Knowledge of the permeability characteristics of soil is essential for construction projects where drainage is an important element. In particular, permeability is a key parameter for the design and assessment of landfill sites, the investigation of contaminated ground, the design of earth dams and sheet pile walls, and in assessing the potential for lowering groundwater levels.

Tri-Flex 2 One-Cell Permeability Test System

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The complete one-cell system consists of the Tri-Flex 2 Master Control Panel with water de-airing system, one Tri-Flex 2 Permeability Test Cell complete with platens for testing either 2.8” or 70 mm diameter specimens, and a complete range of sample preparation tools.With the Tri-Flex 2 One-Cell Permeability Test System, efficient and accurate permeability testing of a wide range of construction materials can easily be conducted.

Model No. Desc
25-6721 Porous disc 2.8″
27-1633 Pressure Transducer
25-6480 70mm Suction Membrane Device
27-1641 Volume change transducer assembly
25-0698 Tri-Flex 2 Water De-airing Tank System
25-0696/0x Tri-Flex 2 Control Panel
25-0690 Tri-Flex 2 Permeability Test Cell
27-1765 Permeability Software
25-6443 Membrane Tester 2.8″
25-6641 Membrane Sealing Rings 2.8″
25-6470 70mm/2.8 Inch Membrane Placing Tool
25-6441 Rubber Membrane 2.8"
25-0690/15 Acrylic Cap and Base Set 2.8″

Tri-Flex 2 Permeability Test Cell

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• Corrosion resistant construction.
• Double drainage lines.
• Accepts a wide range of samples.

The Tri-Flex 2 Permeability Test Cell incorporates many new features that promote ease in specimen preparation and installation. The cell consists of an aluminum alloy head assembly and a stainless steel base for corrosion resistance and long service life. Stainless steel no-volume change type valves at all specimen inflow and outflow ports provide additional corrosion resistance and prevention of pressure changes during permeability test procedures.

Through the use of the cell’s optional Platen Sets, the Tri-Flex2 Permeability Test Cell can accept specimens ranging in size from 1.4” (35 mm) to as large as 4” (102 mm) in diameter. Depending on test requirements, all Platen Sets are available in acrylic.

Model No. Desc
25-4461 Porous disc 1.4″
25-6721 Porous disc 2.8″
25-7761 Porous disc 4.0″
25-6561 Porous disc 70 mm
25-7661 Porous disc 100 mm
25-7621 Rubber Membrane 4"
25-0690 Tri-Flex 2 Permeability Test Cell
25-5661 2.416″ Porous Stones
25-6641 Membrane Sealing Rings 2.8″
25-4281 Membrane Sealing Ring 1.4"
25-5663 2.416″ Sealing Rings
25-0690/13 1.4″ Cap & Base Set
25-0690/14 2.416″ Cap & Base Set
25-0690/15 Acrylic Cap and Base Set 2.8″
25-0690/10 70 mm Cap & Base Set
25-0690/17 4.0″ Cap & Base Set
25-4261 Rubber Membrane 1.4″
25-5665 2.416″ Rubber Membranes
25-6441 Rubber Membrane 2.8"
25-6461 Membrane Sealing Ring 70 mm
25-7631 Membrane Sealing Ring 100 mm

Guelph Permeameter

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• Lightweight and portable for easy transportation.
• Test time of two hours or less.
• Requires only 2.5 liters of water.

The Guelph Permeameter is a constant head permeameter that measures in-situ hydraulic conductivity. It is a simple to operate, portable unit that requires very little training to use. Only one person is needed to perform the test.

The method involves measuring the steady-state rate of water recharge into unsaturated soil from a cylindrical well hole, in which a constant head of water is maintained. Calculations are made to determine the hydraulic conductivity, soil sorptivity and soil matrix flux potential. Depending on the soil type, tests can take between 1/2 hour and 2 hours using only 2.5 liters of water.

Model No. Desc
25-0655 Permeameter Extension Kit
25-0650 Guelph Permeameter

Double Ring Infiltrometer

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• Determines infiltration rate of various soils.
• Heavy-duty aluminum rings for rust resistance and long life.
• Graduated Mariotte tubes for inner and outer rings.

The Double-Ring Infiltrometer provides comparative information that is useful for determining erosion rates, leaching and drainage efficiencies, irrigation patterns, rainfall and evaluation of potential septic tank disposal fields.

The instrument consists of two concentric rings, driving cap, two graduated Mariotte tubes, square neoprene splash guards and complete instructions. The two rings are driven into the ground and filled with water. The outer ring acts as a barrier to encourage only vertical flow from the inner ring.

Model No. Desc
25-0660 Double Ring Infiltrometer

Constant Head Sand/Gravel Permeameters

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• Meets ASTM D-2434 Test Specifications.
• Supplied complete with tubing and hardware.
• Accessory Manometer Panel and Constant Head Tank Assemblies.

The Sand/Gravel Permeameter is used specifically for testing the permeability of granular soils. Manufactured in accordance with ASTM D-2434 test specifications, the permeameter is designed to provide accurate results when performing the constant head test method for the laminar flow of water through granular materials.

Each permeameter comes equipped with valves, porous stones and tubing for connection to a water source, vacuum, and manometer tubes. To prevent soil density changes during the test, a spring is incorporated in the top cap to apply 5 to 10 lbf. (2.2 to 4.5 kg) against the top porous stone.

Two manometer ports are grooved and screened on the inside of the chamber. The screens prevent material from migrating through the valves and tubing during testing. The acrylic chamber permits viewing of the sample during testing. The end caps and clamping ring are constructed of anodized aluminum for rust resistance and long service life.

Model No. Desc
25-0562 Constant Head Sand/Gravel Permeameters, 3" (76.2 mm)
25-0568 Constant Head Tank System
25-0567 Wall Mounted Manometer Panel

Manometer Panel

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The Manometer Panel features two acrylic tubes and valving mounted on an aluminum rail with a 100 cm long dualgraduated scale. Each tube has its own valve, making it possible to run two independent permeability tests.

Model No. Desc
25-0567 Wall Mounted Manometer Panel

Constant Head Tank System

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The system consists of an acrylic tank with regulating valve for flow control of water. A porous media is used at the bottom of the tank to filter out air bubbles.

The unit maintains a constant water head by utilizing an overflow port. It also allows for connection to a tap water or de-aired water source. A wall mounting support, consisting of two rails with adjustable height brackets and tubing for connection between the tank and permeameter is included.The system consists of an acrylic tank with regulating valve for flow control of water. A porous media is used at the bottom of the tank to filter out air bubbles.

Model No. Desc
25-0568 Constant Head Tank System

Compaction Permeameters

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• Available in either 4” (101.6 mm) or 6” (152.4 mm) diameter models.
• Sturdy construction for testing all types of materials.
• Overflow valve assembly permits easy air removal before testing.

Compaction Permeameters are designed for performing either constant head or falling head permeability tests on undisturbed, remolded or compacted soils.

Model No. Desc
25-0618 Compaction Permeameter 4″
25-0619 Compaction Permeameter 6″
25-0620 Constant and Falling Head Accessory Kit
T-319 Porous Stone for 25-0618
T-324 Porous Stone for 25-0619

Combination Permeameter Constant or Falling Head

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• Plated steel chamber head assembly.
• Rust-resistant cast aluminum base assembly.
• Includes accessories for conducting both constant and falling head permeability studies.

The Combination Permeameter is designed for laboratory determinations of permeability of either fine-grained or coarsegrained soils. Generally, soils containing 10 percent or more particles passing a no. 200 sieve are tested using the falling head assembly. More granular soils, containing 90 percent or more particles retained on the no. 200 sieve, are tested using the constant head assembly.

In constant head permeability testing, a plastic funnel reservoir with overflow port is mounted on an upright attached to the chamber head. A maximum head of up to 55 cm is possible by placement of the reservoir on the upright.

Falling head permeability studies are possible using the graduated pipette falling head reservoir which has a volume of 100 cc. Maximum head is 100 cm. Clear plastic chamber accepts 2-1/2” (63.5 mm) diameter specimens, ranging from 2-1/2” (63.5 mm) to 5-1/2” (140 mm) long.

Model No. Desc
T-308 Porous Stone 2.47″ x .50″
25-0623 Combination permeameter, 2.5" (63.4 mm)