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Enabling better global research outcomes in soil, plant & environmental monitoring.

Tempe Cells

The Model 1400 Tempe Pressure Cell is used to determine the water-holding characteristics of a soil sample in the 0 to 1 bar pressure range. The cell accepts an undisturbed soil sample contained in a 2-1/4" (5.7 cm) diameter cylinder, such as that taken with the Model 0200 Soil Core Sampler. Smaller cores may be placed inside the 2-1/4" diameter brass cylinder if desired. The Tempe cell comes with top and bottom Plexiglass plates, a porous ceramic plate, a brass cylinder, and all sealing and connecting hardware. A variety of porous ceramic plates and brass cylinders are available. An external pressure source is connected to the Tempe cell using Neoprene tubing.

The Model 1405 Tempe Pressure Cell is used to determine the water-holding characteristics of a soil sample in the 0 to 1 bar pressure range. The cell accepts an undisturbed soil sample contained in a 3-1/2″ (8.8 cm) outside diameter cylinder, such as that taken with the Model 0212 Soil Core Sampler. Smaller cores may be placed inside the 3-1/2″ diameter brass cylinder if desired. The tempe cell comes with top and bottom Plexiglass plates, a porous ceramic plate, a brass cylinder, and all sealing and connecting hardware. A variety of porous ceramic plates and brass cylinders are available. An external pressure source is connected to the Tempe cell using Neoprene tubing.

Tempe Cell Stands

The Model 1425 Tempe Cell Stand provides a convenient location to place Tempe Cells while in operation, or to store while not in use.

Tempe Pressure Cells Features

In order to use this type of extraction equipment effectively, it is important to under the physical principles involved in its use. The Tempe Pressure Cell provides a simple method to determine soil moisture-retention curves or the “moisture characteristic” of undisturbed soil cores in the 0-1 bar range. This moisture characteristic of field soils is readily and very accurately determined by weighing the complete cell at pressure equilibrium points. Prior to making a run, the soil sample – together with the porous ceramic plate – is saturated with water. Air pressure is then applied to the Tempe Pressure Cell to effect extraction of moisture from the soil sample under controlled conditions. When air pressure inside the Tempe Cell is raised above atmospheric pressure, the higher pressure inside the Tempe Cell forces excess water through the microscopic pores of the porous ceramic plate and out through the Water Outlet Drain Tube. The high pressure air will not flow through the pores of the porous ceramic plate since they are filled with water. The surface tension of the water in the pores at the air-water interface supports the pressure, much the same as a flexible rubber diaphragm.