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Month: October 2007

Using the LI-7000 to Measure Small Volumes of CO2

Using the LI-7000 to Measure Small Volumes of CO2

In some gas exchange applications, only a small volume of gas (5 ml or less) is available for measurement (as when measuring the respiration of insects or a single fruit, for example). Because this volume is too small to flow through the LI-7000 in a normal fashion, CO2 concentrations must be measured with a different technique. An application note is available that describes this procedure, which involves drawing the small volume of gas into a syringe and injecting it into…

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6400regulator
LI-6400 CO2 Injector Maintenance

LI-6400 CO2 Injector Maintenance

One of the most frequent maintenance issues encountered at LI-COR is clogging of the 6400-01 CO2 Injector filters due to oil present in the CO2 cartridges. There are a number of brands of CO2 cartridges; some have more oil present than others. When using cartridges supplied by LI-COR, we recommend that you inspect the filter after using 25 CO2 cartridges. With other brands of cartridges (e.g. Crossman, Copperhead) you may need to inspect the filter after using a single cartridge,…

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LI193
Obtaining Correct (Positive) Values with LI-COR Underwater Radiation Sensors

Obtaining Correct (Positive) Values with LI-COR Underwater Radiation Sensors

The LI-192 Underwater Quantum Sensor and LI-193 Spherical Quantum Sensor from LI-COR are terminated with two pins that mate with the underwater cable (Figure 1).

In order to obtain the correct (positive) readings when using the underwater sensors, it is important to attach the sensor and underwater cable correctly. There is a yellow dot on the sensor connector (Figure 3) that should be aligned with the raised nub on the sensor cable before pushing them together. If the dots are…

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8100jumper keypad
Automatic Restart Function after Power Interruption with the LI-8100

Automatic Restart Function after Power Interruption with the LI-8100

The LI-8100 has the capability to restart a measurement following a power interruption to the instrument. Enabling this feature requires the user to first reposition a small jumper in the Analyzer Control Unit housing. When the jumper is repositioned, power will be restored to the instrument when it becomes available; note that this function is available only when the LI-8100 is powered via the Auxiliary Sensor Interface, and is not available when powered by a battery inside the Analyzer Control…

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miscanthus
Cellulosic Biomass Study of Miscanthus x giganteus and the LI-6400

Cellulosic Biomass Study of Miscanthus x giganteus and the LI-6400

The use of blended fuels has become a nearly ubiquitous part of our everyday lives. Lately, however, ethanol production has come under increasing scrutiny; questions abound concerning the efficiency of corn ethanol as a renewable source of energy, the possibility of widespread deforestation for the purpose of creating tillable land, and the rising cost of food due to the diversion of grains from human or animal consumption into a fuel additive. Ethanol, however, can also be made from cellulosic biomass,…

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