Overview of the instrument

The LI-7500DS is a high performance open-path CO2/H2O analyzer designed for use in eddy covariance flux measurement systems. It features simultaneous, high-speed measurements of CO2 and H2O in the free atmosphere. With the SmartFlux 3 System and a sonic anemometer, the instrument constitutes a complete eddy covariance system. This combination of instruments is used to measure the exchange of gas and energy between the terrestrial earth and the atmosphere using the eddy covariance method.

Note: The LI-7500DS head cannot be connected to the LI-7550 or original LI-7500 control box. The measurement principles, however, are identical.

What's what

If you have just taken delivery of your instrument, check the packing list to verify that you have received everything that was ordered.

LI-7500DS sensor head

Part Number: LI‑7542

The sensor head is the gas analyzer. It includes the optics, an air temperature thermistor, and electronics.

Digital system interface box

Part Number: 7500-300

The Digital System Interface (DSI) box houses the digital signal processor, networking hardware, instrument clock, and pressure sensor. It has a 2-meter cable to connect to the analyzer head. There are power and status LEDs on the box.

Gas analyzer data cable

One data cable is required for the LI-7500DS. Cables, which feature an 8-pin Eurofast-to-RJ45 connector, are available in 5-, 25-, and 50-meter lengths.

Description Part Number
5 meter data cable 392-13977
25 meter data cable 392-16699
50 meter data cable 392-13767

Gas analyzer power cables

The power cable connects the DSI box to a power supply (9 to 34 VDC). Power cables are available in 5- and 25-meter lengths.

Description Part Number
5 meter power cable 9975-030
25 meter power cable 9975-056

Gas analyzer accessories

The following accessories are available for the instrument. Some components are included with the instrument; others are sold separately as indicated.

Head mounting post

Part Number: 9975-010

Included with the instrument. The mounting post is to mount the LI-7500A/RS/DS head in a ¾" swivel mount or the combination mount. It has blue dampers that protect the instrument from vibrations.

Mounting post for the LI-7500, LI-7500RS, and LI-7500DS gas analyzers

Head mounting kit

Part Number: 7900-340

Available as an option. The head mounting kit is used to install the gas analyzer head on a cross arm.

Table 1‑1. The gas analyzer head mounting kit (7900-340) and components.
Description Quantity Part Number
Swivel Mount (¾") 1 7900-344
56 cm Riser Bar (¾" IPS) 1 9879-046
Crossover Fitting (¾" × 1") 1 7900-342
Figure 1‑1. The head mounting kit has a ¾" × ¾" swivel mount (left), 56 cm by ¾" IPS riser bar (middle), and a ¾" × 1" crossover fitting (right).

Combination mount for LI-7500A/RS/DS and WindMaster/Pro

Part Number: 7900-320

Available as an option. The combination mount is used to mount a Gill WindMaster/Pro or R3-50 sonic anemometer with an LI-7500A/RS/DS. It positions the gas analyzer next to the anemometer.

Description Quantity Part Number
Bolts (M6 x 35) 3 150-16757
Flat washers (A6) 6 159-15104
Star lock washers (J6) 3 159-16756
Hex Nuts (M6 x 35) 3 157-15095
Figure 1‑2. The combination mount attaches to the WindMaster/Pro mounting post.

DSI box mounting bracket

Part Number: 9875-061

Mounting bracket for the DSI box. Includes band clamps and a bracket.

Carrying case

Part Number: 7500-01

The carrying case holds the gas analyzer, Digital System Interface box and cables. Always put the analyzer in the case when transporting it.

Gas analyzer calibration kit

Part Number: 9975-054

The calibration kit is required if you want to check the instrument calibration using calibration gases. It includes calibration shroud and a thermistor to measure temperature of the sample air.

Calibration certificate

The certificate lists the calibration coefficients for your sensor head. These values are unique to each sensor head and have been entered into the software at the factory. Keep this sheet in case you need to verify these values. Calibration certificates are available from the LI-COR support site.

The SmartFlux® 3 System

Part Number: 7900-610

The SmartFlux 3 System houses the datalogging and processing computer. It provides GPS position and time synchronization, connections for digital sonic anemometer data, a USB port for logging data to a USB storage device, and a microcomputer that runs EddyPro Software.

  • USB Port: Hosts a USB drive for data logging.
  • USB Status LED: Indicates data transfer status.
    • Solid: Normal operation.
    • Rapid Blink: Logging or reading data.
    • Slow Blink: Error. Eject and reinsert the drive.
  • USB Eject Button: Press to eject the drive. Failure to press the eject button before removing the USB flash drive may result in the loss of data.
  • Digital I/O Terminals: These three ports can read digital data from a sonic anemometer and a LI-COR Data Acquisition System. Each digital I/O port has two LEDs that are visible at the top of each connector:
    • RX LED (receiving) and TX LED (transmitting):
      • Rapid Blink or On: Receiving or transmitting data.
      • Off: Normal operation; waiting.
  • GPS Antenna Connector: Accepts the GPS antenna cable. When connected, time and location data can be set by GPS satellites.
  • Ethernet Connector: Standard RJ45 jack for an Ethernet cable. Connects to a port on the Brainboxes SW-508.
  • Power In Connector: Requires a 10 to 30 VDC power supply capable of providing 3.5 W.
  • Reset Button: Press to reboot the SmartFlux System.
  • Indicator LEDs: In addition to the digital I/O port LEDs and USB status LEDs, the SmartFlux System has four status LEDs:
    • Power IN ():
      • Solid: System is powered.
      • Off: System not powered.
    • Power OUT ():
      • Solid: Power delivered to digital I/O ports 1, 2, or 3, on pins 1 and 2.
      • Off: Power not delivered. If Power IN is on, but Power OUT is off, then a fuse inside the SmartFlux System has failed.
    • Ethernet Activity ():
      • Rapid Blink or On: Network communication.
      • Off: No network communication
    • Status ():
      • Slow Blink: System is ready.
      • Solid: Starting up.

The SmartFlux 3 System includes the following components:

Description Quantity Part Number
16 GB USB Drive 1 616-10723
GPS Antenna with Mounting Bracket and 5 m cable 1 9979-035
GPS Mounting Bolt, Hex Head 5/16-24 x 3/4" 1 140-16077
GPS Mounting Nut, Hex Head 5/16-24 1 163-16076
Ethernet Cable, 30 cm 1 616-16844
Power Supply Wires, red and black, 18 AWG, 25 cm 1 each 9579-004
Power Terminal Strip, 4 Pin 1 331-13569
Data Input Terminal Strip, 9 Pin 2 331-15376
Data Input Terminal Strip, 11 Pin 1 331-15378

Brainboxes SW-508 network switch

Part Number: 616-16771

8-port unmanaged network switch with power wires. Expands the number of Ethernet connections available. Complete documentation for the switch is available from brainboxes.com.

Caution: Do not use network switches other than the Brainboxes SW-508. Other network switches may provide undependable network performance that could result in data loss.

Software

Several software applications are available for the LI-7500DS, including the Windows application software, embedded instrument firmware, EddyPro Software, and other applications. Go to licor.com/7500ds-software for the latest versions. Update the instrument firmware before deploying it.

Windows interface application software

The Windows interface software is used to configure the gas analyzer and SmartFlux System and set parameters for the eddy covariance system. It is compatible with Windows computers running Windows 7 and newer operating systems.

EddyPro® Software

EddyPro Software for the desktop (macOS or Windows) is not required to use the instrument because EddyPro is installed on the SmartFlux System. The EddyPro desktop application is required if you want to run an advanced configuration on the SmartFlux System or if you want to reprocess eddy covariance raw data.

File viewer software

The File Viewer is a simple application for viewing raw data from LI-COR sensors. It reads compressed data files and displays plots of the data.

FluxSuite® Software

FluxSuite is a web-based application that enables you to monitor LI-COR eddy covariance systems that are connected to the internet through a direct Ethernet connection, cellular gateway, or satellite internet terminal. FluxSuite provides site status information, summary results, and configurable email alerts regarding site status. See licor.com/fluxsuite/ for details.

Tovi® Software

Tovi is a suite of tools for analyzing eddy covariance flux and meteorological datasets that have been processed with EddyPro Software. Tovi is designed to bring together analysis tools, developed by or with the scientific community, into a unique, interactive and intuitive environment, to facilitate and streamline typical processes such as quality control, flux gap filling and flux partitioning, as well as to enable novel analysis such as footprint-based flux allocation. Go to licor.com/tovi for more information.

Enclosures and accessories

Electronics enclosures are available as accessories for the system.

Pre-configured biomet system enclosure

Part Number: 7900-126

The pre-configured enclosure is a large weather resistant box with mounting hardware. It is set up for the LI-COR Biomet Data Acquisition System and other accessories. It includes all of the terminal connections and DIN rails required for a complete eddy covariance system.

Table 1‑2. Components included with the enclosure. Many of these parts are installed in the enclosure prior to delivery.
Component Qty. Part Number
10-amp Circuit Breaker; DIN Mountable 2 275-13499
Red 1-tier Terminals; DIN Mountable 8 331-12822
Gray 2-tier Terminals; DIN Mountable 3 331-12885
Blue 2-tier Terminals; DIN Mountable 4 331-12959
Red 4 mm Terminals; DIN Mountable 3 331-13508
Green 4 mm Terminal; DIN Mountable 1 331-13510
Black 4 mm Terminals; DIN Mountable 3 331-13511
4-position Shorting Blocks 2 331-17204
3-position Shorting Blocks; 4 mm 2 331-16821
2-position Shorting Blocks 2 331-13646
DIN Terminal Covers 5 331-12825
DIN End Bracket 4 331-12922
DIN Terminal Labels 2 331-12934
Adhesive Cable Tie Mounts 5 218-03683
Phillips Pan Head Screw (10-32; 3/8") 4 122-00072
Risers to mount the battery 2 9879-090
Riser Plate 1 9879-091
Raised Terminal Block and DIN Mount 1 6579-078
DIN Rail (14 cm) 4 6579-079

Eddy covariance system enclosure

Part Number: 7900-050

A basic enclosure with a minimal set of internal components. Includes a pre-drilled internal back plate, three DIN rails for mounting components, and three strain relief fittings. It is best to pair this with the Power Distribution Kit (7900-235).

Power distribution kit

Part Number: 7900-235

Includes DIN-mountable terminal connections, shorting blocks, and a 10-amp circuit breaker. Provides 11 individual positive and negative power terminals for the system. Installs in the 7900-050 eddy covariance system enclosure.

Description Quantity Part Number
10-amp Circuit Breaker; DIN Mountable 1 275-13499
DIN Terminal Cover 1 331-12825
DIN Terminal End Bracket 2 331-12922
Red 4 mm Terminals; DIN Mountable 6 331-13508
Green 4 mm Terminals; DIN Mountable 1 331-13510
Black 4 mm Terminals; DIN Mountable 6 331-13511
6-position Shorting Box 2 331-13512
14 AWG Red Wire Lead 1 392-13829
18 AWG Green/Yellow Ground Wire Lead 1 372-04621

Sonic anemometer cables and mounting hardware

Optional data and power cables are available for all supported anemometer models. Mounting hardware is available for several models.

Gill WindMaster/Pro and R3

Data and power cables

Part Number: 7900-415-x

The data/power cable is available in three lengths. The USB-to-RS-422 cable is used to connect the anemometer to a computer.

Table 1‑3. WindMaster/Pro power and data cables that are compatible with the SmartFlux 2 and 3 Systems.
Cable Type Length Part Number
Data and Power 5 m 7900-415-5
Data and Power 25 m 7900-415-25
Data and Power 50 m 7900-415-50
USB to RS-422 1.8 m 392-16348

Mounting hardware

Part Number: 7900-342

To mount the WindMaster/Pro and R3, use a ¾" × 1" cross-over fitting (7900-342) and anemometer mounting post (900-11242). The mounting post is included with WindMaster/Pro anemometers purchased from LI-COR. The cross-over fitting is available seperately.

Description Quantity Part Number
WindMaster/Pro Mounting Post 1 900-11242
Crossover Fitting (¾" × 1") 1 7900-342
Gill WindMaster Mounting post and crossover fitting
Figure 1‑3. Mounting post (left) and crossover fitting (right) are to install a WindMaster/Pro or R3 anemometer.

Gill HS-50 and R3-50

Data and power cables

Part Number: 7900-445-x

The data/power cable is available in three lengths. The USB-to-RS-422 cable is used to connect the anemometer to a computer.

Table 1‑4. Power and data cables to connect Gill HS-50 or R3-50 anemometers with the SmartFlux 2 or 3 System.
Cable Type Length Part Number
Data and Power 5 m 7900-445-5
Data and Power 25 m 7900-445-25
Data and Power 50 m 7900-445-50
USB to RS-422 1.8 m 392-16348

HS-50 Mounting hardware

The HS-50 can be mounted with the following components. The R3-50 mounting options are similar to the WindMaster/Pro. Mounting is accomplished with two hardware packs. Use the two 35 mm U-bolts from each cross arm hardware pack. The larger 64 cm U-bolts are not used.

Description Quantity Part Number
Crossover Fitting (1" × 1") 1 259-17893
45 cm Riser Bar (1" IPS) 1 9879-095
Cross-arm Plate 1 9879-020
Cross-arm Brackets 4 9879-043
Cross-arm Hardware Pack 2 9979-018
Cross arm hardwareRiser bar Cross over fitting

Campbell Scientific CSAT3

Part Numbers: 7900-454-x and 7900-452-x

Data and power cables are available in two lengths. The USB-to-RS-232 cable is used to connect the anemometer to a computer.

Table 1‑5. CSAT3 power and data cables that are compatible with the SmartFlux 2 and 3 Systems.
Cable Type Length Part Number
RS-232 Data 5 m 7900-454-5
Power 5 m 7900-452-5
RS-232 Data 50 m 7900-454-50
Power 50 m 7900-452-50
USB to RS-232 1.8 m 392-16347

Campbell Scientific CSAT3B

Part Numbers: 7900-464-x and 7900-462-x

Data and power cables are available in two lengths.

Table 1‑6. CSAT3B power and data cables that are compatible with the SmartFlux 2 and 3 Systems.
Cable Type Length Part Number
RS-485 Data 5 m 7900-464-5
Power 5 m 7900-462-5
RS-485 Data 50 m 7900-464-50
Power 50 m 7900-462-50

Metek MultiPath Class A

Data and power cables

Part Number: 7900-492-x

The data/power cable is available in three lengths. The USB-to-RS-232/RS-485 cable is used to connect the anemometer to a computer.

Table 1‑7. Metek Class-A power and data cables that are compatible with the SmartFlux 2 and 3 Systems.
Cable Type Length Part Number
Data and Power 5 m 7900-492-5
Data and Power 25 m 7900-492-25
Data and Power 50 m 7900-492-50
USB to RS-232/RS-485 1.8 m 392-16348

Mounting kit

Part Number: 7900-336

Mount the Metek Class A anemometer with the Metek mounting kit (7900-336).

Table 1‑8. The Metek Class A mounting kit and components.
Description Quantity Part Number
Crossover Fitting (1" × 1") 1 259-17893
45 cm Riser Bar (1" IPS) 1 9879-095
Cross-arm Plate 1 9879-020
Cross-arm Brackets 2 9879-043
Cross-arm Hardware Pack 1 9979-018
mounting kitRiser bar cross-over fitting
Figure 1‑4. The cross-arm plate with brackets, riser bar, and crossover fitting used to mount a Metek Class A sonic anemometer in LI-COR eddy covariance systems.

Metek MultiPath Cage

Data and power cables

Part Numbers: 7900-482-x

The data/power cable is available in three lengths. The USB-to-RS-232/RS-485 cable is used to connect the anemometer to a computer.

Table 1‑9. Metek Cage power and data cables that are compatible with the SmartFlux 2 and 3 Systems.
Cable Type Length Part Number
Data and Power 5 m 7900-482-5
Data and Power 25 m 7900-482-25
Data and Power 50 m 7900-482-50
USB to RS-232/RS-485 1.8 m 392-16348

Mounting kit

Part Number: 7900-346

Mount the Metek Cage anemometer with one 1" × 1" crossover fitting (7900-346).

Cross-over fitting
Figure 1‑5. A simple 1" × 1" crossover fitting can mount the Metek Cage to the LI-COR tripod crossarm.

RM Young 81000x

Data and power cables

Part Number: 7900-472-x

The data/power cable is available in three lengths. The USB-to-RS-232/RS-485 cable is used to connect the anemometer to a computer.

Table 1‑10. RM Young 81000 series power and data cables that are compatible with the SmartFlux 2 and 3 Systems.
Cable Type Length Part Number
Data and Power 5 m 7900-472-5
Data and Power 25 m 7900-472-25
Data and Power 50 m 7900-472-50
USB to RS-232/RS-485 1.8 m 392-16348

Mounting kit

Part Number: 7900-332

Mount the RM Young 81000, 81000V, 81000RE, or 81000VRE sonic anemometer with the RM Young mounting kit (7900-332).

Table 1‑11. The RM Young mounting kit and components.
Description Quantity Part Number
Crossover Fitting (1" × 1") 1 7900-346
45 cm Riser Bar (1" IPS) 1 9879-095
Cross-over fitting45 cm riser bar
Figure 1‑6. A crossover fitting and 45 cm riser bar are can mount the 81000 series anemometers to the cross arm.