Operating Instructions

Table of Contents

1 General information

What’s what

Optional accessories

2 Configuring the LI-7700

Basic setup

Software tour

Operating temperature range

Manual controls

Logging data to a computer

Configuration files

Analog inputs (LI-7700)

3 Field installation

Mounting the LI-7700

Collect data on the gas analyzer position

4 Logging CH4 data in .ghg data files

Configuring the LI-7700 output rate and time setting

Connecting the LI-7700 with the eddy covariance system

Entering LI-7700 information

Selecting variables

Verifying the connection

Turning on data logging

5 Operation with the LI-7550

What's what

Interior label

LI-7550 spare parts kit

Basic setup

Configuring the LI-7550 clock, outputs, and inputs

6 Data files

File header

Diagnostics header

Data header


7 Troubleshooting

Instrument not visible in software when connected using Ethernet

LI-7700 will not power up

Signal strength (RSSI) excessively low

Lower mirror spin motor runs loudly at start-up

Temperature readings are unreasonable

LI-7700 not visible on the network

Pressure measurements noisy

Optics RH warning in the software or diagnostic data

Data loss during night/morning hours

Washer fluid used up too quickly

No methane data stream

Methane density data near zero, negative, or otherwise unbelievable

Instrument does not keep time when disconnected from power supply


Tips for success

8 Maintenance

Changing the internal desiccant bottle

Cleaning the mirrors

Changing the thermocouple

Changing the LI-7550 fuse

Changing the LI-7700 fuse

Updating the software

User calibration: zero and span

Additional details regarding the equations and flux calculations are in the instruction manual.

A The LI-7700 finder application
B Suppliers
C Configuration grammar
D Specifications

Instruction Manuals

LI-7700 Open Path CH4 Analyzer Instruction Manual


Click on this link to download the LI-7700 instruction manual.