This equipment is used to test the permeability of granular soils as sands and gravels. The specimen is formed in an acrylic permeability cell, and water is passed through it from a constant level tank.Pressure take-off points located along the sides of the permeability cell are connected to three manometer tubes mounted on a panel complete with a metre scale. Water passing through the specimen is collected and measured, either for specific quantity or over a period of time. The reduction of head is noted from the variation of level in the manometer tubes.

CONSTANT HEAD PERMEABILITY CELL, - comprising an acrylic plastic body, nominally 75 mm. ID, held between two non ferrous end plates. The unit has three pressure take-off points.

CONSTANT HEAD PERMEABILITY CELL, - comprising an acrylic body nominally 114 mm. ID, Construction similar to mod. S245/1 but with six pressure take-off points and an additional six blanked-off pressure points. Any combination of six pressure points can be used to suit particular testing requirements. When using this cell, two manometers panels mod. S245/3 will be required.

MANOMETER TUBES AND STAND, comprising three glass tubes of constant bore, metre scale and connecting tubing or cell pressure take-off points, all mounted on a free-standing panel,

The inlet, outlet and overflow pipes are fitted to the base of the tank and can be adjusted for height within the tank.