Product Information


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

PL-300 measurement chamberfor homogenous flow accordingto DARCY with integrated pressureprobe

  • 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
  • PL-300 sampler probe for the measurement in deeper soil horizons





use of the PL-300 in the lab with soil samples 250 cm³





Technical Specifications

Technical Specifications

Measurement range for pneumatic conductivity:0,003 ... 3 cm/s
Measurement pressure:1 ... 3 hPa
Settling time:ca. 2 s
Diameter of the measurement chamberr:72 mm



Order Numbers + Accessories


Ordering Details:

Art.-Nr.:  147000  




Related Products:

PL-300 TDR moisture probe

For the parallel measurement of the soil moisture and pL

Suitable for PL-300

PL-300 Tensio 150 pressure transducer

For the parrallel measurement of soil
moisture tension and pL

Suitable for PL-300

PL-300 calibration valve

For the calibration of the PL-300

Suitable for PL-300

PL-300 soil sample ring adapter

pL measurement of the soil sample ring

Suitable for PL-300

PL-300 surface chamber

pL measurement of undisturbed soil

Suitable for PL-300

PL-300 measurement chamber
according to DARCY

pL measurement with homogenous flow

Suitable for PL-300

PL-300 sampler probe

Suitable for PL-300




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Fax: +49 (0) 33432 - 89 573

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Tel.: +49 (0) 8161 - 23 46 441
Fax: +49 (0) 8161 - 23 46 443