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 the test).
• Coating of the test chamber is convenient in cleaning and resistant to chemicals. 
• The lock is designed to close the chamber door at a time.
• Indication of transmission rate and smoke density with improved accuracy.
• Chamber preheat system to facilitate the test with more accuracy.
• Safety blow-out panel system to protect the user when pressure is sharply increased during the 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 an auto leakage test.
• Portable water cooling system without the 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 the 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: