Soil Monitoring Engineering - Tensiometers and Water Samplers	Church End House, Eversholt, Milton Keynes. MK17 9DU. UK Tel/Fax: +44 (0) 1525 280295 Email:richard@soilmonitoring.com (Est. 1989)

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 soil water.

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 analysis.

Soil Monitoring Engineering currently manufacture the following types of soil water samplers:

Standard 22.5mm Diameter:

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).

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Extended 22.5mm Diameter:

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.

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Standard 50mm Diameter:

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 annual cultivations.

They comprise a 60mm long ceramic filter which is connected to the soil surface via a 50mm diameter rigid PVC tube.

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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.

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