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Portable Photosynthesis System
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LI-6800

Portable Photosynthesis System

The LI-6800 is the premier solution for measuring photosynthetic gas exchange and chlorophyll a fluorescence. Highly extendable and stable, it empowers researchers to test hypotheses with unmatched confidence.

🔬 Scientist-Friendly

Focus on data collection with intuitive utilities and research-centric design.

⚙️ Experiment-Ready

Support for custom gas mixtures, auxiliary sensors, and extensive programming.

🌲 Field-Optimized

Built for the field with ergonomic grips, carrying harnesses, and versatile mounting options.

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Benefits

LI-6800 Core Features

Precision Control & Analytical Excellence

⚖️ Stable Measurements

  • High-Precision IRGAs: Stable NDIR analyzers for trust from the 1st to 1000th measurement.
  • Patented Flow Splitting: Differential system with small volume for fast response.
  • Open-Path Design: IRGAs open to sample chamber for tight coupling.

💨 CO₂ Control

  • Extended Range: 0 to 3,100 μmol mol⁻¹ CO₂.
  • Portable Source: Uses 8g cylinders (8 hrs control) or tank gases.
  • Responsive: Enables the Dynamic Assimilation™ Technique.

💧 H₂O Control

  • Chemical-Free: Humidification via Nafion™ tubes (just add water).
  • Condensation Protection: Automatic alerts and setpoint overrides.
  • Fast Adjustment: Quickly reaches setpoints for humidity.

🌡️ Temperature Control

  • Heat Exchanger: Control up to ±10 °C from ambient.
  • Precise Leaf Temp: Accurate measurement at the contact point.
  • Versatile: Supports setpoints, ramps, or energy balance.

☀️ Light Control

  • Uniformity: Within ±10% over 90% of leaf area.
  • Integrated Sensors: External LI-190R logs ambient light; in-chamber sensor ensures setpoints.
  • Smart Sources: Auto-accounts for transparent film losses.

🌀 Optimum Flow

  • Durable Pump: Variable speeds (1 to 2.5 L/min).
  • Leak Detection: Real-time measurements accounted for in equations.
  • Precision Monitoring: Tracks primary, sample, and reference flow.

🔬 6800-01A Fluorometer Chamber

Combined gas exchange and fluorescence over the same 2 cm² or 6 cm² area. Features PAM technology for simultaneous insights into energy production and consumption.

Key Specs: Rectangular & Multiphase flashes, high-speed induction kinetics, and aquatic sample compatibility.

[ Image Placeholder: Fluorescence Plot ]

Peak Outputs: 475nm (Blue), 625nm (Red), 735nm (Far-red)

A = μ(c₁ – c₂) / S

Steady-State Assimilation Equation

Specifications

Specifications

LI-6800 Technical Specifications

Complete Performance & Engineering Data

🔍 CO₂ Gas Analyzer

Type: Absolute Non-Dispersive Infrared (NDIR)
Range: 0 – 3100 μmol mol⁻¹
Precision: ≤0.1 μmol mol⁻¹ (RMS 4-sec avg)
Accuracy: Within 1% (>200 μmol), ±2 μmol (<200 μmol)

💧 H₂O Gas Analyzer

Type: Absolute Non-Dispersive Infrared (NDIR)
Range: 0 – 75 mmol mol⁻¹
Precision: ≤0.01 mmol mol⁻¹ (RMS 4-sec avg)
Accuracy: Within 1.5% (>5 mmol), ±0.08 mmol (<5 mmol)

🌡️ Temperature Control

Control Range: Leaf Temp: ±10 °C from ambient
Operating: 0 – 50 °C
Leaf Sensor: Type E fine-wire thermocouple
Accuracy: ±0.15 °C (Exhaust); <±0.5 °C (Leaf)

🌀 Air Flow & Pressure

Bulk Flow: 680 – 1700 μmol s⁻¹ at SATP*
Chamber Flow: 0 – 1400 μmol s⁻¹ at SATP
Console Pressure: 50 – 110 kPa (±0.4 kPa accuracy)
Chamber Pressure: Range: -2 – 2 kPa (Resolution <1 Pa)

💻 Console & Hardware

Processor: Arm® Cortex® A9 Quad Core (1 GHz)
Memory: 2 GB RAM; 8 GB Flash
Display: 10.2″ Sunlight-readable TFT LCD
Power: 12–18 VDC or 24 VDC
Console Weight: 6.1 kg (Console); 2.15 kg (Head)

☀️ Light Measurement

Chamber PAR: 0 – 3000 μmol m⁻² s⁻¹
External Sensor: LI-190R Silicon Photodiode
Accuracy: ±5% (Traceable to NIST)

🔬 Multiphase Flash™ Fluorometer

Measuring Peak: 625 nm (Red)
Actinic Blue: 475 nm (Peak)
Actinic Red: 625 nm (Peak)
Saturation Light: 0 – 16,000 μmol m⁻² s⁻¹
Modulation: 1 Hz – 250 kHz (Selectable)
Leaf Area: 6 cm² or 2 cm² round apertures

📦 Accessory & Specialized Chambers

Aquatic Chamber: 15 mL recommended volume; 316 Stainless/Float Glass construction.
Large Light Source: >2500 μmol m⁻² s⁻¹; RGBW Output (4000 K White).
Soil CO₂ Flux: 4244.1 cm³ Volume; 317.8 cm² Area.
Insect Respiration: 49.9 cm³ Volume; Weight: 0.07 kg.
Bryophyte/Small Plant: 193.2 cm³ Internal volume; 7 cm diameter.
Large Leaf/Needle: 36 cm² Max area; compatible with conifer sprig blocks.

*SATP defined as Standard Ambient Temperature (25 °C) and Pressure (100 kPa). Specifications subject to change without notice. All measurements traceable to NIST.

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