7 Using the Long-Term
Chambers
General Description
The 8100-104 and 8100-104C Long-Term Chambers are designed to make long
term, diurnal measurements of soil CO
2
flux at a single location for weeks or
months at a time.
A unique, moveable design minimizes the effects of the chamber on the natural soil
conditions to give reliable results over long periods of time. A motor-driven strut
system moves the chamber away from the soil area to be measured, ensuring that
the area of interest is subjected to normal, undisturbed precipitation, temperature,
and shading effects. The low profile chamber design minimizes wind effects over
the measurement location.
A double gasket system seals the chamber outside of the soil collar, and between
the chamber and mounting plate, to minimize CO
2
leaks and wind effects. A
pressure vent at the top of the chamber prevents pressure spikes when the chamber
closes, and maintains the chamber pressure at the ambient level under calm and
windy conditions.
The 8100-104 and 8100-104C (Clear) Long-Term Chambers are designed
primarily for use with the LI-8150 Multiplexer. The 8100-104/C have three
integrated sensor inputs; sensors attached to these inputs can only be monitored
when the chamber is connected to the Multiplexer. If the 8100-104/C is used in
single chamber mode with the LI-8100A, auxiliary sensors must be connected to
the Auxiliary Sensor Interface, not the chamber itself.
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