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LI-8250 Multiplexer

At the core of a LI-COR long-term soil gas flux system is the LI-8250 Multiplexer. The LI-8250 Multiplexer acts as the single access point for the analyzers and chambers of your soil gas flux research site.

  • SKU : E473-LI-8250
  • Manufacturer: Li-Cor
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At the core of a LI-COR long-term soil gas flux system is the LI-8250 Multiplexer. The LI-8250 Multiplexer acts as the single access point for the analyzers and chambers of your soil gas flux research site.

Research flexibility

Designed for flexibility, the LI-8250 Multiplexer lets you tailor your long-term system to the gas species and analyzer of your choice. LI-COR offers the LI-7810 CH4/CO2/H2Trace Gas Analyzer, the LI-7820 N2O/H2Trace Gas Analyzer, and the LI-870 CO2/H2Analyzer—but third-party analyzers can also be used.

Use any combination of up to 36 opaque, clear, or custom built chambers, and incorporate ancillary data into your fluxes from various sensors.

Convenient control

Embedded software makes the LI-8250 Multiplexer your single access point for your long-term soil gas flux research site. In the field, connect directly to the LI-8250 via the built-in Wi-Fi server and the browser of your mobile device or laptop. Or connect the LI-8250 to an added cellular modem to reach your site remotely and only visit when necessary.

Whether connected directly or remotely, you can view and manage your flux data, diagnostics, system configuration, and distribute daily summary files. If your long-term system is connected to a LI-COR gas analyzer, check the status of your analyzer and view on-site flux data live.

Quality and reliability

The scientific community has entrusted their soil gas flux research to LI-COR products for more than 20 years. The LI-8250 was designed to withstand the rigors of field research with weather, splash, and dust resistant components that allow it to be left in the field for entire seasons. A complete system made up of LI-COR products ensures seamless integration for an ideal soil gas flux research experience.


LI-8250 Specifications
  • Dimensions: 38.5 cm L × 52 cm W × 18.5 cm H
  • Weight: 7.7 kg
  • Weatherproof Rating: Tested to IEC IP55 standard
  • Operating Range:
    • Temperature: –20 to 45 °C
    • Humidity: 0 to 95% RH, non-condensing
  • User Data Storage: 8 GB total non-volatile
  • GPS: Accuracy 2.5 m CEP
  • Coverage Area:
    • Maximum radius from LI-8250 to chambers: 15.0 m with one cable assembly or 30.0 m with an Extension Manifold and two cable assemblies.
    • Maximum diameter of measurement circle: 30.0 m with two cable assemblies or 60.0 m with two Extension Manifolds and four cable assemblies.
  • Plumbing:
    • Flow rate to/from chambers: ~2 to 3 lpm
    • Pump type: Diaphragm (pumps in the analyzers subsample air stream in the LI-8250)
  • Barometric Pressure Sensor:
    • Measurement Range: 20 to 110 kPa
    • Sensor Accuracy: ±0.4 kPa from 50 to 110 kPa
    • Resolution: 0.006 kPa
  • Seven LED Indicators: Power, Ready, Ethernet activity (3), USB activity (2)
  • Connectivity: Three Ethernet Ports, Wi-Fi (not available in some countries)
  • Wi-Fi Compatibility: 2.4 GHz, 802.11 a/b/g/n/ac
  • Connectivity Ports:
    • USB-A: One sealed and strain-relieved for connection to LI-870 CO2/H2O Analyzer
    • USB-A: Two standard, internal for mass storage (file transfer) or a country specific Wi-Fi adapter.
    • RJ-45 Ethernet: Three sealed and strain-relieved for connection to LI-COR Trace Gas Analyzers, site Ethernet network, or cellular modem. Connectors also accept standard, non-sealed RJ-45 Ethernet cables for lab use.
  • Output Port Connector: RS-422 communication plus 24 VDC power, full duplex, 115,200 baud. +24 VDC output power is current limited to ~1.8 A per output port.
  • Power Requirements: 10 to 30 VDC (120 VAC and 240 VAC with optional power supply). The LI-8250 powers the 8200-104/C chambers, the 8250-01 Extension Manifold, and the LI-870 CO2/H2O Analyzer.

Table 1. Total system power requirements.

Typical Power Consumption (W)
Instrument Idle Sampling/ Moving Max/ Warm-up
LI-8250 4.8 15.6 18.2
8250-01 (each) 0.8 9.2 11.0
8200-104/C (each) 0.36 4.8 N/A
LI-870 5.0 5.0 14.0

Note: The max listed for the LI-8250 is a typical maximum, there is no additional warm-up power. Chamber power reaches 4.8 W only when opening or closing, not the entire time of sampling.

AC to DC Power Supply (8250-770)
  • Dimensions: 15 cm L × 12.5 cm W × 8.5 cm H
  • Weight: 1.3 kg
  • Weatherproof Rating: Tested to IEC IP55 standard
  • Environmental Operating Conditions: Tested to IP55 for dust and water ingress
  • Operating Temperature Range: –20 to 50 °C
  • Power Requirements: 100 to 240 VAC, 50/60 Hz, 120 VA
  • Output Voltage: 12 VDC, 6.67 A
  • Alternate Power Input: 21.9 to 26.5 VDC 80 W