Constant / Falling Head Permeability Apparatus Set is used to determine the coefficient of permeability for the laminar flow of water through granular soils. These economical Permeameters have the versatility for use with either constant head or falling head methods. Each set includes a permeameter, Single Tube Manometer with Constant Head Reservoir, and Porous Stones or Perforated Plates, depending on permeameter size. They are not equipped with sidewall manometer ports, therefore do not meet requirements of ASTM / AASHTO methods. Permeameters are offered with inside diameters from 2.5in (63.5mm) — 9in (228.6mm) and are sized for sample lengths two times the diameter.
All models have clear acrylic chambers for observation during testing and anodized aluminum end caps. A spring applies 5-10lb (2.2-4.5kg) of force against the top stone or screen to prevent soil density changes during the test. Each chamber is equipped with valves, fittings, and either Porous Stones or Perforated Plates. Porous Stones are provided for 2.5in (63.5mm) through 4.5in (114.3mm) diameter models and Perforated Plates are included for 6in (152.6mm) and 9in (228.4mm) versions.
Model 3891: 2.5in (63.5mm) Diameter
Model 3892: 3.0in (76.2mm) Diameter
Model 3893: 4.5in (114.3mm) Diameter
Model 3894: 6.0in (152.4mm) Diameter
Model 3895: 9.0in (228.6mm) Diameter
3891: 12.0lb (5.44kg)
3892: 12.0lb (5.44kg)
3893: 15.0lb (6.80kg)
3894: 18.0lb (8.16kg)
3895: 36.0lb (16.33kg)
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