Smoke Density Chamber ASTM E662, BS 6401

Smoke Density Chamber ASTM E662, BS 6401

Description:

The working principle of the NBS smoke density test chamber is to calculate the specific optical density by measuring the light transmittance of the smoke (in %) using the built-in optical system of the test chamber. The minimum light transmittance is usually used to calculate the maximum specific optical density Ds.

The formula is: Dsmax=132Log10(100/Tmin).

Tmin is the minimum light transmittance during the test.

The NBS smoke density test chamber consists of the following components:

The test chamber, with internal dimensions of 914mm x 914mm x 610mm, has good corrosion resistance.

Built-in optical measurement system.

Radiant heat source.

Data acquisition system.

Operating software.

In the smoke density test, the sample is mounted horizontally/vertically in the test chamber and its upper surface is exposed to a radiant heat source of a specific irradiance (up to 50 kW/m²). The generated smoke is collected in the test chamber and the attenuation of the light beam passing through the smoke is measured by the built-in photometric measurement system in the test chamber. The data and results are collected and calculated by the software.

Main feature:

• Integrated body and 19” analysis rack (Saving space).

• 17” touch screen panel type PC for the whole control and automatic testing.

• Air cylinder type movement to load sample or automatically open the up/down  vent(highly resistant to pollution from test).

• Coating of the test chamber convenient in cleaning and resistant tochemicals.

• Lock designed to close the chamber door at a time.

• Indication of transmission rate and smoke density with improved accuracy.

• Chamber preheat system to facilitate test with more accuracy.

• Safety blow-out panel system to protect user when pressure is sharply increased during test.

• Port, heated filter, and heated line to measure toxic gases.

• Manometer gauge with increased accuracy by using the MFC (Mass Flow Controller) and DPT(Differential Pressure Transducer) enabling auto leakage test.

• Portable water cooling system without need for waterworks and plumbing when using the Heat Fluxmeter (for ISO 5659).

• Load cell with increased accuracy to measure mass loss rate in ISO 5659 test.

• SB 2005 DAQ(Data Acquisition) Program to control the use of touch screen panel PC.

Test result:

• Laboratory Information

• User’s CI

• Specimen Conditions

• Time from start of test, t(s)

• Transmission(%) and specific optical density, Ds

• Maximum Ds and time to maximum Ds

• Correction Ds

• Current range setting and filter position

• Current mass(g) for ISO 5659

Specification: