Specifications
The following list of specifications1 describes the performance characteristics of the LI-6800 and its accessories.
CO2 gas analyzer
Type: Absolute non-dispersive infrared gas analyzer
Measurement range: 0 – 3100 μmol mol-1
Precision (signal noise) at 400 μmol mol-1
RMS with 4-second signal averaging: ≤ 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) at 10 mmol mol-1
RMS with 4-second signal averaging: ≤ 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 °C – 60 °C
Temperature control range
Leaf temperature: ±10 °C from ambient with 3 cm × 3 cm chamber
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
Air flow rates
Bulk flow rate range: 680 – 1700 μmol s-1 at SATP1
Leaf chamber flow rate range: 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 – 0.1 kPa (dependent on flow rate through the chamber)
Communication
RJ-45 Ethernet; IP/TCP for networks and computers: 1
Head connections: 2
Accessory connections: 2
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)
Sources:
8 gram CO2 cartridge
External tank with optional adapter kit
CO2 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: Sorbead® Orange CHAMELEON® silica gel beads
Light measurement
Chamber and light source PAR sensors:
Detector: Gallium arsenide
Sensitivity range: 0 – 3000 μmol m-2 s-1
Resolution: < 1 μmol mol-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: Arm® Cortex®2 A9 Quad Core running at 1 GHz.
Memory: 2 GB RAM; 8 GB Flash memory
Display: Sunlight-readable TFT LCD with capacitive touch screen
Resolution: 1024 × 600 pixels
Dimensions: 26 cm diagonally
Size: 18.5 cm × 27.5 cm × 21 cm; (D × W × H)
Weight: 6.1 kg
Power requirements: 12 to 18 VDC or 24 VDC
Head
Size with 3×3 cm chamber: 37 cm × 11.5 cm × 21.6 cm (L × W × H)
Weight: 2.15 kg without chamber
Display resolution: 128 × 128 pixels
Display dimensions: 3.15 cm diagonally
Sensor head inputs:
Leaf temperature thermocouple: 2
LI-190R light sensor: 1
Sensor head light source connections: 1
Leaf Chambers, Light Sources, and Accessories
The following components may be ordered separately or as a package with the LI-6800.
Fluorometer chamber
Modulated light: Software controlled, selectable frequencies of 1 Hz – 250 kHz
Measuring light peak wavelength: 625 nm
Blue actinic peak wavelength: 475 nm
Red actinic and saturating flash peak wavelength: 625 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
Dimensions: 16.6 cm × 11.5 cm × 13.6 cm (L × W × H)
Weight: 0.86 kg
Small leaf chamber (3 × 3 cm)
Aperture areas: 9 cm2 (3 cm × 3 cm), 6 cm2 (2 cm × 3 cm), 3 cm2 (1 cm × 3 cm)
Size: 15.4 cm × 11.5 cm × 5.9 cm (L × W × H)
Weight: 0.3 kg
Large leaf and needle chamber (6 × 6 cm)
Maximum leaf area: 36 cm2
External dimensions: 11.5 cm wide (spring to spring) × 16.8 cm long (front of chamber to back of chamber link) × 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
Chamber Volume: 420.8 cm3 (internal)
Maximum planar leaf area: 36 cm2
Internal chamber height: 6.7 cm
External dimensions: 11.5 cm wide (spring to spring) × 16.8 cm long (front of chamber to back of chamber link) × 7.2 cm tall (bottom to top of chamber)
Small plant chamber
Chamber volume: 193.2 cm3 (internal)
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
Bryophyte chamber
Chamber volume: 193.2 cm3 (internal)
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
Insect respiration chamber
Chamber volume: 49.9 cm3 (not including tubing)
Exterior dimensions: 11.25 cm length; 3 cm diameter
Interior dimensions: 10.1 cm length; 2.5 cm diameter
Weight: 0.07 kg
Small light source (3 × 3 cm)
The small light source is compatible with the small leaf chamber.
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 at 2000 µmol m‑2 s‑1: < 5 W
Operating temperature range: 0 – 50 °C
Size: 6.6 cm × 5.9 cm × 5.8 cm (L × W × H)
Weight: 0.21 kg
Large light source (6 × 6 cm)
The large light source is compatible with the large leaf chamber, small plant chamber, sprig adapter kit, and the bryophyte chamber.
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 cm × 11 cm × 13 cm (L × W × H)
Weight: 0.54 kg
Aquatic chamber
Sample volume: >0 to 20 mL; 15 mL recommended
Wetted materials: 316 stainless, float glass, Viton, PTFE, silicone, acetal
Operating temperature range: Non-freezing to 50 °C with no solar load
Sample temperature control: User supplied water bath
Storage temperature range: -20 to 60 °C with clean and dry chamber
Sample salinity range: 0 to 35 ‰
pH probe port
pH probe opening 12 mm diameter O-ring sealed port
Compatible probe type: Passive glass-electrode based pH probe
BNC Connector: Nominal -59mV/pH slope, integrated amplifier with user-settable calibration
Septum port
Material: Silicone-PTFE
Size: 3/8" diameter
Soil chamber
System
Chamber volume: 4244 cm3
IRGA volume: 57 cm3
Soil area: 317.8 cm2
Air temperature thermistor:
Operating range: -20 to 45 °C
Accuracy: ±0.5 °C over 0 °C to 70 °C
Soil Collars
Inside diameter: 20.1 cm ±0.03 cm
Outside diameter: ~21.3 cm
Height: 11.43 cm
