When ordering CO₂ cartridges directly from LI-COR or a LI-COR distributor, use the part numbers given below.

If ordering directly from LI-COR, Lincoln, NE, USA:

• 9968-227: 8-gram CO₂ cartridges (qty. 25) to be used with the LI-6800
• 9964-037: 12-gram CO₂ cartridges (qty. 25) to be used only with the LI-6400 and LI-6400XT

If ordering from LI-COR GmbH, Germany:

• 100-9968227: 8-gram CO₂ cartridges (qty. 25) to be used with the LI-6800
• 100-996437: 12-gram CO₂ cartridges (qty. 50) to be used only with the LI-6400 and LI-6400XT

To contact LI-COR please email us, or you can contact a distributor in your country.

If shipping restrictions make getting CO₂ cartridges directly from LI-COR or our distributors too costly, or take too long, you can use food grade CO₂ cartridges. Cartridges used in the production of carbonated water work well with the LI-6400/XT and LI-6800. Avoid the use of CO₂ cartridges that are used in paint-ball guns or cartridges that are not food grade. These cartridges can contain high oil content. If oil gets into the system, it may cause damage that must be repaired at the LI-COR factory.

If you buy CO₂ cartridges from a supplier other than LI-COR, be sure to select high-quality oil-free 8-gram CO₂ cartridges. Food-grade (culinary) CO₂ chargers are available from ISI (culinary.isi.com/) and LISS (liss-group.com/culinary/).

For both the LI-6800 and LI-6400/XT you can use 8-gram cartridges. For the LI-6800 you can use them as is, with no modification required. For the LI-6400/XT you need a spacer in order to compensate for the shorter height of the 8-gram cartridges compared to the 12-gram cartridges.

When replacing the cylinder, you may also want to replace the O-ring if it leaks. O-rings are included with the spare parts kit for your instrument and available for purchase.

Description	Part Number
LI-6400/XT CO2 injector maintenance kit	9964-041
O-rings	192-04369
Filters for oil	301-04472
Filter removal hook	6564-142
LI-6800 CO2 injector O-rings	192-14864

Making a spacer to use the 8-gram CO₂ cartridges in the LI-6400/XT

One of the simplest ways is to use a stack of coins. You can use any coin that can fit in the LI-6400/XT’s CO₂ cartridge container; for this example, we used 14 U.S. pennies.

Alternatively, a copper tube (1.5 cm diameter and 2.0 cm height) can be used.

A copper spacer or a stack of coins will compensate for the reduction in size that the 8-gram cartridges require, when compared to the 12-gram cartridges.

If you have any questions, please contact us.