Soil Water Samplers:
Soil water samplers
(in the form of lysimeters or porous ceramic cups), have been used
extensively over the past 30 years for monitoring the chemical composition of
The principle of operation is
the reverse of that of a tensiometer. The samplers are buried in the soil at
the depth of interest, and a partial vacuum is created in the sampler which
causes water in the surrounding soil to enter the sampler via a porous ceramic
filter. A sample of water is extracted from the sampler for subsequent laboratory
Soil Monitoring Engineering currently
manufacture the following types of soil water samplers:
These 22.5 mm samplers comprise
an 85mm long ABS body which is attached to a 60mm long porous ceramic
filter. The sampler can be installed at depths up to 1m and is connected
to the surface via a pair of 1/8" diameter flexible nylon tubes.
These samplers are particularly suited to situations where they are required
to remain in-situ for a number of years (the flexible tubing can be coiled
up and buried during cultivation/tillage).
These 22.5 mm samplers are
suitable for situations where there is a need to install and remove the
samplers at regular intervals. They comprise a 22.5mm rigid ABS extension
from the standard sampler to the soil surface.
These 50mm diameter samplers
are suitable for situations where there is a need to:
a) extract larger volumes
of water, and
b) remove the sampler before
They comprise a 60mm long
ceramic filter which is connected to the soil surface via a 50mm diameter
rigid PVC tube.
Buried 50mm Diameter:
This variation on the standard
50mm diameter suction sampler is suitable for situations where larger
volumes of soil water are required, but where the sampler will remain
in-situ for a number of seasons. These samplers comprise a short sampler
body which is connected to the soil surface via 6mm diameter flexible
nylon tubing. This tubing can be coiled up and buried during annual cultivation/tillage.