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Soil-Air Permeameter

The soil pore system is dependent on the quantity, shape and continuity of pores. It can be described by the water and air permeability of the soil. Permeability to fluids is quantified by hydraulic conductivity or air permeability, respectively. Eijkelkamp Agrisearch Equipment supplies a comprehensive air permeameter set to measure air permeability, soil moisture tension […]

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The soil pore system is dependent on the quantity, shape and continuity of pores. It can be described by the water and air permeability of the soil. Permeability to fluids is quantified by hydraulic conductivity or air permeability, respectively. Eijkelkamp Agrisearch Equipment supplies a comprehensive air permeameter set to measure air permeability, soil moisture tension and volume percentage soil moisture in the field and in the laboratory.

Air permeameter to measure and register the air permeability of soil and soil samples (in situ and in the laboratory)
The very comprehensive set includes a standard air permeameter for connection to various types of measuring chambers. In the set 3 different chambers are included to measure:

· homogeneous flow according to Darcy, with integrated pressure sensor;
· in-homogeneous flow in undisturbed soil;
· air permeabilty in undisturbed samples.

Measuring principle
By analogy to hydraulic conductivity, air permeability is defined according to Darcy’s equation as the factor of proportionality between the rate of airflow and the pressure gradient along the flow distance. The air permeameter realizes the respective flow forms with different measuring probes. A suitable measuring chamber produces a defined air flow in the test soil volume. Its flow rate is determined from the pressure gradient over a calibrated throat in the measuring device. The pressure difference over the soil volume that has been passed by the flow is recorded by another pressure sensor and provides the pressure gradient of that flow.