The apparatus is designed to measure the smoke density from the burning or decomposition of plastics as per the requirement of the ASTM D 2843 standard. The apparatus consists of smoke chamber and control console.
The white background will permit observations of the flame, smoke and burning characteristics of the material. The viewing of the exit sign help to correlate the visibility and measured values. The specimen is supported on a 64 m.m. base and is equidistant from all sides of the chamber. The screen will lie on a stainless steel bezel supported by a rod through the right side of the chamber.
From the same rod a similar bezel located.
This rod supports a square of asbestos paper which cactus any material that drip from the specimen during the test. By rotation of the specimen holder rod, the burning specimen is quenched in a shallow pan of water positioned below the specimen holder.
At the above location and out side the chamber tubular boxes containing the light source with necessary lens and mirror on one side and a special photocell with a set of baffles to prevent stray light, on the other side are provided. The light source is fitted inside the tubular box on the left hand side of the chamber.
The source consists of a lamp with a regulated power supply fitted with a reflector mirror, and a converging lens. The reflector lens arrangements make the light beam on the photocell housed in the right hand side box.
The percentage of light absorbed will be displayed through a linear amplifier digital electronic photometer with 0% to 100% absorbency scale with auto calibration system.
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