The PL-300 is a field measurement instrument to determine the pneumatic conductivity of soils. This value describes the water-free pore space of the soil and is a function of water content.

Functionality

A defined air flow is generated using a measurement chamber in the soil volume investigated. The rate of flow is determined from the drop in pressure through a calibrated two stage measurement throttle in the PL instrument. The pressure difference above the soil volume is recorded by a further pressure sensor and supplies the pressure gradient of this flow. The pneumatic conductivity is calculated from these test parameters using the DARCY equation and shown in the instrument display.

The PL-300 also has connections for an electronic soil tensiometer and a moisture probe so that soil tension and /or soil moisture may be recorded parallel to each other. For this purpose, UGT provides a specially adjusted Tensio 150 tensiometer and a TDR moisture probe each with the suitable plug. The data of all connected sensors as well as the calibration data of the measurement chambers and a marking of the measurement point are saved and managed by a microcomputer within the instrument. Its compact and tough design make the PL-300 a practical and portable field measurement instrument.

Measurement chamber

In accordance with the requirements of the location, different measurement chambers are available:

• PL-300 measurement chamber for homogenous flow according to dArCY with integrated pressure probe
• PL-300 surface measurement chamber for inhomogeneous flow in undisturbed soil volume
• PL-300 soil sample ring adapter for the measurement of soil sample rings

• 1 x Device case with quick guide in the lid
• 1 x Interface cable
• 1 x Charger with plug
• 1 x Measuring chamber