Operating Instructions

Table of Contents

1 Introduction to the LI-8250

What's what

2 Initial setup

Deploying a long-term system

Powering the LI-8250 Multiplexer

Connecting to the LI-8250 Multiplexer

Setting the timezone

Disabling Wi-Fi

Re-enabling Wi-Fi

Configuring a remote server

3 Extension manifolds

Connecting an extension manifold

Determining extension manifold needs

4 Long-term chambers

Installing soil collars

Installing and connecting a long-term chamber

Using sensors

5 Gas analyzers

Connecting an LI-870 CO2/H2O Analyzer

Connecting an LI-78xx Trace Gas Analyzer

Connecting multiple gas analyzers

6 User interface

A tour of the user interface


An overview of configurations

Configuring the LI-8250 Multiplexer block

Configuring the Sampling Sequence block

SDI-12 console



Manual Control

7 Maintenance

Updating the firmware

LI-8250 Multiplexer and 8250-01 Extension Manifold maintenance

Long-term chamber maintenance

Performing the leak tests

8 Troubleshooting

System will not power on or powers on incompletely

Connection and communication problems

LI-COR long-term chamber problems

Data and measurement problems

Support: LI-8250 Multiplexer

A Soil gas flux measurement theory

Accounting for an altered diffusion gradient

Measurement length

The measurement cycle


Deriving the flux equation

Measuring net carbon exchange

B Integrating a custom chamber
C Connecting to non-LI-COR gas analyzers
D Measuring gas fluxes in a flask system
E Connecting to a cellular modem
F Specifications
G Pin assignments

Instruction Manuals

Using the LI-8250 Multiplexer in Soil Gas Exchange Measurements


Instruction manual for the LI-8250 Multiplexer and Long-term Soil Gas Flux System.

Using the LI-870 CO2/H2O Analyzer


Click this link to download the LI-870 instruction manual.

LI-7810 CH4/CO2/H2O Trace Gas Analyzer Instruction Manual


Instruction manual for the LI-7810.

LI-7820 N2O/H2O Trace Gas Analyzer Instruction Manual


Instruction manual for the LI-7820.