Constant Flow Type Air Permeability Apparatus (Lea & Nurse Type)

Constant Flow Type Air Permeability Apparatus Lea and Nurse Type

Used for measuring the specific surface of powdery materials expressed as total surface area in square cms per gram of the material.
Dry air at a constant velocity is passed through the prepared bed of material contained in permeability cell.
The pressure drop across the bed of material and the rate of air flow are measured by the manometer and flow meter respectively.
The apparatus comprises the following :-
A Permeability cell complete with a perforated plate, rubber ‘O’ ring and plunger.
Wooden stand fitted with a manometer, a flow-meter and a capillary tubing.
10 Nos. filter paper discs.