UGT Suction probe S20 with ceramic tip and standpipe

The suction probe S20 is our standard model for use in lysimeters or for underfloor installation. It is equipped with a ceramic tip (P80; Ø20 x 50 mm) that is firmly glued into a standpipe up to 90 cm long. A suction hose is connected to the ceramic tip and leads from the standpipe to the soil surface or to the edge of the lysimeter. Outside the soil or lysimeter, the suction hose exits the standpipe and is connected to a separate sampling vessel. The hoses and hose connections are made of inert PE to prevent contamination of the samples.

How it works

By applying a vacuum, the soil water is sucked out of the soil through the suction cup and collected in the connected sampling bottle. The suction probes are suitable for both permanent constant vacuum in combination with a suction probe system and for a single application of a vacuum. The prepared hose connections allow operation with all commercially available hand pumps, electronic pumps and vacuum control units.

Use of a groove auger during installation

For optimal installation of the suction probe in the soil, we recommend using a suitable groove auger. This tool is used to pre-drill a hole with a diameter that is slightly smaller than that of the suction probe. A diameter that is too large can favor preferential flow paths along the suction probe, causing additional water to be directed to the suction cup. This could falsify the measurement results. The appropriate pre-drill not only makes installation easier, but also ensures a proper connection between the suction probe and the surrounding soil, which ensures precise sampling.

Further general information can be found at suction probe.