LI-8100A Automated Soil CO2 Flux System

The LI-8100A has been discontinued. Check out our newest solutions for survey and long-term soil gas flux research.

LI-8100A Analyzer Control Unit

A portable, automated system for simple and reliable survey and long-term measurements over a study site. The LI-8100A Analyzer Control Unit contains an infrared gas analyzer and a connection panel to interface with the 8100-103 Survey Chamber, the 8100-104 and 8100-104C Long-Term Chambers, additional gas analyzers, and the LI-8150 Multiplexer.

LI-8100a

General

  • Power Requirements: 14.5 VDC to 28 VDC; 3 A @ 12 V (36 W) maximum during warm-up; 1 A @ 12 V (12 W) average
  • Operating Temperature Range: -20 °C to 45 °C
  • Relative Humidity Range: 0% to 95% RH, Non-Condensing
  • Weatherproof Rating: Tested to IEC IP55 standard
  • Dimensions: 29 cm L × 38.1 cm W × 16.5 cm H (11.4” × 15” × 6.5”)
  • Weight: 5.3 kg (11.8 lbs) without battery; 6.7 kg (14.8 lbs) with battery
  • Battery Weight: 1.4 kg (3.0 lbs)
  • Memory: 18 MB flash memory for data collection (32 MB total)
  • Compact Flash Card: Type I industrial grade, 1 GB with adapter sleeve included, will accept Type II with appropriate adapter sleeve
  • Wireless PC Card: Fixed wireless networking Type II PC Card. Cisco Systems Aironet® 350 Series 11 Mbps DSSS for Wi-Fi (802.11b) networking
  • RS-232 Maximum Output Rate: 1 Hz
  • RS-232 Baud Rate: 57,600 bps
  • Hand-held Device Requirements:
    • Apple devices: Compatible with iOS versions 4 to 14.8. Not compatible with iOS versions newer than 14.8.
    • Android devices: Compatible with devices with ARMv7 CPU architecture. Not compatible with CPU architectures common to newer devices.
  • Pressure Sensor Range: 15 kPa to 115 kPa
  • Pressure Sensor Accuracy: 1.5% over 0 °C to 85 °C
  • Maximum Gas Flow Rate: ~2.0 lpm

Infrared Gas Analyzer

  • Measurement Principle: Non-Dispersive Infrared
  • Traceability: Traceable to WMO standards for CO2. NIST traceable LI-610 Portable Dew Point Generator for H2O

CO2

  • Measurement Range: 0 ppm to 20,000 ppm
  • Accuracy: 1.5% of reading
  • Drift at 0 ppm: <0.15 ppm/°C
  • Span Drift1: <0.03%/°C
  • Total Drift at 370 ppm: <0.4 ppm/°C
  • RMS Noise at 370 ppm with 1 sec signal averaging: <1 ppm
  • Sensitivity to water vapor: <0.1 ppm CO2/mmol/mol H2O

H2O

  • Measurement Range: 0-60 mmol/mol
  • Accuracy: 1.5% of reading
  • Calibration Drift
    • Drift at 0 mmol mol-1: <0.005 mmol/mol-1/°C
    • Span Drift1 at 10 mmol mol-1: <0.006 mmol/mol-1/°C
    • Total Drift at 10 mmol mol-1 <0.016 mmol/mol-1/°C
  • RMS Noise at 10 mmol/mol with 1 sec signal averaging: <0.01 mmol/mol
  • Sensitivity to CO2: <0.0001 mmol/mol H2O/ppm CO2

Specifications subject to change without notice.

LI-8150 Multiplexer

Measure gas exchange from multiple long-term chambers to determine spatial and temporal flux rates. Capable of running autonomously for months, the LI-8100A and LI-8150 system collects a continuous dataset in configurations up to 16 chambers.

Integrate additional gas analyzers, such as the LI-7810 CH4/CO2/H2O Trace Gas Analyzer, or third-party gas analyzers to measure fluxes of methane, isotopologues, and other gases.

LI-8150

General

  • Dimensions: 40.6 cm L × 57.2 cm W × 21.1 cm H
  • Weatherproof Rating: Tested to IEC IP55 standard
  • Weight:
    • 8 ports: 9.4 kg
    • 16 ports: 11.2 kg
  • Operating Range:
    • Temperature: –20 to 45 °C
    • Humidity: 0 to 95% RH, non-condensing
  • Maximum Spread: 30.0 m
  • Flow Rate to Chambers: ~3.0 lpm (non-adjustable)
  • Flow Rate Between LI-8100A and LI-8150: ~2.0 lpm
  • Power Requirements: 410.5 VDC to 14.5 VDC (120 VAC and 240 VAC with optional power supply)
  • Soil Temperature Thermistor (optional): ±1.0 °C from –20 to 50 °C

AC to DC Power Supply (8150-770)

  • Dimensions: 18.1 cm D × 28 cm L × 10.2 cm H
  • Weight: 3.1 kg
  • Weatherproof Rating: Tested to IEC IP55 standard
  • Operating Temperature Range: –20 to 50 °C
  • Power Requirements: 115 to 120 VAC or 230 to 240 VAC, 50/60 Hz, 230 W. Input voltage range is switch-settable.
  • Output Voltage: 12 VDC

Table 1. Total system power requirements.

LI-8100 + LI 8150 + n Chambers Sampling: No Chamber Movement Sampling: Two chambers moving at once Warm-up: Up to four chambers move at once
n Chambers Amps @ 12.5 VDC Watts Amps @ 12.5 VDC Watts Amps @ 12.5 VDC* Watts
1 1.0 12.5 3.0 37.5 3.0 37.5
2 2.0 25.0 3.8 47.5 3.8 47.5
4 2.1 26.3 3.8 47.5 4.8 60
8 2.1 26.3 3.8 47.5 4.8 60
16 2.3 28.8 3.8 47.5 4.8 60

* Power requirements of the LI-8100/8150 System at minimum operating temperature.

Specifications subject to change without notice.

Soil Gas Flux Chambers

8100-104 Opaque Long-Term Chamber

Designed for use with the LI-8100A for single, long-term measurements, or with the LI-8150 Multiplexer. A motorized chamber allows for automated measurements in the field over long periods of time with minimal disturbance to the soil surface inside the collar.

8100-104 Opaque Long-Term Chamber

General

  • Dimensions: 48.3 cm L × 38.1 cm W × 33.0 cm H
  • Weight: 5.9 kg
  • Chamber Volume: 4076.1 cm3
  • Soil Area Exposed: 317.8 cm2
  • Weatherproof Rating: Tested to IEC IP55 standard
  • Air Temperature Thermistor:
    • Operating Range: –20 to 45 °C
    • Accuracy: ±0.5 °C over 0 to 70 °C
  • Cable Length: 15 m

Specifications subject to change without notice.

8100-104C Clear Long-Term Chamber

The clear chamber is designed for long-term net carbon exchange measurements. It features a durable, clear chamber top so that plants are exposed to sunlight during measurements.

8100-104C Clear Long-Term Chamber

General

  • Dimensions: 48.3 cm L × 38.1 cm W × 33.0 cm H
  • Weight: 5.9 kg
  • Chamber Volume:
    • Serial numbers 2024 and below: 4076.1 cm3
    • Serial numbers 2025 and above: 3876.1 cm3
  • Soil Area Exposed: 317.8 cm2
  • Weatherproof Rating: Tested to IEC IP55 standard
  • Air Temperature Thermistor:
    • Operating Range: –20 to 45 °C
    • Accuracy: ±0.5 °C over 0 to 70 °C
  • Cable Length: 15 m

Specifications subject to change without notice.

8100-102 Survey Chamber (10 cm)

A 10 cm survey chamber that provides measurements over a small surface area and is designed for use with the LI-8100A Analyzer Control Unit.

8100-102 Survey Chamber

General

  • System Volume: 854.2 cm3
  • Soil Area: 83.7 cm2 (13 inches2)
  • Baseplate Dimensions: 15.2 cm L × 15.2 cm W × 25.4 cm H (6" × 6 " × 10")
  • Air Temperature Thermistor:
    • Operating Range: -20 to 45 °C
    • Accuracy: ± 0.5 °C over 0 °C to 70 °C
  • Cable Length: 1.01 m (40”)
  • Weight: 1.6 kg (3.5 lbs)

Specifications subject to change without notice.

Application Accessories

CO2 Mapping Kit (8100-405)

Designed for use with the LI-8100A Analyzer Control Unit for mapping ground level CO2 concentrations, or for use with survey systems. Includes GPS receiver, cable assembly, mounting bracket, quick connect fitting, and Bev-A-Line® tubing.

8 Port Flask Sampling Kit (8150-670-8)

Includes all hardware needed to connect up to 8 flasks to the 8-port LI-8150 Multiplexer.

16 Port Flask Sampling Kit (8150-670-16)

Includes all hardware needed to connect up to 16 flasks to the 16-port LI-8150 Multiplexer.

Trace Gas Sampling Kit (8100-664)

Used to collect samples from the same air stream used to measure CO2 flux for further trace gas analysis.

Profiling Kit (8150-662)

For atmospheric profiling studies using the LI-8150 Multiplexer and LI-8100A Analyzer Control Unit. Includes hardware for four ports; 8150-250 Bev-A-Line® tubing sold separately.

Soil Temperature Thermistor (8100-203)

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