Introduction:

NBS Smoke Index Test Device as proved to be one of the most versatile fire testing instruments since its inception in the 1980s.

It is the most widely accepted apparatus for the measurement of smoke from burning materials and measures specific optical density under flaming and non-flaming conditions. It is also used for the extraction of toxic gas.

NBS Smoke Index Test Device is satisfied with standards (ASTM E 662, BS6401, ISO 5659, NES 711, NEPA 258, etc).

Using ISO 5659 conical radiant heat furnace, we can change the heating condition from 10KW/m2 to 5KW/m2 according to user's requirements.

In the test of NES 711, there are non-flaming test and flaming test in test conditions different from ASTM E 662.
The main principle is to measure smoke density in a particular space, cable or material produced under specific conditions of combustion or 713 radiation. The smoke will cause the beam attenuate when passes through the smoke, the light transmittance be use to calculate ratio of the optical density and smoke density. The smoke density chamber is designed according to ISO5659 standard. It has a conical radiant furnace, heat flux can be up 50 kW / m2, and laterally positioned sample, it also can test the sample mass loss rate.
 

Standards:

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

Smoke Density Measuring Sytem:
1, Smoke density and temperature are digital display, viewing more convenient, more accurate values.
2, Photodetector assembly includes a photomultiplier, amplified filters, shutters, filters, neutral density filter, a lens, an optical window, and other components.
3, The light source is 6.5V incandescent light sources.
4, 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.
5, Achromatic lens.
6, Japan imported Photomultiplier tubes.
7, High-gain low-noise amplifier control circuit.

Control system:
1, Automatic completion of the test; automatic acquisition of various signals; And test report could be print from computer.
2.Dimension (mm): 2150 (H) x 1650 (L)x840 (D) .
3.Size of chamber: 610 mm (H) x 914 mm(L) × 914 mm (D).

Technical Parameter:
1, Light transmittance measurement range: 0 ~ 100%; Resolution is 0.00001%;
2, Accuracy of measurement is less than + / - 2.5%;
3, Light 6.5 V incandescent light; 2200+100k color temperature incandescent lamp;
4, Optical system for transmittance as linear response, measuring at least accuracy + / - 3%;
5, Photomultiplier tube filled with partial data acquisition precision 0.5%;
6, Heater input temperature 0 ºC ~ 1000 ºC, accuracy of plus or minus 2 ºC;
7, Import K type armoured thermocouple accuracy of 0.1 ºC;
8, Mouth thermopile type heat flow meter range is 0 ~ 80 kw/m2; The thermopile type heat flow meter, heat meter accuracy is 1%, repeatability and 0.5%;
9, Propane gas flow meter range: 0 ~ 100 ml/min. Minimum pressure of 3.5 kPa plus or minus 1 kPa;
10, Air flow meter range: 0 ~ 1000 ml/min.
11, Fan provides the negative pressure in the cabinet at least 0.5 kPa;
12, Enclosure bear greater than the atmospheric pressure at least 1.5 kPa;
13, Water pressure gauge 1.5 kPa (150 mm water column);
14, Wall temperature measurement range: 0 ~ 100ºC±1ºC;
15, Window heater power: 9 W;
16, Test the pressure inside the warehouse scope: < 1.5 kPa;
17, Radiation power range: 0 ~ 50 kW/m².