Two survey chambers are available: 8100-102 (10 cm) and 8100-103 (20 cm). Both chambers operate with a unique pneumatic system that contracts and expands a bellows to raise and lower the chamber over the soil collar. This automation eliminates soil disturbances that would otherwise occur with mechanical installation and removal of the chamber from the collar between sampling repetitions. The pneumatic bellows system raises the chamber between repetitions to allow for equilibration with ambient CO2 and H2O concentrations, before gently lowering again to perform another repetition. As a result, erroneous flux rates, induced by mechanical soil disturbance, are greatly reduced.

8100-102 (10 cm), 8100-103 (20 cm) For fast, repeatable measurements 10 or 20 cm diameter chambers Pressure/vacuum bellows system to raise and lower chamber Double gasket system to prevent leaks

8100-102 Survey Chamber (10 cm)

Choosing between survey chambers may be a function of the available measurement space, where a smaller chamber fits better than a larger chamber. The 8100-102 10 cm chamber allows researchers to fine tune chamber placement more easily. In row crops, for example, more measurements can be performed with the 10 cm chamber over the available space within and between rows, which is helpful when studying CO2 flux across the root zones of various crops.

8100-103 Survey Chamber (20 cm)

The 8100-103 20 cm chamber is exposed to a larger soil area, enabling better spatial averaging of CO2 flux over heterogeneous soils. The 20 cm chamber also uses the same soil collars as the long-term chambers. Switching between a 20 cm Survey and a Long-Term chamber is easily done.