NBS Smoke Density Chamber

The main principle is to measure the smoke density generated by the burning or radiation of cables or materials in a specific space and under specific conditions. The optical beam is attenuated when passing through the smoke, and the light transmittance can be used to calculate ratio of the optical density and smoke density. It is equipped with a conical radiation furnace with a heat flux density of up to 50kW/m2. The sample is placed horizontally and the mass loss rate of the sample can also be tested.

Standard:
• ISO 5659-1:2024: Plastics – smoke – Part 1: Optical Density Test Principle
• ISO 5659-2:2017: Plastics smoke generated -Part 2: single box test to obtain optical density of the material

Chamber structure:
• The tester is consist of cabinet, sample case, the radiation cone, an igniter, a light source, a measuring device and other related control devices;
• The structural design and control design fully consider ergonomics; the test chamber adopts a full-open door design; the lock design facilitates one-time door closing; and optimizes the operation process;
• The test chamber is equipped with a full-open door, which is convenient for loading and unloading samples and cleaning the chamber;
• The front door is equipped with a hinge with a window, and an opaque shading plate is provided on the window to block the movable window to prevent light from entering the sealed chamber;
• The controller is located on the side of the chamber for easy operation. When the chamber door is closed, it does not affect the sight of the controller;
• The safety flameout board is easy to replace and safer to operate;
• A gas measurement port is provided for gas toxicity testing;
• The test chamber is easy to clean and the coating is chemically resistant.

Combustion means:
• The heating cone: Power 2600W, input temperature range of 0 ~ 1000 ºC, can be stable within ± 2 ºC within 50 minutes, providing irradiance of 10KW / m²-50KW / m²;
• The use of mass flow controllers and differential pressure sensor can improve the accuracy of piezo meters and automatic leak test;
• Ignition with automatic ignition devices; flame length 30mm ± 5mm; in accordance with standards prescribed blue flame with a yellow tip.

Smoke density measuring system:
• Smoke density and temperature are digital display, viewing more convenient, more accurate values;
• Photo detector assembly includes a photomultiplier, amplified filters, shutters, filters, neutral density filter, a lens, an optical window, and other components;
• The light source is 6.5V incandescent light sources;
• The installation of optical cartridge box at the top, light accepted as side-on photomultiplier, light transmission rate of 0.001% accuracy can be achieved;
• Achromatic lens;
• Japan imported Photomultiplier tubes;
• High-gain low-noise amplifier control circuit.

Control System:
• Automatic completion of the test;
• Automatic acquisition of various signals; 
• Computer to print the test report; 
• The printer is optional; 
• Voltage: 220V Power 4KW;