Determining The Dry Weight - UMS HYPROP Operation Manual

Determining the dry weight

HYPROP needs the dry weight of the soil sample to be able to calculate the
volumetric water content based on the weight reduction. Therefore the sample
has to be weighed after the measuring campaign.
Put the soil sample in a bowl (ideally
in a heat resistant one, so that you
can put it in the oven for drying).
Open the clips of the sensor unit.
Cautiously remove the sample ring.
Do not tilt the sample ring. If you do
so you may break the tensio shafts.
Note
If the soil sticks too tightly to the sensor unit (which is often the case with clayey soils) put the
sample ring with the sensor unit upside down in water. The water level should be above the
rim of the sample ring. If necessary leave it in the water over night. Then the sample ring can
be removed more easily.
Collect the soil material completely in
the bowl.
67 | Determining the dry weight