LI-820/LI-840 Gas Analyzers
LI-820/LI-840 Gas Analyzers
Installation Instructions for Embedded Software
To update the embedded software in either the LI-820 CO
2
Analyzer, or LI-840 CO
2
/H
2
O Analyzer, you must open the instrument
case and install a programming jumper on the circuit board, and then run a software update utility to re-program the instrument’s
flash memory. Follow these steps to update the software:
1.
Disconnect the power supply from the analyzer. Remove the top cover by unscrewing the 6 spring-loaded screws with a
Philips head screwdriver.
2.
Locate the pin
s
and jumper
labeled
LK3
on the circuit board; it is located near the optical bench, just above the LI-COR logo,
as
shown in the photo on the next page. Note that there may or may not be a black connector on the pins at LK3. If a
connector is present, it will be placed over
one
pin
on the right, or two pins on the left
.
3.
If there is no black connector at LK3, you will need to temporarily use a jumper from another location on the board; make
note of which jumper you “borrow” so that you can replace it after this procedure is completed. There are 2-pin connectors
located at links LK1 and LK2, as shown in the photo below; use one of these, if necessary. Gently pull the jumper straight up
and off of the pins.
4.
Cover
both
of the pins
or the right two pins
at LK3 with the jumper. Disconnect the detector ribbon cable at the location
shown in the photo on the
next page.
5.
Connect the analyzer to your computer using the RS-232 cable included with the instrument.
6.
Power the instrument on.
7.
Run the LI-820/LI-840 Instrument Embedded Software update utility (download at
http://www.licor.com/env/Products/
GasAnalyzers/li820/820_software_download.jsp
for LI-820, or
http://www.licor.com/env/Products/GasAnalyzers/li840/
840_software_download.jsp
for LI-840)
a.
The file is compressed (zipped); you can choose to save the file to your computer, or run the program from the web page
and extract to your computer.
b.
You will be prompted to extract the program; make sure the ‘Run after extraction’ check box is enabled, as shown below.
After extraction, click Yes to run the program.
c.
Choose the COM port to which the analyzer is connected to the computer, and click the Update Software button. The
update is complete when ‘update successful’ is displayed.
(over)
