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Dual Chamber Stainless Steel Suction Lysimeter

The dual chamber lysimeter is recommended for sampling unsaturated or saturated materials at depths greater than10 feet (3 m). During sampling, vacuum is applied to the vacuum/pressure line, while keeping the fluid return line closed. For moist soil the optimum vacuum is about 300 mbar. Vacuum can be supplied with the battery powered vacuum pump […]

  • SKU : E-144-SW-070, G-144-SW-070A
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The dual chamber lysimeter is recommended for sampling unsaturated or saturated materials at depths greater than10 feet (3 m).

During sampling, vacuum is applied to the vacuum/pressure line, while keeping the fluid return line closed. For moist soil the optimum vacuum is about 300 mbar. Vacuum can be supplied with the battery powered vacuum pump (G-144-SW-073). The partial vacuum in the lysimeter draws pore water into the lower chamber of the lysimeter through its porous stainless steel walls. From there it is drawn into the upper chamber where it is stored. The fluid is brought to the surface by applying positive pressure to the vacuum/pressure line and opening the fluid return line, forcing the fluid up to the surface and into a collection bottle. A stainless steel check valve prevents back flow of the fluid from the upper chamber into the lower chamber and the soil around the lysimeter. Sampling duration depends on the amount of sample required, the soil type, and the soil moisture content. Sampling times can vary from less than 1 hour in wet soil, to more than 1 day in drier soil.