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

Home

An overview of configurations

Configuring the LI-8250 Multiplexer block

Configuring the Sampling Sequence block

SDI-12 console

Files

Diagnostics

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

A

Soil gas flux measurement theory

Accounting for an altered diffusion gradient

Measurement length

The measurement cycle

Terminology

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