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LI-COR LI-710 Instruction Manual

Evapotranspiration sensor
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LI-710
Evapotranspiration
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Instruction Manual

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  • Page 1 LI-710 Evapotranspiration Sensor Instruction Manual...
  • Page 3 LI-710 Evapotranspiration Sensor Instruction Manual LI-COR Biosciences 4647 Superior Street Lincoln, Nebraska 68504 Phone: +1-402-467-3576 Toll free: 800-447-3576 (U.S. and Canada) envsales@licor.com Regional Offices LI-COR Biosciences GmbH Siemensstraße 25A 61352 Bad Homburg Germany Phone: +49 (0) 6172 17 17 771 envsales-gmbh@licor.com...
  • Page 4 Notes on Safety This LI-COR product has been designed to be safe when operated in the manner described in this manual. The safety of this product cannot be assured if the product is used in any other way than is specified in this manual. The product is intended to be used by qualified personnel.
  • Page 5 CE Marking: This product is a CE-marked product. For conformity information, contact LI-COR Support at envsupport@licor.com. Out- side of the U.S., contact your local sales office or distributor. California Proposition 65 Warning WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

  • Page 7: Table Of Contents

    Height above the canopy Terrain, slope, and tilt Mounting the LI-710 Horizontal cross bar Vertical pipe and T-post Section 3. Overview of SDI-12 and the LI-710 Wiring the sensor Common commands The XT (trigger) command Default settings Section 4. Using an SDI-12-to-USB translator...
  • Page 8 Communicating with a command-line interface Use transparent mode Get the address Device information Set the address Adding a variable set to a scheduled output Turn off or on the scheduler Report the measurement immediately Logging data to your computer Section 5. Connecting to Campbell Scientific dataloggers Requirements for this tutorial Configuring the datalogger Retrieving logged data...
  • Page 9 Addressing diagnostic codes Section 9. Maintenance Basic sensor checkup Replacing the intake filter Replacing the air pump Accessing the exhaust vent Updating the firmware Section 10. Specifications Standard Terms and Conditions...
  • Page 10 viii...

  • Page 11: Section 1. Introduction To The Li-710

    The LI-710 Evapotranspiration Sensor measures the total transport of water from evaporation and transpiration over an area using automated eddy covariance flux cal- culations. The output from the LI-710 is evapotranspiration, energy flux, and other parameters in 30-minute increments. It uses the SDI-12 protocol to transfer data to an external data recorder.

  • Page 12: What's What

    (see Deploying the LI-710 on page 2-1 for more information). What's what If you have just received your LI-710, check the packing list to be sure you have everything that you ordered. The LI-710 may include some or all of the following components.

  • Page 13: Replacement Parts

    25-meter extension cable with weather-resistant connectors on each end. Extends the Part number 392-20529 data/power cable for a total length of 30 meters. Crossover fitting The LI-710 can mount to a horizontal cross bar (1¼" outside diameter) with a ¾" × Part number 259-13276 1" crossover fitting. Replacement parts...

  • Page 14: Swivel Mount

    Section 1. Introduction to the LI-710 Swivel mount The LI-710 can mount to a vertical mast (1" outside diameter) with a ¾" swivel Part number 259-13275 mount. Mounting kit with riser bar The mounting kit includes a crossover fitting (¾" × 1"), swivel mount (¾"), and a 56...

  • Page 15: Section 2. Deploying The Li-710

    Figure 2-1. Protective caps should be removed before powering on the sensor. Deployment considerations The LI-710 can be deployed as a stand-alone sensor, in a weather station, or as part of an eddy covariance flux station. There are a few considerations that will help ensure that the data you collect accomplishes your measurement goals.

  • Page 16: Area-Of-Interest

    If you have to choose a side, choose the side that is downwind of the prevailing wind over the area-of-interest. Note: If the LI-710 is installed in the middle of the area-of-interest, footprint information is not critical for interpreting the data. In cases where the footprint is required, you should collect horizontal wind information and calculate the foot- print using your own methods.

  • Page 17: Distance From Surrounding Elements

    100 to 200 meters around the device. Figure 2-4. Where the LI-710 cannot be deployed in an area-of-interest, it can be positioned at the edge on the downwind side. At a height of 2 meters above the canopy, assume a 100 to 200 meter area-of-interest in the upwind direction.

  • Page 18: Height Above The Canopy

    Figure 2-5. The LI-710 can be installed at a fixed position over crops. Install it at a height that is at least 2 meters above the expected canopy height. Alternatively, you can raise the LI-710 as the crop grows to maintain a consistent height for the season.
  • Page 19 Over orchards and woodlands, which are characterized by partial to full canopy clos- ure, the LI-710 should be at least 2 meters above the top of the canopy. Figure 2-7. The LI-710 should be at least 2 meters above the top of orchards, woodland, and forest canopies.

  • Page 20: Terrain, Slope, And Tilt

    Figure 2-8. On sloped terrain, install the LI-710 perpendicular to the predominant slope of the area-of-interest. A few degrees of difference is acceptable. Figure 2-9. On level ground, install the LI-710 with 0° tilt, although a few degrees of dif- ference is acceptable.

  • Page 21: Mounting The Li-710

    Section 2. Deploying the LI-710 Mounting the LI-710 The LI-710 can be deployed as a stand-alone sensor, in a weather station, or as part of an eddy covariance flux station. It mounts readily to hardware that is common to irrigation infrastructure, weather stations, and other equipment.

  • Page 22: Vertical Pipe And T-Post

    For a stand-alone installation, the LI-710 can be attached to a T-post and vertical mast, like a piece of pipe. The LI-710 can attach to a pipe using a swivel mount, or the post can be installed inside a pipe that has an inside diameter >1 inch (2.54 cm) and a means to secure the post (Figure 2-11 below).

  • Page 23: Section 3. Overview Of Sdi-12 And The Li-710

    SDI-12-to-USB translator. Wiring the sensor The LI-710 is powered by over the brown wire (9 to 33 VDC). Data are transferred over the blue DATA wire. The black wire connects to ground. Figure 3-1. Wires from the LI-710 connect to power and an SDI-12 data bus.

  • Page 24: The Xt (Trigger) Command

    Section 3. Overview of SDI-12 and the LI-710 Use the XT command every 30 minutes to instruct the LI-710 to begin recording for a 30-minute measurement period. This ensures that data are aligned in time for every measurement period, and it prevents drift in the sampling period.

  • Page 25: Section 4. Using An Sdi-12-To-Usb Translator

    (see Figure 4-2 on the next page). Connecting the device Connect the wires and power on the LI-710, then connect the USB cable to your computer. The computer will establish a COM port, which may be indicated in the notifications or found in the Device Manager.
  • Page 26 Section 4. Using an SDI-12-to-USB translator Figure 4-2. When connecting the LI-710 to an SDI-12-to-USB translator, connect the data wire to the BUS terminal and the ground wire to both GND and power ground. Connect the power and ground leads to a power supply (12 VDC).

  • Page 27: Communicating With A Command-Line Interface

    The number in the reply (0 in this case) is the connected sensor's address. Device information Each LI-710 is configured with an address of 0. The first time you connect to an LI-710, it should be the only device attached to the SDI-12 array. After connecting initially, you can set the address and then power up the remaining SDI-12 devices.

  • Page 28: Set The Address

    OK DATA 0:0 To add four groups of variables, send the following four commands: Command: ADD 0:0,60,0,0 Command: ADD 0:1,60,0,0 Command: ADD 0:2,60,0,0 Command: ADD 0:3,60,0,0 To remove a group for example, send the following. LI-710 Evapotranspiration Sensor Instruction Manual...

  • Page 29: Turn Off Or On The Scheduler

    Section 4. Using an SDI-12-to-USB translator Command: DEL 0:3 Reply: This will remove variable group 4 from the output of sensor 0. Use a modified ver- sion of the same command to remove variable groups 0, 1, 2, 3, or 4. Adding the data set to the scheduler is not enough;...

  • Page 30: Logging Data To Your Computer

    The logging options in Tera Term are somewhat limited compared with those avail- able in dedicated data loggers. But, if your goal is to record the data, this will get it done for a short time period. LI-710 Evapotranspiration Sensor Instruction Manual...

  • Page 31: Section 5. Connecting To Campbell Scientific Dataloggers

    LI-710 to a CR1000X, CR1000, CR300, CR6, or CR5000 datalogger. The programs described here will read data from the LI-710 only. If you want to add the LI-710 to an existing program, the task is more complicated. Campbell Scientific can provide the technical assistance that is required for modifying datalogger pro- grams beyond what is described here.

  • Page 32: Configuring The Datalogger

    C1, which is labeled on the logger and specified in the pro- gram as the SDI-12 terminal for this sensor. Figure 5-2. The LI-710 connects to a 12 VDC power supply (brown), ground (black), and an SDI-12 terminal (blue to C1 in this example).
  • Page 33 The sample programs use an address of as well, and are compatible with the LI-710 in its default configuration. If you need to change the sensor address, we describe that in The PC400 terminal pro- gram on page 5-6. If you change the address, you must also modify the program as well (you can do this easily in a text editor).
  • Page 34 Section 5. Connecting to Campbell Scientific dataloggers Click to dismiss the warning; allow the logger to compile the program. The datalogger will restart; reconnect after it restarts. Click to view the latest results. Monitor Data LI-710 Evapotranspiration Sensor Instruction Manual...

  • Page 35: Retrieving Logged Data

    Section 5. Connecting to Campbell Scientific dataloggers Retrieving logged data The datalogger stores the readings to it's internal memory. To copy the data to your computer: Click to save the logged data to a file on your computer. Start Data Collection Select an output file and click The directory is indicated in the column called Output File Name...

  • Page 36: The Pc400 Terminal Program

    Section 5. Connecting to Campbell Scientific dataloggers The PC400 terminal program The PC400 has a built-in terminal emulator that you can use to communicate with the LI-710. To use it, connect with the datalogger as described earlier and follow these steps: In PC400, click Datalogger >...

  • Page 37: Get Information

    CR5000, or CR6 Datalogger. This example includes comments to show you which parameters can be modified. Listing 5-1. A program for Campbell Scientific, Inc. CR1000X, CR1000, CR5000, or CR6 datalogger. 'LI-710 simple logger 'Rev: 0.1 'Date: May 23, 2023 'Author: licor.com...
  • Page 38 'specifies the interval for scanning for new data SDI12Recorder(LI710A,C1,0,"XT!",1.0,0) 'instructs the SDI- 12 device on terminal C1 to start sampling SDI12Recorder(LI710A,C1,0,"M0!",1.0,0) 'requests group 0 (M0) from the SDI-12 device on terminal C1     CallTable LI710group0   NextScan LI-710 Evapotranspiration Sensor Instruction Manual...

  • Page 39: Section 6. Connecting To The Sutron 9210 Datalogger

    12 protocol. This tutorial and program provide the basic steps for accomplishing this with a Sutron 9210 datalogger. If you want to add the LI-710 to an existing pro- gram, the task may be more complicated. Contact Sutron technical support for assist- ance.

  • Page 40: Configuring The Datalogger

    Connect the brown wire to a +12 VDC power supply and the black wire to the ground. Connect the blue wire to the DATA terminal. Figure 6-2. The LI-710 connects to a 12 VDC power supply (brown), ground (black), and an SDI-12 terminal (blue).
  • Page 41 Section 6. Connecting to the Sutron 9210 datalogger Load the configuration file onto the datalogger. Click , select the file, and click to add it to the list. File Transfer ==> After the transfer is complete, dismiss the window. Click and set the Setup Access Station Name...
  • Page 42 . The most recent results will Sensors Meas be presented. If the LI-710 has been on for less than 30 minutes, data will be place- holder values of -9999. After the first 30 minutes has passed, actual measurements are presented.

  • Page 43: Retrieving Logged Data

    Section 6. Connecting to the Sutron 9210 datalogger Figure 6-3. Measurements are presented in the tab. Sensors Retrieving logged data After data are logged to the datalogger internal memory, you can copy the data files to your computer. Here's how: Connect a computer to the datalogger using an RS-232-to-USB adapter or another method.
  • Page 44 Section 6. Connecting to the Sutron 9210 datalogger Select the options. Format Download Set the if needed. Start Time End Time Select a directory on your computer and save the files. LI-710 Evapotranspiration Sensor Instruction Manual...

  • Page 45: More Sdi-12 Options

    Section 6. Connecting to the Sutron 9210 datalogger More SDI-12 options You can read information from the sensor in the Xterm program. This might be use- ful for troubleshooting or configuring the device initially. Connect with the device and select the tab (Figure 6-3 on page 6-5).

  • Page 46: Set The Address

    We start with a sensor address of Select the current address in the first field. Enter the command into the second field. Click and click through the prompts. Send The sensor replies with the new address. LI-710 Evapotranspiration Sensor Instruction Manual...

  • Page 47: Section 7. Data And Variables

    The LI-710 sends up to four packets of results, each including up to nine variables. Group 0: Results Group 0 is the main set of measurements, including actual evapotranspiration, a set of measured and computed parameters, the sequence number, and diagnostic information for the measurement period.

  • Page 48: Group 1: Results And Sample Count

    Precision Actual Evapotranspiration Latent Energy Flux Heat Flux Atmospheric Pressure Air Temperature (not sonic) °C Relative Humidity Ambient percent Sequence Number Sample Count SAMP_CNT # (up to 18000) Diagnostic Value DIAG # (0 - 65535) LI-710 Evapotranspiration Sensor Instruction Manual...

  • Page 49: Group 2: Air, Humidity, And Instrument Information

    (0 - 180) Group 3: Performance information and diagnostics Group 3 includes diagnostic and performance information for the LI-710. The Data QC parameter may be of interest. It indicates how many points were discarded in the processing of the raw data. A high percentage of excluded data indicates that the measurement has poor quality.
  • Page 50 Section 7. Data and variables LI-710 Evapotranspiration Sensor Instruction Manual...

  • Page 51: Section 8. Troubleshooting

    LI-710 performance over that time period. You can use this to identify an issue that can be addressed by servicing the LI-710. This is the diagnostic value recorded as the ninth variable in data Group 0 and Group 1.
  • Page 52 Addressing diagnostic codes Some diagnostic codes are simply for your information - there is nothing to do besides know what the code indicates. For example, if the LI-710 measures freezing temperatures or persistent high humidity, it stop measurements. You can assume that evapotranspiration is near zero in these conditions.
  • Page 53 This might be resolved by cleaning the trans- ducers, or it might require additional investigation (start by cleaning the trans- ducers). If your are unable to resolve a code, contact LI-COR or your sales representative. Addressing diagnostic codes...
  • Page 54 Section 8. Troubleshooting LI-710 Evapotranspiration Sensor Instruction Manual...
  • Page 55 Section 9. Maintenance The LI-710 requires little maintenance under normal circumstances. However, some routine attention will ensure that the instrument keeps running well over the long term, and will help you get better, more complete measurements. Basic sensor checkup You can conduct a basic check just by looking at the LI-710.
  • Page 56 (part number 6371-021). The intake filter is on the bottom of the lower transducer housing. Power off the LI-710 - disconnect the cable. Align the intake removal tool with the keys on the air intake and turn it counterclockwise.
  • Page 57 Section 9. Maintenance Install a new filter and O-ring from the spares kit. Insert the filter into the air intake, followed by the O-ring. Install the air intake. Do not cross-thread the air intake. Start tightening the intake with your fingers. Fin- ish tightening it with the tool until it hits a hard stop - around 2 turns clockwise.
  • Page 58 Section 9. Maintenance Replacing the air pump The pump inside the LI-710 has a limited life and will need to be replaced peri- odically. One replacement pump is included with the instrument spares. Additional pump replacement kits are available for purchase. This procedure describes how to replace the pump.
  • Page 59 Section 9. Maintenance Remove the flow assembly. Remove the four screws using the 2.5 mm hex key from the spares kit. Pull straight up while gently wiggling the flow assembly to separate it from the connector pins. Important: Do not bend the connector pins or remove any other screws. Remove the old pump.
  • Page 60 Extra screws are in the spares kit (part number 151-18159). Install the cover. Tighten the cover until it hits a stop and will no longer turn - about two revolutions. The pump replacement is complete. LI-710 Evapotranspiration Sensor Instruction Manual...
  • Page 61 Section 9. Maintenance Accessing the exhaust vent Disconnect the power cable and then remove the cover to access the exhaust vent. Figure 9-1. Remove the cover to access the exhaust vent. The vent is between the post and the sensor body. Do not remove the post or loosen the screws that secure it.
  • Page 62 Copy the file you downloaded into the FW_UPDATE directory. When the LI-710 "notices" the new file, it will automatically close the window and initiate the update. You may see a message indicating that the update was successful. Disconnect the power and USB cables and install the electronics cover.
  • Page 63 Mounting Height: >2 meters above the plant canopy Mounting Hardware: 1 inch (2.54 cm) diameter post Ingress Protection: Tested to IEC IP54 Weight: 1.4 kg Dimensions: 58 × 17.5 × 7.7 cm (H × L × W) LI-710 Evapotranspiration Sensor Instruction Manual 10-1...
  • Page 64 Latent Energy Flux W/m^2 Sensible Heat Flux W/m^2 Vapor Pressure Deficit Atmospheric Pressure Air Temperature °C Relative Humidity Ambient Absolute Humidity Ambient g/m^3 Saturated Vapor Pressure Ambient Dewpoint °C Specifications subject to change without notice 10-2 LI-710 Evapotranspiration Sensor Instruction Manual...
  • Page 65 Buyer will be deemed to have assented to these Conditions upon Buyer’s placement of order. Notwithstanding the above, failure of LI-COR to object to provisions contained in any purchase order or other form or document from Buyer shall not be construed as a waiver of these Conditions nor an acceptance of any such provision.
  • Page 66 INCOTERMS 2000 designated by LI-COR. LI-COR title to the Products and the risk of loss of or damage to the Products ordered by the Buyer will pass to Buyer at time of LI-COR delivery of Products to the carrier. The carrier shall be deemed Buyer’s agent, and any claims for damages in shipment must be filed with the carrier.
  • Page 67 LI-COR. LI-COR may assign or transfer these Conditions to any successor by way of mer- ger, acquisition or sale of all or substantially all of the assets relating to these Conditions. LI-COR or any successor may assign all or part of the right to payments under these Conditions.
  • Page 68 LI-COR suppliers or subcontractors, transportation difficulties, customs clearance, shortage of energy, raw materials or equipment, or Buyer’s fault or negligence. In the event of any such delay the date of delivery shall, at the request of LI-COR, be deferred for a period equal to the time lost by reason of the delay.
  • Page 70 Regional Offices LI-COR Biosciences GmbH Siemensstraße 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 Cambridge CB4 0WS United Kingdom Phone: +44 (0) 1223 422102 envsales-UK@licor.com LI-COR Distributor Network: www.licor.com/envdistributors...

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