manualshive.com logo in svg

LI-COR LI7200RS, Instruction Manual

Share
Download
LI-COR LI7200RS Instruction Manual Download Page 183

LI-7200RS Transfer Functions and Signal Processing

The LI-7550 Analyzer Interface Unit used with the LI-7200/RS has a Digital Signal
Processing (DSP) bandwidth that is selectable in the Outputs>Setup window.

A plot of the transfer functions for the 3 selectable DSP bandwidths is shown below
in

Figure 8-2

below. Care was taken in the design of the DSP filters to ensure that

the transfer functions have a very flat passband.

Figure 8-2. Detail of LI-7550 DSP filter passbands.

The analog signal conditioning that occurs before the DSP filtering is fixed and
may cause a small amount of additional attenuation.

The frequency response of the LI-7200/RS will be a combination of the optical cell
frequency response multiplied by the signal processing frequency response (band-
width setting). With air flow rates of 15 Liters/minute the signal processing band-
widths of 5 Hz or 10 Hz should be used. A signal processing bandwidth of 20 Hz is
more appropriate if a higher air flow rate is used.

Section 8. Theory of Operation

8-11

LI-7200RS Transfer Functions and Signal Processing

Summary of Contents for LI7200RS

Page 1: ...Enclosed CO2 H2O Gas Analyzer Instruction Manual...

Page 2: ......

Page 3: ...da envsales licor com Regional Offices LI COR Biosciences GmbH Siemensstra e 25A 61352 Bad Homburg Germany Phone 49 0 6172 17 17 771 envsales gmbh licor com LI COR Biosciences UK Ltd St John s Innovat...

Page 4: ...f LI COR Inc Microsoft and Windows are registered trademarks of Microsoft Corporation Eurofast is a registered trademark of Turck Inc Campbell Scientific is a registered trade mark of Campbell Scienti...

Page 5: ...ables and Wires Metal Parts Plastic Parts X X X X X SJ T 11364 O GB T 26572 indicates that the content of the toxic and hazardous substance in all the Homogeneous Materials of the part is below the co...

Page 6: ...data collected and the cleaning frequency of optical components New instruments will provide a noticeable difference in measurements in many circumstances Older instruments can be upgraded to the new...

Page 7: ...Intake Tube 2 6 Intake Tube Dimensions 2 9 Installing the 2 micron Dust Filter 2 9 Installing the Intake Cap 2 10 Mounting the Sensor Head and Intake Tube 2 12 Connecting the Sensor Head Cable 2 15 T...

Page 8: ...d Intake Tube 3 33 Entering LI 7700 Information 3 33 Connect with an LI 7700 3 34 Enter analyzer information 3 34 Select variables 3 35 Entering Biomet System Information 3 36 Connecting to a datalogg...

Page 9: ...bleshooting LI 7200 RS is Identified as an LI 7500A RS in the Software Interface 6 1 Power On Problems 6 1 Problems with the SmartFlux 2 System 6 2 Ethernet Connection Problems 6 3 Instrument not visi...

Page 10: ...27 Note on Data Output Rates 7 27 Diagnostic Messages 7 27 General indicators 7 28 Test Point Values 7 29 Waveform 7 32 Configuration Files 7 34 Section 8 Theory of Operation Relating Absorption to Co...

Page 11: ...ix Appendix C Suppliers Appendix D Configuration Grammar Appendix E Warranty Appendix F Index...

Page 12: ...x...

Page 13: ...of CO2 and H2O in the sample cell 150 Hz are digitally filtered to provide true 5 10 or 20 Hz bandwidth l High speed measurements of pressure in the sample cell and air temperature at the cell inlet...

Page 14: ...erify that you have received everything that was ordered Note You need the PC software to configure the instrument Download it from the LI COR technical support web site www licor com env support Sele...

Page 15: ...2 U Bolt x 20 2 184 09842 Hex Nut 4 163 00138 Santoprene 1 16 inside diameter 0 6 m 2 ft 1 222 08325 Quick Connect Plug 10 300 07393 Cables Most cables are 5 meters long The sensor head cable can be e...

Page 16: ...Ethernet adapter cable that is terminated with an RJ45 connector and is used to connect the 5 meter Ethernet cable to an Ethernet wall socket or into your computer s Ethernet port RS 232 Serial Cable...

Page 17: ...values are unique to each sensor head and have been entered into the corresponding LI 7550 at the factory Keep this sheet in case you need to re enter these values You can also acquire a copy of your...

Page 18: ...rated drive is included with the instrument There are three Ethernet connectors inside the LI 7550 two of which are connected to the external ports Figure 1 2 LI 7550 interior Note Only use an indust...

Page 19: ...ure 1 4 Pin assignments and wire colors for Power SDM Auxiliary Input and DAC Output cables The lower left section describes blink patterns given by the USB indicator LEDs Section 1 General Informatio...

Page 20: ...Section 1 General Information 1 8 LI 7200RS Enclosed CO H O Analyzer...

Page 21: ...cribed in greater detail elsewhere in this manual 1 Connect the Sensor Head Cables The cable bundle includes two cables and a small tube Align the connectors push straight in and tighten the connector...

Page 22: ...l the tubing between the flow module and analyzer outlet Install the cable between the ACCESSORY connection on the flow module and LI 7550 4 Power On the Analyzer and Flow Module The power cable part...

Page 23: ...ill be in the Programs menu under the LI COR folder 7 Connect to the Instrument Launch the PC software then select your instrument from the list and click Con nect 8 Verify the Instrument Response If...

Page 24: ...ccording to specifications in direct sun Determine the height at which the sensor head will be mounted and plan to mount the Analyzer Interface Unit accordingly The head cable is 5 meters long An exte...

Page 25: ...ter but you can make it as short as 15 cm Shorter tubes can lessen tem perature attenuation and make it difficult to mount analyzer without distorting the wind flow Longer intake tubes can lead to hig...

Page 26: ...re using the heated intake tube What s Included The heated intake tube kit includes the following components Description Part Number Heated Intake Tube Swagelok Spacer with Nuts and Ferrules Accessory...

Page 27: ...nnectors get snug wiggle and tighten them again to ensure a weather tight connection Figure 2 2 The Accessory Junction Splitter is used for all heated intake tubes Early models have a T shaped splitte...

Page 28: ...old intake tube if installed 2 Install the particulate filter optional Air should flow in the direction indicated on the filter 3 Install the tube in the analyzer head Tighten all fittings securely 4...

Page 29: ...the optical cell Important The filter does not completely eliminate the need to regularly clean the optics Regular cleaning is required in order to prevent measurement drift that can occur when certa...

Page 30: ...eated in the filter Tighten the fitting to hand tight then about turn more using 9 16 and 1 wrenches 4 Install the nut front ferrule and back ferrule on the intake tube 5 Install the inlet cap Install...

Page 31: ...the stainless steel intake tube until it stops The intake tube should extend 1 inch 2 54 cm into the cap 3 Using a pliers grasp the hose clamp to expand it Slide it over the inlet cap as shown and rel...

Page 32: ...tube The heated intake tube is similar Position the intake to minimize vertical and horizontal separation between the intake and the center of the sonic anemometer while also minimizing distortion of...

Page 33: ...the horizontal sensor separation and wind flow disturbance Figure 2 6 Close to the plant canopy top mount the intake alongside the sonic path to minimize the vertical sensor separation Do not place t...

Page 34: ...cus tomized intake tube and user supplied inlet For very rainy environments tilt the analyzer even more and bend the intake tube to prevent water from being drawn in The insulated intake tube can be b...

Page 35: ...gasket l Provide a loose bend radius to allow the cable to absorb the energy of the bend ing over a greater portion of its length Use a minimum bend radius of 5 times the cable diameter For the head...

Page 36: ...le however flow dry CO2 free gas through the cell and check the zeros If they are not close the windows may need further cleaning or the internal chemical bottles may need to be replaced If you decide...

Page 37: ...the instrument water vapor can be drawn into the LI 7550 and condense which could result in damage to the electronics Under normal operating conditions the heat dissipated in the LI 7550 is sufficient...

Page 38: ...o help ensure that the desiccant does not become saturated open the LI 7550 door only when needed Opening the door allows humid air into the LI 7550 which depletes the desiccant The desiccant should b...

Page 39: ...rce 5 mA maximum The ASI can also be configured to work with the LI 7700 Open Path CH4 Ana lyzer There is a small jumper located at position LK1 far right in Figure 2 8 above When using the ASI with t...

Page 40: ...4 positive 10 GND Ground 11 AUX4 Auxiliary Input 4 negative 12 GND Ground 13 5V 5V supply 14 GND Ground Terminal positions for analog outputs are Terminal Analog Outputs2 Description 1 DAC1 DAC chann...

Page 41: ...mon outputs can share these out puts with their power supply ground l LI 7550 analog inputs are electrically isolated from the LI 7550 power input l LI 7550 analog outputs are elec trically isolated f...

Page 42: ...gland plug cap 6 Attach the ASI cable connector to the ANALOG IN connection on the Analyzer Interface Unit There are 5 EPDM type plugs inside the box that can be inserted into unused gland plugs The...

Page 43: ...Download the software and install it on your computer The program icon will be in the Programs menu in the LI COR folder Connecting with the Analyzer Launch the software to open the Connect window Her...

Page 44: ...t name is the serial number of the Analyzer Interface Unit l Yellow indicators show that the instrument embedded software is incompatible with the PC software You can still connect but there may be is...

Page 45: ...s with the instrument If something is wrong it will time out after about 15 seconds If this happens make sure you selected the correct instrument and retry Connect over Serial RS 232 The LI 7550 RS 23...

Page 46: ...elect from 9600 19200 38400 57600 or 115200 The Update Rate is the communication frequency between the instrument and the computer Select from 0 1 0 2 0 5 1 2 5 10 or 20 Hz Note that at 9600 baud the...

Page 47: ...t can then be saved and transferred to instruments in the field Much of the functionality of the software is disabled in this mode e g data will not appear so charting is unavailable but features that...

Page 48: ...d to configure or connect with the system components l Sonic anemometer input settings l LI COR Biomet System or supported Campbell Scientific datalogger l LI 7700 Open Path CH4 Analyzer l SmartFlux S...

Page 49: ...ot logging l USB Size Total storage capacity of the USB drive inside the LI 7550 l USB Free Space Available space on the USB drive inside the LI 7550 l Last Run Last half hour flux processing run by E...

Page 50: ...the CO2 H2O gas analyzer l OK Normal operation l Check Tin Check Tout Indicates an error from a thermocouple Tin is the inlet thermocouple Tout is the outlet thermocouple l LI 7700 Indicates the statu...

Page 51: ...indicates waiting to connect or that the system has become disconnected l Sonic Anemometer Indicates the status of the sonic anemometer if using SmartFlux 2 l None Sonic anemometer not connected or n...

Page 52: ...strument Click the button to open the charting dialog see Charting on page 7 33 Note It may take several minutes after you select a tab for data to load into the graph l Results If the SmartFlux or Sm...

Page 53: ...mmol mol l CH4 mol mol LI 7700 required l Wind speed If the SmartFlux or SmartFlux System is properly configured this tab presents mean wind speed by direction Duration sets how many days of data are...

Page 54: ...Section 3 Operation 3 12 LI 7200RS Enclosed CO H O Analyzer...

Page 55: ...3 1 below Variable Description Time Time in HH MM SS MS Date Date in YY MM DD Sequence Number1 Index value increments every 3 3 ms 1 300s CO2 mmol m3 CO2 molar density CO2 mg m3 CO2 mass density CO2 A...

Page 56: ...gth CO2 Signal Strength Sc H2O Signal Strength H2O Signal Strength Sw Average Signal Strength Sc Sw 2 Delta Signal Strength Sc Sw 7550 Auxiliary Input 1 Auxiliary input 1 value 7550 Auxiliary Input 2...

Page 57: ...from source in absorbing wavelength for H2O H2O Reference Floating point value power received from source in reference non absorbing wavelength for H2O CH4 Seconds Time from the LI 7700 CH4 Nanosecond...

Page 58: ...eded for processing the file from any external data source l Easily store raw data for future reprocessing l Account for dynamic site parameters that change over the course of the data col lection per...

Page 59: ...3 20 File Duration 30 Minutes Compress files ghg check this box When out of space As desired Site Setup Site Description Station name Name of the station Entering the Site Description on page 3 21 Ca...

Page 60: ...e Flow Rate lpm Set to On Site Setup CH4 Analyzer if using an LI 7700 Connect to LI 7700 Select if using LI 7700 Entering LI 7700 Information on page 3 33 Northward separation cm Measured at site East...

Page 61: ...ne Select your EC station s time zone from the dropdown list If the loc ation observes daylight savings time you should choose an offset from etc GMT in order to avoid overwriting or creating duplicat...

Page 62: ...for managing data when the USB drive becomes full Data can be logged at up to 20 Hz These files can be split into smaller files at 30 minute 1 hour 2 hour or 4 hour intervals For eddy covariance sele...

Page 63: ...height Also referred to as zero plane displacement height the dis placement height of a vegetated surface usually designated d is the height at which the wind speed would go to zero if the logarithmic...

Page 64: ...er it gets adequate GPS signals GPS format WGS84 Latitude and longitude coordinates are automatically detec ted by the SmartFlux 2 System or they can be entered manually Format Description Example DDD...

Page 65: ...SmartFlux 2 System Port mandatory with digital connection Choose the SmartFlux 2 port to which your anemometer is connected Sonic connected to the analog inputs on the LI 7550 Choose this option if yo...

Page 66: ...From the three axis velocities the wind speed is cal culated and output as either signed U V and W as Polar and W or as raw velocity values The units of output are set during the anemometer configurat...

Page 67: ...s measured to center of the anemometer sample volume Configuring the Analog Anemometer Inputs When the anemometer is connected to the LI 7550 using the analog signals the Inputs dialog must be configu...

Page 68: ...ind speed m s as measured toward the direction of 90 coun terclockwise from the north spar l W Vertical wind speed m s as measured up the mounting shaft l Ts Sonic temperature C l SOS Speed of sound m...

Page 69: ...d W values in volts but want the data file and metadata file to record these values in m s you will need to set the multiplier and offset values to rescale the data The following table gives the appro...

Page 70: ...ou have configured the Gill WindMaster to output raw voltages for auxiliary input U over the range of 5V and over a full scale wind speed of 30 to 30 m s You want to convert the raw voltages to wind s...

Page 71: ...em which allows EddyPro to determine the distance from a gas analyzer and the anemometer Important At least one separation must be different from 0 Values are meas ured at the site and are relative to...

Page 72: ...cm mandatory East or west distance between the LI 7500A RS sample path or LI 7200 RS inlet and the reference anemometer Pos itive values if east and negative values if west of the anemometer Vertical...

Page 73: ...ng from tubing filters the sensor head or obstructions in the filter tubing The range is from 0 to 4 5 kPa with a normal reading near 1 0 This value will rise if the fil ter becomes clogged indicating...

Page 74: ...in centimeters Tube diameter mm mandatory LI 7200 RS intake tube inside diameter in mil limeters Insulated Intake Tube l Tube length 100 cm enter the total length l Tube inside diameter 5 33 mm Heated...

Page 75: ...Desired power to be delivered to the heated intake tube Typically 4 W In tropical and other extremely humid environments use 6 W A setting as low as 0 5 W can prevent condensation in the tube but 4 W...

Page 76: ...or OK When you start logging data with the LI 7550 via USB the chosen data values for the LI 7700 will be logged as well IMPORTANT To synchronize the clocks of the LI 7500DS LI 7500A RS or LI 7200 RS...

Page 77: ...This value is negative if the center of the LI 7700 sample volume is below the center of the reference anemometer sample volume and positive if the gas sample is above Select variables In the Site Se...

Page 78: ...g in compressed ghg files Entering Biomet System Information A properly configured LI COR Data Acquisition System or Biomet system Sutron 9210 datalogger can be connected to the to the eddy covariance...

Page 79: ...onnect CR3000 CR1000 CR6 With this selection enter the IP address in the Datalogger IP Address field and click Connect Note The datalogger IP address is a user assigned static IP address that is also...

Page 80: ...is for reference only Note Enable the Sync clock to 7550 under Site Setup Biomet to synchronize the datalogger and LI 7550 clocks Refer to the LI COR Data Acquisition Sytem or the Biomet System Sutro...

Page 81: ...ux 2 System Select Use Express Mode to activ ate the setting l To process data with EddyPro Advanced settings click the Upload Advanced File button and select the smartflux file created in EddyPro The...

Page 82: ...pp1 fluxsuite com and create a station key Enter the key in this tab and set the update rate Connect to a Data Repository The Data Repository tab is where you configure the eddy covariance system to p...

Page 83: ...the Server URL and login credentials In the Server URL field you have some options that enable you to specify which data should be transferred Suitable URLs l https server address l sftp server addres...

Page 84: ...ta collection end time Some examples follow l sftp 192 168 100 100 filename l sftp 192 168 100 100 home station filename l https some_url com upload etc md5 filename File Types The types of files that...

Page 85: ...a Under the PhenoCam tab you can connect to a CC5MPX digital camera When connected the images will be posted to FluxSuite assuming you have registered and configured everything else To connect with th...

Page 86: ...nu Click Start to begin logging data Data logging will begin automatically when a suitable USB drive is inserted into the SmartFlux 2 System USB port and any time the instrument restarts Click Stop to...

Page 87: ...H4 Analyzer are both logging data at 20 HZ with 53 columns of data a one hour file would be approximately 30 MB uncompressed and 7 MB com pressed for an approximate 4x compression ratio File compressi...

Page 88: ...e or a File Transfer Protocol FTP application The Download utility allows you download and delete files that are stored on the USB drive You can access the files remotely so long as you can connect to...

Page 89: ...wnload utility l Set the download to begin at 00 15 12 15 am if you are using the SmartFlux System That way all the logged files for the previous day will be processed before the download begins l Clo...

Page 90: ...ion file In this section we describe how to use Express and Advanced processing modes Express Processing EddyPro Express mode is the default configuration for the flux computation in the SmartFlux Sys...

Page 91: ...In order for the parameters to be valid the site must not have under gone any significant changes between the time when the existing data set was collected and when the SmartFlux or SmartFlux 2 System...

Page 92: ...ntend to use planar fit automatic time lag optimizations or in situ spectral corrections l Set the Raw Data Directory to a ghg file with metadata that applies to your site l Select variables and set f...

Page 93: ...package select a directory and click Create The configuration file has a smartflux extension 5 Upload the SmartFlux configuration file to the SmartFlux System or SmartFlux 2 System See Loading a Smart...

Page 94: ...out when it is suggested to use these options If you do not have previously collected ghg files then you will need to run the sys tem for a suitable amount of time for example using SmartFlux in Expre...

Page 95: ...able in the SmartFlux System or SmartFlux 2 System In the Spectral assessment file available entry select the spectral assessment file created earlier Then proceed normally and when done click on the...

Page 96: ...R eddy covariance systems are designed around one only anemometer which is detected automatically in the SmartFlux or SmartFlux 2 System as the master 3 In Advanced Settings Processing Options all pro...

Page 97: ...ections are available However A In the Correction for low pass filtering effects the method by Fratini et al 2012 is deactivated because this method requires an auxiliary file that is currently not av...

Page 98: ...rd EddyPro instead D All full length co spectra outputs are deactivated These files occupy large amounts of disk space and are thus not allowed in the SmartFlux or SmartFlux 2 System To obtain full le...

Page 99: ...They follow a format typical of EddyPro outputs as described in detail in the EddyPro help Daily Summaries These logged data summaries typically named something like YYYY MM DD_AIU xxxx_Summary includ...

Page 100: ...the latest files recorded the oldest files are overwritten when the internal memory gets full Do not depend upon the internal memory as a primary backup for your data because old files are automatical...

Page 101: ...the stability of the instrument see How Stable are Zero and Span below How Stable are Zero and Span The analyzer s zero is primarily affected by temperature and the state of the internal chemicals The...

Page 102: ...the analyzer reading in the software dashboard A suitable source of air for setting the zero can be gen erated with chemical scrubbers such as soda lime for removing CO2 and mag nesium perchlorate or...

Page 103: ...sig nificantly different from the actual gas concentration Set the flow rate to 0 5 to 1 0 lpm Check the analyzer reading in the software dashboard CO2 Span Gas Regulator Rotameter 100 cc min 5 10 20...

Page 104: ...tings alone than to rush through the procedure and make incorrect settings Span is a linear function of absorptance so there is an offset term and a slope term Both are determined at the factory and w...

Page 105: ...head 3 Connect the calibration gas to the air inlet fitting using 3 8 I D Bev a line tubing or with I D Bev a line tubing and the 3 8 1 4 adapter Do not try to insert Bev a line or other small diamete...

Page 106: ...nual tab and view the value of Zco CO2 Zero 7 Click the Zero tab When the reading has stabilized in the dashboard and the Gas Stability flag is green click Zero CO2 to set the CO2 zero After a brief d...

Page 107: ...ck the Manual tab and check the new CO2 Span value Sc typically 0 9 1 1 Span H2O 13 To set the H2O span flow air of known dew point at about 0 5 to 1 0 LPM To prevent condensation use a dew point temp...

Page 108: ...r You would normally choose a very low dewpoint such as 5 C and something close to just below ambient If the air temperature is 15 C or less you should probably avoid doing a secondary water vapor spa...

Page 109: ...se the concentrations if you wish The normal span can be the high dew point and the secondary the low dew point Also multiple secondary spans can follow a normal span Simply make sure that the concent...

Page 110: ...tion C f instead of density 4 4 If we assume that the CO2 span gas is dry then Pec P so 4 5 Similarly for a known H2O mole fraction W f and resulting measured absorptance w 4 6 Whenever the CO2 span i...

Page 111: ...ach time a normal water span is set the instrument retains 4 9 and when a secondary H2O span is performed at water mole fraction W f with meas ured absorptance w then the span slope term is computed f...

Page 112: ...Section 4 User Calibration 4 12 LI 7200RS Enclosed CO H O Analyzer...

Page 113: ...signal strength and record this for a baseline This will help you determ ine when the optics should be cleaned Every day or every few days Check the overall performance of the instruments including th...

Page 114: ...ngth on page 8 7 for more information Once per month Check the zero and span As you become familiar with your instrument you will probably find that this does not need to be checked as often If you ar...

Page 115: ...00 RS detector is not affected by UV radiation when the optical path is open The original LI 7200 detector however is affected by UV radiation Exposure to direct sunlight temporarily reduces the sensi...

Page 116: ...e gas analyzer disable the power supply or disconnect the power cable from the LI 7550 before conducting any maintenance that involves disassembly or disconnecting cables Disassembling the instrument...

Page 117: ...r head Remove the mounting bracket from the analyzer Then remove the thumbscrew and thread it into a cap Pull straight out to remove the plug Figure 5 2 Remove the thumbscrew thread it into the bottle...

Page 118: ...igure 5 4 Remove the upper sensor head housing bottle cover and replace the chemical bottle Insert the bottle cap first 6 Replace the cover retention screw and reattach the mounting bracket After inst...

Page 119: ...screen out of the cap 3 Assembly is the reverse of removal Be sure the screen is seated fully in the cap Maintaining the Filter How do you know when to clean the filter Dust will accumulate in the fil...

Page 120: ...ed Replacing the Fuses Important Power off the gas analyzer disable the power supply or disconnect the power cable from the LI 7550 before conducting any maintenance that involves disassembly or disco...

Page 121: ...the power cable from the LI 7550 before conducting any maintenance that involves disassembly or disconnecting cables Disassembling the instrument or detaching or attaching head cables while the instru...

Page 122: ...are present on the new board one is tacked onto the thermocouple board the other sits between the board and the opening and insert the new assembly making sure the two pins are inserted into the conn...

Page 123: ...ressure in the dashboard Alternatively if you inhale you should see a positive pressure You can also push or pull air through the tubing using a syringe 7 Observe the Head Pressure reading over about...

Page 124: ...et switch as shown or to an open Ethernet port inside the LI 7550 using an Ethernet cable with standard RJ45 connectors Important There must be a USB drive in the LI 7550 USB port For the best speed a...

Page 125: ...e is needed the Update FPGA button will become enabled in the application The FPGA update takes approximately 10 12 minutes Important Do not close the software or reset the instrument while the update...

Page 126: ...ace software for gas analyzers 1 The Windows interface software is an executable file named something similar to LI 7xxx_win 7 0 Double click to launch the installer 2 Follow the Windows Installation...

Page 127: ...ow e g F15 0 and the filter screen becomes clogged with debris the Motor Drive and Pressure Drop readings will increase as the motor will have to work harder to maintain the desired flow rate see Figu...

Page 128: ...an the screen with water or compressed air Figure 5 9 Plot of pressure drop kPa vs blower drive in 7200 101 During normal oper ation the 7200 101 pressure drop is about 1 0 kPa Typical maximum is abou...

Page 129: ...uring normal operation the 7200 101 operates at about 25 blower drive As the air filter gets clogged or the air tubing is kinked for example the blower drive percentage rises requiring more power Sect...

Page 130: ...Section 5 Maintenance 5 18 LI 7200RS Enclosed CO H O Analyzer...

Page 131: ...t it may be up to 37 W for a few seconds at cold temperatures The power draw will decrease over a period of up to 10 minutes after start up until the internal temperatures have stabilized Steady state...

Page 132: ...nterface Unit System not connected to the sonic anemometer l If you have renamed the SmartFlux 2 System does it have a valid name The SmartFlux 2 System name can only include upper and lower case lett...

Page 133: ...ia gnotics Some sonic anemometers have an upper voltage limit of 15 VDC In this case supplying an incoming 24 VDC to the SmartFlux 2 System could damage the sonic anemometer The same voltage provided...

Page 134: ...n back to what it was originally or to that set up in the RS 232 panel Port in use or does not exist Correct COM port selected This message indicates that the COM port setting on the Connect page is e...

Page 135: ...C software are com patible Reboot needed The instrument can be rebooted using the Reset button on the LI 7550 control panel Pressing the Reset button restarts the boot process if con nected via Ethern...

Page 136: ...de the LI 7550 If the source is Aux iliary Input 2 then the pressure is from an external sensor that you have connected This signal is modified according to the Auxiliary Coefficients that appear on t...

Page 137: ...ion are obviously bad then the problem is in one of the following calibration coefficients span parameter pressure value and the band broadening value CO2 only Readings Very Noisy Put the calibration...

Page 138: ...Section 6 Troubleshooting 6 8 LI 7200RS Enclosed CO H O Analyzer...

Page 139: ...ime keeping system PTP is a high pre cision time synchronization protocol for networked devices Devices controlled with PTP can maintain accuracy in the sub microsecond range with a sufficiently accur...

Page 140: ...n nections via the LI 7550 Analyzer Interface Unit Consequently the analyzer uses Coordinated Universal Time UTC for its onboard timekeeping tasks The default time stamp is therefore UTC based but loc...

Page 141: ...aster Clock algorithm could be LI 7550 This setting should be used in most circumstances l Slave Only The LI 7550 always syncs to another clock It will search the net work and synchronize to the best...

Page 142: ...ields are filled in automatically if you choose to enter the IP address manually the address fields are editable The Subnet mask is a set of 4 octets used to separate an IP address into two parts the...

Page 143: ...uch as a cellular modem The instru ment will acquire a private IP address from the cellular modem but this address is only visible to nodes on the private network On the other hand the cellular modem...

Page 144: ...two port forwarding rules must be set up similar to that shown below Instrument Public IP Public Port Private IP Private Port 1 166 66 77 88 7201 192 168 100 5 7200 2 166 66 77 88 7202 192 168 100 6...

Page 145: ...ru ment This can be useful for diagnosing problems as a LI COR technician can gauge the instrument s response to given commands and determine if the instru ment is functioning properly Contact LI COR...

Page 146: ...en temperatures are below 5 C Do not set the chopper housing temperature to 5 C when ambient temperatures are above 5 C however as the instrument will not function properly IMPORTANT When changing bet...

Page 147: ...on is star ted and or stopped manually by clicking the dt Integration On or dt Integration Off buttons available on the dashboard as well Example Start integrating CO2 mol mol after it reaches a value...

Page 148: ...onfigure under Inputs l Auxiliary Inputs Can be used for sonic anemometer data analog data l Temperature Source Specifies whether the temperature source is the instru ment a temperature sensor on Auxi...

Page 149: ...e differential between the head and the box LI 7550 The Total Pressure is the box pressure plus the head pressure If you use your own temperature and or pressure sensors one or two of these chan nels...

Page 150: ...232 Ethernet or Synchronous Device for Measurement SDM outputs The Setup tab presents Delay Time and Bandwidth settings that affect all outputs RS 232 Ethernet DACs and SDM Bandwidth 5 10 or 20 Hz de...

Page 151: ...nu to select from 9600 19200 38400 57600 or 115200 baud Use the Update Rate menu to select from 1 2 5 0 1 2 5 10 or 20 Hz Note that at lower baud rates you may not be able to output all data items at...

Page 152: ...he data records Depending on your recording device a line feed carriage return or both may be required to properly parse the data records Under Data Output select the data records that you want to out...

Page 153: ...capability to output up to 6 variables on DAC channels 1 6 The DACs page allows you to configure the DAC output channels by specifying the source channel e g CO2 mmol m3 that drives the analog signal...

Page 154: ...re enabled in Campbell Scientific Inc dataloggers with the LI7200 instruction This instruction is only available in dataloggers pro grammed in CRBasic e g CR5000 When using this instruction parameter...

Page 155: ...Pressure kPa Tin C Tout C Aux channel 1 Aux channel 2 Aux channel 3 Aux channel 4 4 CO2 mmol m3 H2O mmol m3 CO2 absorptance H2O absorptance Signal Strength average Ptotal kPa Tin C Tout C Block Temper...

Page 156: ...delay of 172 milliseconds for the DAC out puts and 130 ms for the SDM RS 232 and Ethernet outputs This delay can be increased in increments of 1 150 seconds 6 667 ms to minimize offsets between the g...

Page 157: ...a frequency greater than or equal to 2 times the bandwidth Thus if you are sampling at 10 Hz the bandwidth is 5 Hz Bandwidth is the frequency at which the indicated amplitude is 0 707 of the real amp...

Page 158: ...gnal Strength 4 Sync Always set to 1 OK 5 PLL Lock bit indicates that optical wheel is rotating at the correct rate 6 Detector 1 Detector temperature is near setpoint 0 Detector temperature is not nea...

Page 159: ...et the target values for the span gases used to set the span of the instrument CO2 span gas target values are in ppm and H2O span gas target values are entered in C dewpoint The Zero and Span tabs als...

Page 160: ...strength to 100 See CO2 Signal Strength on page 8 7 for more information Coefficients Tab The Coefficients tab displays factory determined calibration coefficients a factor for correcting CO2 measurem...

Page 161: ...ciated with the coefficients When exchanging sensor heads it is necessary to change calibration coefficients and to redo the zero and span Note The easiest way to get the calibration coefficients zer...

Page 162: ...ou can also restore the values from a previous cal ibration by choosing a file in the list and clicking the Restore button Click Delete to permanently remove calibration files from the list stored on...

Page 163: ...ed earlier the coefficients will automatically be loaded 4 Manually enter the Box Pressure calibration coefficients from the Calibration Certificate that came with the sensor head under the Coefficien...

Page 164: ...ions are available only when logging to the USB drive Data can be logged at up to 20 Hz These files can be split into smaller files at 15 30 60 minutes or 1 5 2 4 or 24 hour intervals The files are sp...

Page 165: ...ata all Log Values selected consists of approximately 350 bytes 2800 bits so the max imum output rate at the available baud rates becomes Baud Rate Maximum OutputRate Samplesper Second 9600 2 19200 5...

Page 166: ...the best performance clean the optics if the signal strength is below the upper 90s Signal strength is not an indicator of accuracy because contamination on the optics can affect measurements in unpre...

Page 167: ...og circuit board cannot be checked properly The LI 7550 needs service Head Pressure If not OK the pressure reading at the sensor head is outside of its normal range A service indication can also be ca...

Page 168: ...ion of positive reference voltage used in Auxiliary Input circuit 64830 Aux Ref 16 bit conversion of negative reference voltage used in Auxiliary Input circuit 600 ADC CH1 V Analog input channel 1 5 V...

Page 169: ...LI 7550 temperature 3 5 at room temperature Chopper Temp V Displays voltage of chopper housing temperature control circuit 2 is normal Readings near 0 V or 5 V indicate that the temperature control ci...

Page 170: ...nalyzer s chopping shutter disk Though primarily for LI COR tech nician reference if problems are encountered it may be useful to log the waveform data for troubleshooting pur poses Waveform data can...

Page 171: ...menu s and enter values for the Y Axis maximum and minimum choose Auto Scale if you want the chart to scale the Y Axis automatically to keep data from scrolling off the top or bot tom edges You can al...

Page 172: ...new configuration file with a dif ferent name The analyzer stores its configuration so that it will power on con figured just as it was when it was powered off To open an existing file click on the Co...

Page 173: ...tially different from total pressure P if there are gases present other than i that affect how the ith gas absorbs radiation We rewrite this in terms of number density mol m 3 by introducing a path le...

Page 174: ...r in the absorption band with zero concentration of i present The instrument approximates absorptance by 8 6 where Ai is the power received from the source in an absorbing wavelength for gas i and Aio...

Page 175: ...absorbed and non absorbed power for gas j Equation 8 7 becomes 8 10 Zero Drift Even though the detector and filters are temperature controlled in the LI 7200 RS the detector is subject to slight tempe...

Page 176: ...2O XS on the calibration sheet Ac and Aco are raw signals from the CO2 absorption and reference bands Zwo is the zeroing coefficient H2O Zero on the calibration sheet and Zw is the zero drift coeffici...

Page 177: ...wo are the raw signals for the water absorption and reference bands Zco is the zeroing parameter CO2 Zero Zc is the temperature drift coef ficient CO2 Z on the calibration sheet and Tblock is the bloc...

Page 178: ...Equation H2O mmol m3 H2O number density 8 20 H2O g m3 H2O mass density 8 21 H2O mmol mol H2O mole fraction 8 22 H2O dry mmol mol H2O dry mole fraction 8 23 Dew Point C Dew point temperature 8 24 8 25...

Page 179: ...oken ther mocouple and use only the functioning thermocouple to compute Tcell Pressure is measured by sampling an absolute pressure sensor in the LI 7550 Box Pressure kPa and a fast differential press...

Page 180: ...with an implementation this simple is that the raw signals are a func tion of not only the optical throughput obstructions source and detector aging etc but also temperature Unless one accounts for th...

Page 181: ...et Cx and Wx to values that reflect the reality of your instrument at any point in time The Calibration but ton of the Windows software see Signal Strength Tab on page 7 22 opens a window with a Signa...

Page 182: ...owever most all contamination is not spectrally neut ral and even worse if it is highly spectral very little of it i e small change in Sig nal Strength can have a large effect on your calibration Delt...

Page 183: ...Detail of LI 7550 DSP filter passbands The analog signal conditioning that occurs before the DSP filtering is fixed and may cause a small amount of additional attenuation The frequency response of the...

Page 184: ...Section 8 Theory of Operation 8 12 LI 7200RS Enclosed CO H O Analyzer...

Page 185: ...0 ppm 0 02 typical 0 1 maximum Direct Sensitivity to H2O mol CO2 mol 1 H2O 2 00E 05 typical 4 00E 05 maximum H2O Measurements Calibration Range 0 to 60 mmol mol 1 Accuracy Within 2 of reading Zero Dri...

Page 186: ...Range 10 kPa Accuracy 4 of reading Resolution 0 3 Pa Operating Temperature Range 25 to 50 C 40 C verification on request Relative Humidity Range 0 95 non condensing Data Storage Removable industrial g...

Page 187: ...Gas Analyzer Dimensions Appendix A Specifications A 3 Appendix A Specifications...

Page 188: ...Appendix A Specifications LI 7550 Dimensions A 4 LI 7200RS Enclosed CO H O Analyzer...

Page 189: ...m Inside Diameter 0 21 5 334 mm Wall Thickness 0 020 0 51 mm Length 40 101 6 cm Intake tube path length when assembled 102 cm Intake tube path length with Swagelok filter 106 5 cm Material 304 Stainle...

Page 190: ...tube to long tube Operating Temperature Range 40 C to 50 C Data Communication Protocol RS 485 Intake Tube Inside Diameter 5 33 mm 0 21 Intake Tube Outside Diameter 6 35 mm 0 25 Intake Tube Length 71...

Page 191: ...AUX2 AUX3 AUX3 AUX4 AUX4 5V GND GND GND PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8 PIN 9 PIN 10 PIN 11 PIN 12 WHITE BROWN GREEN YELLOW GREY PINK BLUE RED ORANGE TAN BLACK VIOLET DAC1 DAC2 DAC3 DA...

Page 192: ...Appendix B Pin Assignments B 2 LI 7200RS Enclosed CO H O Analyzer...

Page 193: ...ntific www fishersci com 800 766 7000 770 871 4500 VWR Scientific Products www vwrsp com800 932 5000 908 757 4045 Thomas Scientific www thomassci com 800 345 2100 856 467 2000 GFS Chemicals Inc www gf...

Page 194: ...93 SDM Interface 4 pin male RSS 4 4T 392 10268 Serial 6 pin female to DB 9 female RKC 6T DB9F CS12317 392 10109 Analog In Out 12 pin male RSS 12T 392 10108 Ethernet 8 pin male male RSS RSS841 M 392 10...

Page 195: ...e information NOTE The USB flash drive listed below has been tested by LI COR if you want to use other drives in the LI 7550 please contact LI COR for more information APRO Co Ltd www apro tw com 16GB...

Page 196: ...Appendix C Suppliers C 4 LI 7200RS Enclosed CO H O Analyzer...

Page 197: ...sent followed by a line feed character decimal 10 Each command begins with a left parenthesis and ends with a right parenthesis Some com mands such as BW contain a single value while other commands su...

Page 198: ...by the instrument to package outgoing data The Data command or record might look like this Data CO2D 2 2083146e1 H2OD 3 5485935e2 Temp 2 5886261e1 Pres 9 8157062e1 This record is showing the latest v...

Page 199: ...bcommands Remarks Outputs BW 5 10 20 Sets instrument bandwidth to 5 10 or 20 Hz Delay int Output delay interval 0 to 32 where each interval is 1 150 seconds This is added to the 220 ms system delay Da...

Page 200: ...op 7700Status bool List2 bool Metadata see below 1Data Outputs Ndx Time Date CO2Raw H2ORaw DiagVal DiagVal2 CO2D H2OD Temp AvgTemp TempIn TempOut Pres APres DPres FlowPressure MeasFlowRate VolFlowRate...

Page 201: ...l string instr_1_height float instr_1_wformat uvw polar_w axis instr_1_wref spar axis instr_1_north_offset float instr_2_manufacturer string instr_2_model string instr_2_height float instr_2_north_sep...

Page 202: ...g 150 Hz and ranges from approx imately 2 0E8 to 2 0E8 DiagRec bool Controls whether independent Diagnostic text records are ever sent If TRUE operates normally 1 second or on a change If FALSE never...

Page 203: ...ment Outputs RS232 Freq 1 EOL 0D0A Ndx TRUE DiagRec FALSE DiagVal TRUE Labels TRUE lf Received from the instrument Data Ndx 1545 DiagVal 250 CO2Raw 1 5386712e 1 CO2D 3 2183277e1 H2ORaw 3 5775542e 2 H2...

Page 204: ...ALSE Temp FALSE Aux FALSE CO2Raw FALSE CO2D TRUE H2ORaw FALSE H2OD TRUE Cooler FALSE To configure DAC 1 to output CO2 mole density with this scaling 0V 12 mmol m 3 and 5V 15 mmol m 3 Outputs Dac1 Sour...

Page 205: ...perature of tin and tout C TempIn float Inlet temperature C TempOut float Outlet temperature C Pres float Total pressure kPa Apres float Absolute pressure LI 7550 kPa Dpres float Differential pressure...

Page 206: ...put LPM FlowPower float Flow module voltage output 0 14V FlowDrive float 0 100 H2OAW float H2O Source H2OAWO float H2O Reference H2ORaw float H2O absorptance H2OD float H2O density mmol m 3 H2OMF floa...

Page 207: ...trument to acknowledge any incoming command Val float Only sent after zeroing and spanning commands Contains the new computed value of zero or span Error Received TRUE Sent by the instrument when it c...

Page 208: ...e This software command is normally used when the update frequency is set to zero as shown in the command below Outputs RS232 Freq 0 DiagRec FALSE lf The instrument also supports toggling of the Clear...

Page 209: ...CABLE Function PIN Function Ground PIN 5 Ground Receive Data PIN 3 Transmit Data Request To Send PIN 8 Clear To Send Transmit Data PIN 2 Receive Data Clear To Send PIN 7 Request To Send Data Terminal...

Page 210: ...r the slope and intercept are applied B float Name string Units string Aux2 A float B float Name string Units string Aux3 A float B float Name string Units string Aux4 A float B float Name string Unit...

Page 211: ...quoted string The date field triggers the instrument to do a zero immediately The new value will be returned in an Ack record SpanCO2 Span2CO2 SpanH2O Span2H2O Val float For setting the span directly...

Page 212: ...oat XS float Z float SD1 float SD2 float SD3 float Pressure A0 float A1 float MaxRef B float C float Examples 1 To set the CO2 zero right now with CO2 free gas flowing though it of course send this Ca...

Page 213: ...panel Table D 5 Synchronization Commands The Network Command The Name can only include upper and lower case letters A to Z and a to z num bers 0 to 9 the dash character and the period Names that do n...

Page 214: ...0 1 0 Flow On 1 Flow Off SetFlowRate float Set flow module output SLPM MeasFlowRate float Read Only Measured flow module output SLPM FlowPressure float Read Only Flow module pressure kPa 0 5 kPa FlowP...

Page 215: ...query Outputs RS232 Freq lf would respond Outputs RS232 Freq 5 whereas the query Calibrate lf causes a Calibrate record to be put in the output queue Example Response Calibrate ZeroCO2 Val 0 8945 Date...

Page 216: ...uts lf causes a Outputs record to be put in the output queue Example Response Outputs BW 10 Delay 0 SDM Address 7 Dac1 Source NONE Zero 5e 2 Full 4e 1 Dac2 Source PRESSURE Zero 1e 1 Full 4e 1 RS232 Ba...

Page 217: ...record to be put in the output queue Example Response Inputs Pressure Source Measured UserVal 9 8000002e1 Temperature Source Measured UserVal 2 5000000e1 Aux A 1 B 0 MeteoDevices Biomet Station Comman...

Page 218: ...ing Communications Step by Step 1 Set a break condition on the RS 232 line 500 ms should be sufficient The instrument will cease normal activity change its baud rate to 9600 baud and begin to send asc...

Page 219: ...amaged by act of God or other casualty 4 The purchaser whether it is a DISTRIBUTOR or direct customer of LI COR or a DISTRIBUTOR S cus tomer packs and ships or delivers the instrument to LI COR Inc at...

Page 220: ...whether included by this contract or by law are limited to the time period of this warranty which is a twelve month period commencing from the date the instru ment is shipped to a user who is a custo...

Page 221: ...ngths C 2 Calculations 8 4 Calibration 4 5 7 21 coefficients 7 22 history 7 24 restore 7 24 Cell Pressure 8 7 Cell Temperature 8 7 Charts 7 33 Chopper Housing Temperature 7 8 Cleaning optics 5 3 Clock...

Page 222: ...ion 7 14 Express Processing 3 48 F File Compression 3 20 3 45 3 45 Filter 2 9 Flow Module window 3 31 Formulas 8 6 Fuse 5 15 replacing 5 9 G GHG file defined 3 6 GHG Software 3 1 update 5 11 GPS clock...

Page 223: ...ion 3 3 Signal Processing 8 11 Signal Strength 7 22 8 7 delta 8 10 SmartFlux 2 advanced mode 3 48 clock 3 19 configuration file 3 56 connect 3 38 Soda Lime 5 4 Software Update GHG 5 11 LI 7200RS 5 11...

Page 224: ...3 45 V vertical separation 3 30 3 35 W Windows Software 3 1 Winter Setting 7 8 X XML D 1 D 2 D 8 example commands D 15 sending commands 7 7 Z Zero checking 4 2 command D 15 stability 4 1 Appendix F I...

Page 225: ......

Page 226: ...al Offices LI COR Biosciences GmbH Siemensstra e 25A 61352 Bad Homburg Germany Phone 49 0 6172 17 17 771 envsales gmbh licor com LI COR Biosciences UK Ltd St John s Innovation Centre Cowley Road Cambr...

Reviews:

No comments

Brands by name

Popular brands

Load more brands