LI-8150 Multiplexer and LI-8100A Analyzer Control Unit

Multiplexed

Multiple Chambers for Long-Term, Unattended Measurements

The LI-8150 Multiplexer greatly expands the capability of the LI-8100A and provides a simple solution that satisfies both temporal and spatial resolution requirements for monitoring CO₂ flux. Designed exclusively for use with the LI-8100A, the LI-8150 allows up to 16 chambers to be connected to provide adequate spatial coverage. The system's automation enables long-term, unattended measurement of diel and seasonal flux patterns.

Connect up to 16 Long-Term Chambers
30 m (98.4 ft) diameter coverage
Easy connection to the LI-8100A Control Unit (ACU)

Single gas analyzer in the LI-8100A prevents measurement bias
Conduct vertical atmospheric CO₂ profile measurements

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Managing Spatial and Temporal Variability

Because of the inherent variability of soils, conducting measurements at multiple locations is often necessary to obtain a reliable mean soil CO₂ flux value. For example, a relatively uniform site with a coefficient of variation (CV) of 10% may require approximately 15 flux measurements at different locations to obtain a mean value with a measurement uncertainty of about 5%.

In addition to spatial heterogeneity, soils also exhibit both diel and seasonal patterns of variation in CO₂ evolution due to changes in soil water content, temperature, carbon resources, and other factors. To accurately obtain site CO₂ fluxes, measurements with sufficient temporal and spatial resolution are required.

Modular Construction

The LI-8150 easily connects to the LI-8100A Analyzer Control Unit and allows the researcher to choose an optimum number of chambers with the flexibility of adding more chambers as needed. An 8-port LI-8150 can take up to 8 chambers and can easily be upgraded to 16 ports for 8-16 chambers with a factory upgrade or field upgrade kit. Critical design features ensure measurement accuracy regardless of how many chambers are used.

Inside the LI-8150 Multiplexer

The interior design of the LI-8150 Multiplexer features high quality, robust components for optimal performance and in-field serviceability:

Durable, gasket sealed weatherproof case.
Turck® weatherproof fittings for chamber electrical connections.
O-ring sealed, quick-attach sample air line connectors.
High flow, low power, long-life solenoid valves.
LED indicator panel displays diagnostic information.
Chamber actuator button closes all chambers for transport.
Diaphragm pump samples air streams with minimal pulsations.
Filter assemblies clean incoming air.
Inside view of a 16 port LI-8150 with labeled components.