e.jpg)
| Air Permeability Meter |
| model PL300 |
|
|
| PL measuring devices |
14700 |
PL 300 | 147010 | TDR –moisture probe |
| 147020 | PL-tensiometer (0-5V) | ||
| 147030 | Calibration throat | ||
| 147040 | PL-sampling ring adapter | ||
| 147050 | PL-surface chamber | ||
| 147060 | PL- DARCY- chamber |
| PL 300 |
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 determined
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 | PL-100 | PL-300 |
| Measuring range of air permeability ca. | 0,006 ... 2 cm/s | 0,003 ... 3 cm/s |
| Measuring pressure | 1 ... 3 hPa | 1 ... 3 hPa |
| Stabilitation time | ca. 2s | ca. 2s |
| Chamber diameter | 72 mm | 72 mm |
| Tension measuring range | - | 0 ... 800 hPa |
| Soil water measuring range | - | 0 ... 60 Vol. % |
| Data memory | - | ca. 1000 measurements |