Support: LI-7810 CH₄/CO₂/H₂O Trace Gas Analyzer

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Calibration information is available for light sensors, gas analyzers, photosynthesis systems, calibrated chambers, calibrated light sources, and plant canopy analyzers.

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Frequently asked questions

What is the difference between the 7900-112 Reduced Flow Rate Kit and the 7900-113 Reduced Flow Rate Kit?

The 7900-112 kit is the original reduced flow rate kit. It provides different intake and outlet flow rates, and therefore is unsuitable for closed-loop applications. To use this kit, you must install it, select the software setting, and then start the instrument. This kit is supported by firmware version 2.0.25 and newer.

The 7900-113 kit is a replacement for the older 7900-112 kit. The new kit provides the same inlet and outlet flow rate, and therefore is suitable for closed-loop applications. The new kit is supported by firmware version 2.4 and newer. The flow rate with the 7900-113 is around 70 sccm.

Can I use the original low flow rate kit with new firmware?

Yes. Be sure to select the flow configuration, and then restart the instrument after installing the kit. If the kit has been removed, restore the default flow configuration and restart the instrument.

The instrument issues a SVC required message during startup. What is wrong?

The LI-7810, LI-7815, and LI-7820 both may issue a series of messages as the instrument warms up and passes through various warm up tests. It may display this message during this time. The message (and all warnings) should be resolved within 30 to 60 minutes after powering up. It may take a little longer under some circumstance. If the error persists after restarting and allowing the instrument to run for 60 to 90 minutes, contact LI-COR or your sales representative.

What filter should I use to filter the air inlet?

Your LI-7810 will include either 9978-193 or 9978-234 filters. 9978-193 filters were included with early instruments. 9978-234 are included with later instruments. Either filter is suitable, however, 9978-234 provides additional protection against water being drawn into the inlet.

Use one (1) of the 9978-193 filters.
Use two (2) of the 9978-234 filters.

What is the difference between the LI-7810 and the LI-7700?

The LI-7700 is an open path instrument that is designed for eddy covariance measurements. It measures methane. The LI-7810 is a closed path instrument designed for field and bench-top measurements. Although it has higher precision methane measurements than the LI-7700, at one measurement per second, the LI-7810 does not measure quickly enough for most eddy covariance applications. The LI-7810 measures CH₄, CO₂, and H₂O.