the LI 840A perform zero and span calibrations and set up t...

Page 33: ...Pressure Barometric pressure kPa measured in the LI 840A optical cell This value can be used to correct measurements for the effects of atmo spheric pressure Output Rate Displays data output rate cho...

Page 34: ...20 seconds DAC Output Displays source channels for DAC1 and DAC2 and the voltage out put range 0 2 5V or 0 5V PC Logging Shows Off if data are not being logged to a file or Logging when data are bein...

Page 35: ...rs related to initial setup of the LI 840A including signal filtering high and low alarm setup heater and pressure compensation options and DAC output sources Choose Settings from the View menu or cli...

Page 36: ...The filter can be set from 0 no signal averaging to 20 seconds Note that increasing the filter decreases instrument noise but reduces the response time DAC Output Analyzer output for up to 2 values no...

Page 37: ...ct the negative lead to position 10 GND or position 8 GND The CO2 or H2O concentration can be calculated from the DAC output voltage as follows 3 1 where V is the measured voltage XF is the full scale...

Page 38: ...e V is the measured voltage XF is the full scale value for H2O output entered in the Set tings Window as the 2 5 or 5V value up to 60 parts per thousand XZ is the zero value entered and Vmax is the fu...

Page 39: ...to Cell Temperature Cell temperature can be calculated from the DAC output voltage as follows 3 7 where V is the measured voltage XF is the full scale value for temperature output entered in the Setti...

Page 40: ...ion 12 or 14 GND The current output at positions 11 and 13 is non isolated and is rated to drive a 250 ohm load Note These channels mirror their respective voltage output channels current output chann...

Page 41: ...over which the LI 840A will make measurements The factory calibration range for the LI 840A is 0 20 000 ppm Note that there is a benefit to selecting a narrower range if that range is adequate for yo...

Page 42: ...e of the terminal strip can be removed to aid in connecting the wires by pulling straight out on the face 1 2 3 4 5 6 7 8 9 10 11 12 13 14 The terminal positions are as follows reading from left to ri...

Page 43: ...Terminal Label Description 11 4 20 mA 2 Current output channel 2 12 GND Ground 13 4 20 mA 1 Current output channel 1 14 GND Ground 3 15 Section 3 Operation Section 3...

Page 44: ...from the View menu to open the Charting window below This is the window in which you can set up the parameters for plotting your data Two charts can be plotted sim ultaneously using Y axes on either s...

Page 45: ...is on the right side of the chart Choose the value to be logged and set the maximum and minimum values for the Y axis X Axis Max Sets the maximum value for the X axis Time The units for the X axis can...

Page 46: ...t Diagnostics from the View menu to open the Diagnostics window below This window displays the current LI 840A internal software version number the input voltage and raw absorp tion values Section 3 3...

Page 47: ...Logging Data Start Logging Opens the Log File Destination dialog where you enter a file name for the data file The file extension txt is added automatically 3 19 Section 3 Operation Section 3...

Page 48: ...Stop Logging Stops data logging Pause Logging Pauses logging of data until Start is chosen from the Logging menu again or the Start button on the toolbar is pressed Section 3 3 20 Section 3 Operation...

Page 49: ...Options Opens the Logging Options window where you can configure the data output options 3 21 Section 3 Operation Section 3...

Page 50: ...As configured above the data output would appear similar to that shown below Section 3 3 22 Section 3 Operation...

Page 51: ...libration Setting the Zero and Span Select Calibration from the View menu to open the Calibration window This is the area in which you set the zero and spans of the LI 840A 3 23 Section 3 Operation Se...

Page 52: ...splay will show ZERO and the text in the Calibration window is grayed out The zero will be set electronically and the current date will be entered in the Last CO2 zero performed on field when complete...

Page 53: ...O2 The display will show SPAN for several seconds and the text in the Calibration window will be greyed out The span will be set electronically and the current date will be entered in the Last CO2 spa...

Page 54: ...CO2 at 300 ppm and 1500 ppm and you use one of them say 1500 ppm to set the span If you then flow the other gas through the LI 840A you would expect it to read within 1 of the expected value in our ex...

Page 55: ...he slope alone Setting the secondary span adjusts the slope then adjusts the offset value for the new slope value The slope and offset values can be viewed on the Advanced page Span offset values CO2...

Page 56: ...ns for performing a secondary span l Zero first l After zeroing do a normal span l The span and secondary span concentrations should be as far apart as possible and they should bracket the con centrat...

Page 57: ...Temp C Typical LI 840A 0 1 You can do multiple secondary spans after a normal span For example span at 200 then do a secondary span at 3000 Then assuming you didn t like the result for some reason you...

Page 58: ...may be found on the calibration sheet shipped from the factory In most cases you will not want to alter any of these values A description of the band broadening can be found in Appendix B Equation Sum...

Page 59: ...If new constants are entered in this window click Send Constants to send the values to the LI 840A for implementation In most cases you should not change the values in this window see Symbol Summary...

Page 60: ...aw mV output by a conversion factor which is dependent upon the selected voltage output range and the max imum CO2 or H2O resolution available set in software between 0 20 000 ppm In general the conve...

Page 61: ...xamples of values for this multiplier simply choose your DAC output range in the second row and then select the LI 840A CO2 range in the first column the full scale value minus the zero value follow a...

Page 62: ...riods of time and later transfer the results to a computer for further analysis Access to the voltage channels requires the 1400 301 Terminal block Voltage channels are des ignated by the letter V and...

Page 63: ...ch as CO2 4 Set Math Poly nomial and press Ent er 5 Set description as desired a0 the offset for scaled measurements a1 multiplier from Table 3 1 on page 3 33 or equation 3 13 and a2 a5 0 When finishe...

Page 64: ...Log Routine to the desired log routine 2 Set Calc Mean 3 To capture the minimum and maximum CO2 values set MinMax accordingly 4 TCoef has no effect when Calc Mean It is used only when integrating Sect...

Page 65: ...mple channels measure infrared gas absorption in a single path through the use of narrow band optical filters with appropriately selected bands The CO2 sample channel uses an optical filter centered a...

Page 66: ...Analog signals are available through a terminal block for collection by a data logger or similar means Optical Bench System The LI 840A CO2 H2O Gas Analyzer optical path is a thermostatically control...

Page 67: ...The detection system is shown in Figure 4 1 below Ribbon Cable Connector Gold Plated Optical Path Gold Plated Parabolic Reflector Source Detector Broad Band IR Source CO2 Filters 3 95 4 26 m H2O Filt...

Page 68: ...thermal temperature A longer period of approximately 20 minutes is required to bring the performance of the detection system to within 1 to 2 of reading As shown in Figure 4 1 on the previous page the...

Page 69: ...above The second function of the foam enclosure is to protect the optical bench from mechanical shock and vibration that might damage the mechanically sensitive components The foam enclosure is suppor...

Page 70: ...Section 4 4 6 Section 4 Theory of Operation...

Page 71: ...screws on the LI 840A 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 t...

Page 72: ...t u O r i A n I r i A PCB PCB Optical Bench Hose Barb Bev a line Tubing Ribbon Cable Connector There are four screws on the source and detector circuit boards that must be removed Section 5 5 2 Sectio...

Page 73: ...when cleaning or replacing the optical path O ring Top View End View There are a number of swabs in the spare parts kit Dip one end of the swab into a 50 50 eth anol water solution and carefully swab...

Page 74: ...not to cut the tubing or scratch the hose barb with the cutters as subsequent tubing connections may leak if the hose barb is damaged 5 Let the optical bench dry 6 Re assemble the bench making sure th...

Page 75: ...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 840A The fuse is located on the main circuit board near the Flow In port as shown b...

Page 76: ...tial of degrading the accuracy specification for CO2 to as much as 3 of reading The H2O channel should remain within the published specification If the source fails the instrument can be returned to L...

Page 77: ...in data that was collected before and after storage If you don t have these data contact LI COR and we will provide the calibration data set for your instrument In the PC interface software click Vie...

Page 78: ...Section 5 5 8 Section 5 Maintenance...

Page 79: ...al Drift at 370 ppm 0 4 ppm C RMS Noise at 370 ppm with 1 sec signal filtering 1 ppm Sensitivity to water vapor 0 1 ppm CO2 mmol mol H2O H2O Measurement Range 0 60 mmol mol Accuracy Better than 1 5 of...

Page 80: ...V or 0 5V and two current 4 20mA Digital TTL 0 5V or Open Collector DAC Resolution 14 bits across user specified range Source Life 18 000 Hours Power Requirements Input Voltage 12 30 VDC 1 2A 12V 14W...

Page 81: ...ion function is the absorptance g P is the pres sure correction S is the span and T is the temperature C of the gas in the cell typically 51 5 C Absorptance is computed from B 2 where V and Vo are the...

Page 82: ...al function gw of absorptance and pressure P B 5 The value of Po is 99 kPa When the pressure correction is not enabled gw is simply 1 0 Values for gw can be viewed on the diagnostics window see Operat...

Page 83: ...ning effect that is accounted for in the computation of concentration equation B 12 CO2 absorptance c is computed from B 8 where Vc and Vco are the raw detector signals for sample and reference Zc is...

Page 84: ...e obtained from the calibration coefficients equation B 13 B 10 When P Po B 11 where X A and B are computed as in equation B 9 The variable gc is viewable on the dia gnostics window see Operation on p...

Page 85: ...nd whose coefficients a1 a4 are given on the calibration sheet B 13 Solving equation B 13 for C yields the calibration function B 14 Where B 15 W accounts for band broadening by water vapor and is vie...

Page 86: ...ation B 10 and bw is the low concentration band broadening coefficient 1 45 This is the value shown on the calibration sheet as BB 1 45 The present value of h c is viewable on the Diagnostics screen S...

Page 87: ...band broadening corrections to be turned off by setting bw to 1 When bw 1 h c 1 everywhere Also to avoid computational problems underflows overflows and division by zero we constrain the argument c w...

Page 88: ...g CO2 When the command for zeroing CO2 is received the LI 840A computes the CO2 zero term from equation B 20 where and are averaged for 5 seconds B 20 Spanning H2O When the command for setting the spa...

Page 89: ...n command for H2O is received the instrument computes new values for both Sw0and Sw1 First it measures a new and computes a new from equation B 22 Then it uses these plus the retained values and from...

Page 90: ...e target concentration CT the LI 840A computes Sc0 from equation B 26 where and are averaged for 5 seconds B 26 where B 27 Note that B 28 The instrument retains the following values which are used for...

Page 91: ...s the retained values c1 and c1 from the previous normal span to com pute B 31 Given the new span slope Sc1 update the span offset Sc0 by equation B 26 Symbol Summary Many of the quantities described...

Page 92: ...ance gc c P AUXdata pcA Pressure corrected absorptance of CO2 C data co2 CO2 mol mol 1 Vw data raw h2o Raw detector readings Vwo data raw h2oref Vc data raw co2 Vco data raw co2ref aw1 aw3 poly h2o Ca...

Page 93: ...poly xs Cross sensitivity coefficient bw poly bb Band broadening coefficient for low CO2 h c AUXdata bb_EFF Computed band broadening coeff for the current absorptance W AUXdata psi Band broadening cor...

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Page 95: ...Appendix C Pin Assignments The figure below indicates pin assignments for the DB 9 connector 1 6 2 3 8 7 4 9 5 Data RXD Data TXD Signal Ground SG Appendix C Pin Assignments C 1...

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Page 97: ...es 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 ClO4 2...

Page 98: ...lO4 2 Part M54 500 500g FAX 201 379 7415 Toll free 800 776 7000 Toll free FAX 800 926 1166 Thomas Scientific www thomassci com P O Box 99 Soda Lime Part C703 B76 Swedesboro NJ 08085 6099 Mg ClO4 2 Par...

Page 99: ...609 467 2000 FAX 614 881 5989 FAX 609 467 3087 Toll free 800 858 9682 Toll free 800 345 2100 Toll free FAX 800 345 5232 P W Perkins Co Inc Fisher Scientific www pwperkins com www fishersci com 856 76...

Page 100: ...r Brumfield Products Div 9525 Chesapeake Dr Siemens Electromechanical Components Inc San Diego CA 92123 200 S Richland Creek Dr 800 827 9366 Princeton IN 47671 0001 FAX 619 715 7280 info ae sec siemen...

Page 101: ...on the use of tags to Markup or give structural rules to a set of data A tag is a descriptive identifier enclosed between a less than and a greater than symbol used in part to describe a piece of data...

Page 102: ...ta NAME FIRST George FIRST LAST Smith LAST NAME In this example the outermost element NAME encompasses two other elements that contain data All elements combined make up the XML document Connecting an...

Page 103: ...the desired values turned on To turn on the data value set the value of the element to TRUE As an example the following string is sent to the instrument after a con nection has been made between the...

Page 104: ...FALSE ACK LI840 For example suppose that you would like to reconfigure the LI 840A to stop outputting cell temperature Here is the command to send to the LI 840A LI840 RS232 CELLTEMP FALSE CELLTEMP RS...

Page 105: ...the LI 840A to send the most recent set of data values as configured as an XML doc ument Sending this command LI840 CFG CFG LI840 instructs the LI 840A to send an XML document containing all of the co...

Page 106: ...returned from the LI 840A if the command was accepted LI840 ACK TRUE ACK LI840 3 After a few seconds all of the calibration information is returned from the LI 840A indicating that it has finished the...

Page 107: ...40 To Zero the LI 840A 1 Send the XML command to initiate the zero LI840 CAL DATE YYYY MM DD DATE CO2ZERO TRUE CO2ZERO CAL LI840 2 Wait for the acknowledgment 3 Wait for the date to be returned to ver...

Page 108: ...for the acknowledgement 3 Wait for the date to be returned to verify the span operation succeeded If the operation fails an ERROR will be sent To Perform a Two Point Span 1 Send the XML command to in...

Page 109: ...CAL DATE YYYY MM DD DATE CO2SPAN2 Gas Concentration CO2SPAN2 CAL LI840 5 Wait for the acknowledgment 6 Wait for the date to be returned to verify the span operation succeeded If the operation fails a...

Page 110: ...digit year 2 digit month 2 digit day Example 2002 04 27 XML Grammar LI840 ACK bool ACK VER string VER DATA CELLTEMP float CELLTEMP CELLPRES float CELLPRES CO2 float CO2 CO2ABS float CO2ABS H2O float...

Page 111: ...UXDATA RS232 CO2 bool CO2 H2O float H2O CELLTEMP bool CELLTEMP CELLPRES bool CELLPRES IVOLT bool IVOLT CO2ABS bool CO2ABS H2OABS bool H2OABS H2ODEWPOINT bool H2ODEWPOINT RAW CO2 bool CO2 CO2REF bool C...

Page 112: ...loat LOW LDEAD float LDEAD ALARMS BENCH 5 14 BENCH SPAN int SPAN DACS RANGE 2 5 5 0 RANGE SET1 float SET1 SET2 float SET2 D1 NONE CO2 H2O H2ODP CELLTEMP CELLPRES D1 D1_0 float D1_0 D1_F float D1_F D2...

Page 113: ...an2 float co2span2 H2OZERO float H2OZERO H2OKSPAN float H2OKSPAN h2okspan2 float h2ospan2 or CO2LASTZERO iso date CO2LASTZERO CO2LASTSPAN iso date CO2LASTSPAN H2OLASTZERO iso date H2OLASTZERO H2OLASTS...

Page 114: ...A4 float A4 CO2 H2O A1 float A1 A2 float A2 A3 float A3 H2O PRESS A0 float A0 A1 float A1 PRESS POLY ERROR string ERROR LI840 Appendix E Appendix E Configuration Grammar E 14...

Page 115: ...Comments LI840 N A root ACK VER ERROR DATA AUXDATA RS232 CFG CAL POLY LI840 is the root tag for all XML statements A outputs the entire XML document Examples LI840 LI840 LI840 ACK TRUE ACK LI840 Appen...

Page 116: ...IVOLT RAW DATA contains all data values sent from the LI 840A All of the elements within the DATA tag are readable only A requests all data values to be output Examples LI840 DATA CO2 2 34e2 CO2 IVOLT...

Page 117: ...H2OABS DATA Float R H2O absorption CELLTEMP DATA Float R Cell temperature CELLPRES DATA Float R Cell pressure IVOLT DATA Float R Input voltage RAW DATA CO2 Raw detector readings CO2REF H2O H2OREF Exam...

Page 118: ...EF RAW Integer R Tag Parent Value s R W Comments AUXDATA LI840 AUXDATA contains all auxiliary data values that can be retrieved from the LI 840A All of the elements witin the AUXDATA tag are readable...

Page 119: ...I AUXDATA Float R BB_EFF AUXDATA Float R Tag Parent Value s R W Comments RS232 LI840 CO2 CO2ABS H2O H2ODEWPOINT H2OABS CELLTEMP CELLPRES IVOLT RAW ECHO STRIP Setting RS232 values will determine what v...

Page 120: ...ES RS232 TRUE FALSE R W Cell pressure IVOLT RS232 TRUE FALSE R W Input voltage RAW RS232 CO2 Raw detector readings CO2REF H2O H2OREF ECHO RS232 TRUE FALSE R W Echo commands sent to LI 840 STRIP RS232...

Page 121: ...Tag Parent Value s R W Comments CO2 RAW Integer R CO2REF RAW Integer R H2O RAW Integer R H2OREF RAW Integer R Appendix E Appendix E Configuration Grammar E 21...

Page 122: ...FG LI840 OUTRATE HEATER PCOMP DOFFSET FILTER ALARMS DACS BENCH SPAN Elements within the CFG tag control system set tings Example LI840 CFG HEATER TRUE HEATER PCOMP TRUE PCOMP CFG LI840 Appendix E Appe...

Page 123: ...r on off PCOMP CFG TRUE FALSE R W Pressure compensation on off FILTER CFG 0 to 20 R W Set a 0 to 20 second filter ALARMS CFG SOURCE ENABLED HIGH HDEAD LOW LDEAD High and low alarm settings DACS CFG RA...

Page 124: ...alarm on at this value HDEAD ALARMS Float R W High alarm off at this value LOW ALARMS Float R W Low alarm on at this value LDEAD Float R W Low alarm off at this value Example LI840 CFG ALARMS ENABLED...

Page 125: ...st be NONE D1 DACS CO2 H2O H2ODEWPOINT CELLPRES CELLTEMP NONE R W DAC1 D1_0 DACS Float R W Value where DAC1 outputs 0V D1_F DACS Float R W Value where DAC1 outputs full scale D2 DACS CO2 H2O H2ODEWPOI...

Page 126: ...LI840 CFG DACS RANGE 2 5 RANGE D1 CO2 D1 D2 CELLTEMP D2 DACS CFG LI840 Appendix E Appendix E Configuration Grammar E 26...

Page 127: ...H2OLASTSPAN2 H2OKZERO H2OKSPAN H2OKSPAN2 CO2ZERO CO2SPAN CO2SPAN2 CO2LASTZERO CO2LASTSPAN CO2LASTSPAN2 CO2KZERO CO2KSPAN CO2KSPAN2 POLY Calibration parameters When calibrating DATE must be paired with...

Page 128: ...econd H2O span H2OLASTZERO CAL 20 character date R Date the LI 840A was last zeroed H2OLASTSPAN CAL 20 character date R Date the LI 840A was last spanned H2OKZERO CAL Float R W Calibration constant H2...

Page 129: ...ZERO CAL Float R W Calibration constant CO2KSPAN CAL Float R W Calibration constant CO2KSPAN CAL Float R W Calibration constant Tag Parent Value s R W Comments POLY LI840 LI840 R W Serial number and f...

Page 130: ...rText ERROR LI840 LI840 CAL CO2LASTSPAN isodate CO2LASTSPAN CO2LASTZERO isod ate CO2LASTZERO CO2KZERO float CO2KZERO CO2KSPAN float CO2KSPAN CAL LI840 Tag Parent Value s R W Comments LI840 POLY 20 cha...

Page 131: ...loating point coefficients for the H2O calibration polynomial PRESS POLY A0 A1 R W Floating point coefficient for CO2 pressure correction Tag Parent Value s R W Comments ACK LI840 TRUE FALSE R Acknowl...

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Page 133: ...r workmanship without charge and only under the following conditions which are 1 The defects are called to the attention of LI COR Inc in Lincoln Nebraska in writing within one year after the shipping...

Page 134: ...limited to repair or replace any part of the instrument without charge if LI COR Inc s examination disclosed that part to have been defective in material or work manship There are no warranties expres...

Page 135: ...d to a user who is a customer or eighteen months from the date of ship ment to LI COR Inc s authorized distributor whichever is earlier This warranty supersedes all warranties for products purchased p...

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Page 138: ...ge in a Changing World LI COR Inc Environmental 4647 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 envsales licor com...

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