PL measuring device

Field measuring device to record the air permeability of soils with two-stage throat (extended range of measurement). Additional connections to electronic soil tensiometer and moisture probe. Integrated microcomputer for input of calibration data of different measuring chambers, for test site description, and for storing the data measured with the connected sensors.

Measuring principle:

A suitable measuring chamber produces a defined air flow in the test soil volume. Its flow rate is deter-mined from the pressure gradient over a calibrated throat in the PL 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.

Air permeability (PL) characterises the water-free pore space of the soil. It is a function of the water content. It is derived from the test parameters according to DARCY’s equation and displayed by the measuring device.

Different measuring chambers are available to match specific site requirements:

• PL measuring chamber for homogeneous flow acc. to DARCY with integrated   pressure probe
• PL surface chamber for inhomogeneous flow in undisturbed soil volume
• PL sampling ring adapter for measurement of ring samples

Technical parameters: 

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