LI-8250 Multiplexer Soil Gas Flux System

Where Precise Gas Analysis Meets Patented Chamber Technology

As the access point of communication, the LI-8250 lets you control, monitor, and review measurements from each chamber. When connected with a LI-COR gas analyzer, see live flux calculations and diagnostics at your site. Connect with a third-party analyzer to provide time-synchronization for post-processing of fluxes of other gases.

The LI-8250 includes an embedded Wi-Fi server. This server allows you to connect to the Multiplexer using any Wi-Fi enabled device via browser. Add a cellular modem to receive daily summary files and remotely monitor your system—visit the site only as necessary.

+ How is the LI-8250 Multiplexer different from the LI-8150 Multiplexer?

How is the LI-8250 Multiplexer different from the LI-8150 Multiplexer?

	LI-8250 Multiplexer	LI-8150 Multiplexer
Rugged and fieldable
Third-party analyzer integration
Custom chamber integration
SDI-12 compatible long-term chambers
Built-in Wi-Fi connectivity*
Real-time flux processing^†
No separate analyzer control unit required

* Wi-Fi connectivity limited in some countries
† When connected to a LI-COR gas analyzer

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Preliminary Specifications

General

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 extension tube.
- Maximum diameter of measurement circle: 30.0 m with one extension tube on each chamber.
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

Communication

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

Power Requirements: 10 to 30 VDC (120 VAC and 240 VAC with optional power supply). The LI-8250 powers the LI-870 when connected. Other analyzers are powered separately. See Table 1 for total system power requirements.

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
8200-104 (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

Specifications subject to change without notice.