LI-6800 Portable Photosynthesis System

Brand: LI-COR
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Brand: LI-COR

Product Code: LI6800

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Specifications: (see all)

Measured / controlled parameters

Photosynthesis rate (A), transpiration (E), internal CO₂ concentration (Ci), stomatal conductance (gsw), chlorophyll a fluorescence (F₀, Fm, Fv/Fm, Yield), leaf and air temperature, relative humidity, light intensity (PAR), air pressure.

Measurement / analysis range

CO₂: 0–3100 µmol mol⁻¹; H₂O: 0–75 mmol mol⁻¹; PAR (chamber): up to 3000 µmol m⁻² s⁻¹; saturation fluorescence up to 16,000 µmol m⁻² s⁻¹.

Measurement accuracy / precision

CO₂: precision ≤ 0.1 µmol mol⁻¹ RMS at 400 µmol mol⁻¹ (4-second averaging).

Analysis method / operating principle

Open gas‐exchange system: comparison of reference and sample airstreams; simultaneous measurement of gas exchange and fluorescence (when fluorometer enabled) on same leaf area.

Analysis / measurement time

Measurements occur in real‐time; logging intervals from seconds.

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The LI-6800 Portable Photosynthesis System from LI-COR Biosciences (USA) is the benchmark instrument for simultaneous measurement of leaf gas exchange (CO₂ and H₂O) and chlorophyll fluorescence on the same sample area. Combining precision, stability, and intuitive operation, it is a universal tool for both fundamental and applied studies of photosynthetic performance in plants.

The LI-6800 integrates dual high-stability non-dispersive infrared gas analyzers (NDIR) for synchronous measurement of CO₂ and H₂O fluxes. Equipped with temperature, humidity, pressure, and light sensors, the system ensures reliable operation under any environmental conditions — from controlled laboratory setups to challenging field environments.

Its Leaf Chamber Fluorometer (6800-01A) enables simultaneous detection of photosynthetic rate, transpiration, and chlorophyll fluorescence (parameters F₀, Fm, Fv/Fm, Yield, NPQ, etc.). The instrument features a fully automated microclimate control system, regulating air flow, temperature, humidity, and CO₂ concentration to simulate natural or stress conditions with high reproducibility.

A large anti-glare touchscreen display visualizes real-time A/Ci curves, light-response graphs, and system diagnostics. Built-in USB, Wi-Fi, and Bluetooth interfaces and ample memory enable seamless data storage and transfer without additional hardware. Hot-swappable lithium-ion batteries provide up to 16 hours of autonomous operation, ensuring uninterrupted performance during long field sessions.

The LI-6800 is compatible with LI-COR PC Software Suite, supporting data export in Excel, CSV, and image formats. Its modular design simplifies maintenance and calibration, while the lightweight ergonomic casing enhances portability and durability.

The LI-6800 represents the new standard for advanced measurement of photosynthetic efficiency, CO₂ and H₂O exchange, water-use efficiency, and plant stress physiology. It is widely used in plant physiology, botany, agronomy, ecology, climate research, and plant genetics.

Tags: Soil and plant analysis

Soil and plant analysis

Measured / controlled parameters

Measurement / analysis range

CO₂: 0–3100 µmol mol⁻¹; H₂O: 0–75 mmol mol⁻¹; PAR (chamber): up to 3000 µmol m⁻² s⁻¹; saturation fluorescence up to 16,000 µmol m⁻² s⁻¹.

Measurement accuracy / precision

CO₂: precision ≤ 0.1 µmol mol⁻¹ RMS at 400 µmol mol⁻¹ (4-second averaging).

Analysis method / operating principle

Open gas‐exchange system: comparison of reference and sample airstreams; simultaneous measurement of gas exchange and fluorescence (when fluorometer enabled) on same leaf area.

Analysis / measurement time

Measurements occur in real‐time; logging intervals from seconds.

Sample volume / sample volume range

For leaf chambers: measurement area 2 cm² or 6 cm²; for aquatic samples: working volume up to 20 mL.

Applicable media

Plant leaves (herbaceous, woody, needles), aquatic cultures (algae, macrophytes), soil surfaces — with appropriate chamber.

Sensor / electrode / probe / indicator type

CO₂ and H₂O NDIR analyzers; Type E thermocouple for leaf temperature; PAR photodiode sensor; optional PAM fluorometer with LED sources.

Number of channels / measurement points

Two independent gas analyzers (CO₂ and H₂O); one optical fluorescence channel (if attached); multi‐parameter sensors in leaf chamber.

Temperature compensation

Automatic compensation for leaf, chamber and sensor temperatures; chamber temperature control ±10 °C from ambient (with 3×3 cm chamber).

Number of calibration points / calibration method

Factory two‐point or multi‐point calibration for CO₂/H₂O; built-in automated system tests.

Housing / chamber / tip material

Console – anodized aluminum with carry handle; chamber – stainless steel, glass and PTFE/seals (for aquatic chamber).

Design and features

Modular design (console + chamber); built-in gas analyzers; 5.7″ color touchscreen; ergonomic handle.

Lighting / climate control system

Chamber with actinic LED light source (0–3000 µmol m⁻² s⁻¹), red/blue/far‐red light; control of CO₂, humidity and temperature.

Number of programmable cycles / automatic modes

Supports user scripting (Script Files), auto‐logging, “Dynamic Assimilation™” mode.

Interfaces and outputs

USB, Wi-Fi, Bluetooth, LAN port (depending on configuration); external sensor interface.

Software / PC compatibility

LI-COR PC Software Suite, data export to Excel/CSV, real-time graphs and remote control.

Memory / data storage functions

Internal console memory; files saved in .csv/.txt, built-in viewing and analysis functions.

Operating conditions

Operating temperature: 0 … +50 °C; storage temperature: –20 … +60 °C.

Power supply

Rechargeable lithium-ion batteries; power from 12–18 V DC or 24 V DC.

Battery life

Up to one full day of operation (depends on mode and chamber); battery indicator shows remaining time.

Dimensions

Console: 37 × 11.5 × 21.6 cm (with 3×3 cm chamber); Weight: 2.15 kg without chamber.

Weight

Console weight ~2.15 kg (without chamber) with 3×3 cm chamber configuration.

Scope of supply

LI-6800 console, leaf chamber (e.g., 6800-01A), interchangeable gaskets, battery, charger, software, user manual.

Certificates and compliance with standards

CE, UL/CSA (region dependent); conforms to standards for photosynthesis and gas-exchange research.

Country of origin

USA

Storage conditions

Store in a dry environment at +5 … +40 °C; avoid direct moisture and extreme temperatures.

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