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Specifications

photo of LI-6800 Portable Photosynthesis System

Distinguishing Specifications

For brevity, here are some specifications that distinguish the LI-6800.

CO2 Analyzers

  • CO2 analyzer precision: Within 0.1 µmol mol-1 RMS with 4-second averaging at 400 µmol mol-1

H2O Analyzers

  • H2O analyzer precision: Within 0.01 mmol mol-1 RMS with 4-second averaging at 10 mmol mol-1

System

  • Bulk flow rate range: 680 – 1700 µmol s-1 at SATP1
  • Light source uniformity: <±10% variation over 90% of aperture
  • Chamber temperature control range: 10 °C above or below ambient

Distinguishing Fluorometer Specifications

  • Modulation frequency: 1 Hz – 250 kHz
  • Measuring light peak wavelength: 625 nm
  • Red actinic and saturating flash peak wavelength: 625 nm
  • Blue actinic peak wavelength: 475 nm
  • Far-red peak wavelength: 735 nm
  • Actinic light output
    • 0 – 3000 µmol m-2 s-1 total at 25 °C
    • 0 – 1000 µmol m-2 s-1 blue at 25 °C
    • 0 – 2000 µmol m-2 s-1 red at 25 °C
  • Saturation light: 0 – 16,000 µmol m-2 s-1 at 25 °C
  • Far-red light: 0 – 20 µmol m-2 s-1 at 25 °C

Full Specifications

CO2 Gas Analyzer

  • Type: Absolute non-dispersive infrared gas analyzer
  • Measurement Range: 0 – 3100 µmol mol-1
  • Precision (signal noise) RMS 4-second signal averaging at 400 µmol mol-1: ≤0.1 µmol mol-1
  • Accuracy: Within 1% of reading at 200 µmol mol-1 or above, ±2 µmol mol-1 at <200 µmol mol-1
  • Orientation Sensitivity: ≤±1 µmol mol-1 variation at 400 µmol mol-1 from any orientation

H2O Gas Analyzer

  • Type: Absolute non-dispersive infrared gas analyzer
  • Measurement Range: 0 – 75 mmol mol-1
  • Precision (signal noise) RMS 4-second signal averaging at 10 mmol mol-1: ≤0.01 mmol mol-1
  • Accuracy: Within 1.5% of reading at >5 mmol mol-1; ±0.08 mmol mol-1 at < 5 mmol mol-1

Temperatures

  • Operating temperature range: 0 – 50 °C
  • Storage temperature range: -20 – 60 °C
  • Temperature control range
    • Leaf temperature: ±10 °C from ambient
    • Setpoint resolution: 0.1 °C
  • Chamber exhaust air temperature and temperature control block
    • Type: Thermistor
    • Range: -10 – 60 °C
    • Accuracy: ±0.15 °C
  • Leaf temperature sensor
    • Type: Type E fine-wire thermocouple
    • Sensitivity range: -10 – 60 °C
    • Accuracy: <±0.5 °C total; ±0.2 °C cold junction reference; ±0.3 °C thermocouple when within ±10 °C of cold junction temperature

Communication

  • RJ-45 Ethernet; IP/TCP for networks and computers: 1
  • Head connections: 2
  • Accessory connections: 2

Air Flow Rates

  • Bulk flow rate: 680 – 1700 µmol s-1 at SATP1
  • Leaf chamber flow rate: 0 – 1400 µmol s-1 at SATP

Pressure

Console pressure sensor
  • Operating Range: 50 – 110 kPa
  • Accuracy: ±0.4 kPa
  • Resolution: 1.5 Pa typical
  • Signal noise: ≤0.004 kPa peak-to-peak with 4-second signal averaging
Chamber pressure sensor
  • Range: -2 – 2 kPa
  • Resolution: <1 Pa typical
  • Signal noise: 1 Pa peak-to-peak with 4-second signal averaging
  • Setpoint resolution: 1.0 Pa
  • Control Range: 0 – 200 Pa (dependent on flow rate through the chamber)

Batteries

  • Weight: 0.435 kg
  • Capacity: 6800 mAh
  • Type: Lithium Ion
  • Storage: -20 – 60 °C; ≤80% RH

CO2 Control

  • CO2 control range: 0 – >2000 µmol mol-1 (with pump set to low; dependent on bulk flow rate)
  • CO2 cartridge type: 8 gram
  • Cartridge lifetime: >8 hours after puncture (dependent on setpoint)
  • CO2 Scrubber: Soda lime

H2O Control

  • H2O control range: 0 – 90% RH (noncondensing)
  • Humidifier substrate: Pall Stuttgarter Masse ceramic substrate (Pall Corporation)
  • Desiccant: Silica Gel (BASF Sorbead® Orange CHAMELEON®)

Light Measurement

  • Chamber and light source PAR sensors:
    • Sensitivity range: 0 – 3000 µmol m-2 s-1
    • Resolution: <1 µmol m-2 s-1
    • Calibration accuracy: ±5% of reading; Traceable to the U.S. National Institute of Technology (NIST)
  • External LI-190R PAR Sensor:
    • Detector: Silicon photodiode
    • Sensitivity: 5 – 10 µA per 1000 µmol s-1 m-2
    • Calibration accuracy: ±5% of reading; Traceable to NIST

Console

  • Processor: 800 MHz ARM® Cortex™ A8
  • Memory: 512 MB RAM; 8 GB Flash memory
  • Display: Sunlight-readable TFT LCD with capacitive touch screen
    • Resolution: 1024 x 600 pixels
    • Dimensions: 26 cm diagonally
  • Size: 18.5 x 27.5 x 21 cm; (D x W x H)
  • Weight: 6.1 kg
  • Power requirements: 12 – 18 VDC or 24 VDC

Head

  • Size with 3x3 cm Clear Leaf Chamber: 37 x 11.5 x 21.6 cm (L x W x H)
  • Weight: 2.15 kg without chamber
  • Display resolution: 128 x 128 pixels
  • Display dimensions: 3.15 cm corner-to-corner
  • Head inputs
    • Leaf temperature thermocouple: 2
    • LI-190R light sensor: 1
  • Head light source connections: 1

Clear-top Chamber

  • Maximum leaf area: 9 cm2
  • Size: 15.4 x 11.5 x 5.9 cm (L x W x H)
  • Weight: 0.3 kg

Small Light Source

  • Total output range: 0 – >2000 µmol m-2 s-1 at 25 °C
  • Blue output range: 0 – >400 µmol m-2 s-1 at 25 °C
  • Red output range: 0 – >1600 µmol m-2 s-1 at 25 °C
  • Red peak wavelength: 660 nm
  • Blue peak wavelength: 453 nm
  • Uniformity:
    • ±10% over 90% of the aperture with white top gasket, typically
    • ±10% over 77% of the aperture with black gasket, typically
  • Power consumption: 2000 µmol m-2 s-1 <5 watts
  • Operating temperature range: 0 – 50 °C
  • Size: 6.6 x 5.9 x 5.8 cm (L x W x H)
  • Weight: 0.21 kg

Large Light Source

  • Total output range: 0 - >2500 µmol m-2 s-1 at 25 °C
  • Blue output range: >2000 µmol m-2 s-1 at 25 °C
  • Green output range: >1000 µmol m-2 s-1 at 25 °C
  • Red output range: >2400 µmol m-2 s-1 at 25 °C
  • White output range: >1500 µmol m-2 s-1 at 25 °C
  • Blue peak wavelength: 453 nm
  • Green peak wavelength: 523 nm
  • Red peak wavelength: 660 nm
  • White color temperature: 4000 K
  • Uniformity: ±10% over 90% of the aperture
  • Power consumption: 15 W at 2000 µmol m-2 s-1 equal parts red, green, blue, and white
  • Operating temperature range: 0 – 50 °C
  • Operating relative humidity range: 0 – 85%
  • Size: 11.7 × 11 × 13 cm (L × W × H)
  • Weight: 0.54 kg

Small Plant Chamber

  • Chamber volume: 193.2 cm3 (internal volume)
  • Internal dimensions: 7 cm diameter; 4.46 cm deep
  • External dimensions: 8.4 cm wide (chamber block) × 12.7 cm long (chamber manifold interface to tip of chamber) × 6.47 cm (bottom of chamber manifold to top of chamber)
  • Weight: 0.60 kg

Custom Chamber Adapter

  • Chamber volume: 34.2 cm3 (internal volume)
  • External Dimensions: 1.25 × 7.67 × 5.85 cm (L × W × H)

Insect Respiration Chamber

  • Chamber volume: 49.9 cm3 (not including tubing)
  • Exterior dimensions: 11.25 cm length; 3 cm diameter
  • Weight: 0.07 kg

Multiphase Flash Fluorometer

  • Modulated light: Software controlled and software selectable frequencies of 1 Hz – 250 kHz
  • Measuring light peak wavelength: 625 nm
  • Red actinic and saturating flash peak wavelength: 625 nm
  • Blue actinic peak wavelength: 475 nm
  • Far-red peak wavelength: 735 nm
  • Actinic light output
    • 0 – 3000 µmol m-2 s-1 total at 25 °C
    • 0 – 1000 µmol m-2 s-1 blue at 25 °C
    • 0 – 2000 µmol m-2 s-1 red at 25 °C
  • Saturation light: Software controlled intensity; 0 – 16,000 µmol m-2 s-1 at 25 °C
  • Far-red light: Software controlled intensity; 0 – 20 µmol m-2 s-1 at 25 °C
  • Fluorescence signal temperature dependence: -0.25% per °C
  • Uniformity: <±10% over 92% of the aperture with white top gasket
    • <±10% over 90% of the aperture with black top gasket
  • Power consumption:
    • <18 W at 25 °C with 3000 µmol m-2 s-1 actinic light
    • <60 W at 25 °C with 16,000 µmol m-2 s-1 saturating flash
  • Leaf area: 6 cm2 or 2 cm2; Round apertures
  • Size: 16.6 x 11.5 x 13.6 cm (L x W x H)
  • Weight: 0.86 kg

Large Leaf and Needle Chamber

  • Maximum leaf area: 36 cm2
  • External dimensions: 11.5 cm wide (spring to spring) x 16.8 cm long (front of chamber to back of chamber link) x 5.9 cm tall (bottom of chamber manifold to top of chamber)
  • Weight: 0.35 kg

Large Leaf and Needle Chamber with Conifer Sprig Blocks

  • Maximum planar leaf area: 36 cm2
  • Internal Chamber Height: 6.7 cm
  • External dimensions: 11.5 cm wide (spring to spring) x 16.8 cm long (front of chamber to back of chamber link) x 7.2 cm tall (bottom to top of chamber)
  • Volume: 25.68 in3 or 420.8 cm3

Bryophyte Chamber

  • Chamber volume: 193.2 cm3 (internal volume)
  • Internal dimensions: 7 cm diameter; 4.45 cm deep
  • External dimensions: 8.4 cm wide (chamber block) × 12.7 cm long (chamber manifold interface to tip of chamber) × 6.47 cm (bottom of chamber manifold to top of chamber)
  • Weight: 0.60 kg

Soil CO2 Flux Chamber

  • Chamber volume: 4244.1 cm3
  • IRGA volume: 57 cm3
  • Soil area: 317.8 cm2 (49.3 in2)
  • Air Temperature Thermistor:
    • Operating Range: -20 to 45 °C
    • Accuracy: ±0.5 °C over 0 °C to 70 °C
  • Weight: 4.06 kg
  1. SATP is defined as Standard Ambient Temperature (25 °C) and Pressure (100 kPa).

Specifications subject to change without notice