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NFPA 270: Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber, 2013 Edition

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NFPA 270: Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber, 2013 Edition
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NFPA® 270 Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber 2013 Edition

NFPA® 270 Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber 2013 Edition

Chapter 1 Administration
1.1 Scope
1.2 Purpose (Reserved)
1.3 Application
1.4 Units and Formulas
Chapter 2 Referenced Publications
2.1 General
2.2 NFPA Publications (Reserved)
2.3 Other Publications
2.4 References for Extracts in Mandatory Sections
Chapter 3 Definitions
3.1 General
3.2 NFPA Official Definitions
3.3 General Definitions
Chapter 4 Test Apparatus
4.1 General
4.2 Test Chamber
4.3 Sample Support and Heating Arrangements
4.4 Gas Supply
4.5 Photometric System
4.6 Chamber Leakage
4.7 Cleaning Materials
4.8 Ancillary Equipment
Chapter 5 Test Environment
5.1 Light Interference
5.2 Product of Combustion Venting
5.3 Operator Safety
Chapter 6 Test Specimen
6.1 Suitability of Sample for Testing
6.2 Sample Face
6.3 Number of Specimens
6.4 Additional Specimens
6.5 Size of Specimens
6.6 Specimen Preparation
6.7 Wrapping of Specimens
Chapter 7 Setup, Calibration, and Maintenance
7.1 Setup and Calibration Procedures
7.2 Alignment of Photometric System
7.3 Selection of Compensating Filter(s)
7.4 Linearity Check
7.5 Calibration of Range-Extension Filter
7.6 Chamber Leakage Rate Test
7.7 Burner Calibration
7.8 Radiator Cone Calibration
7.9 Cleaning
7.10 Frequency of Checking and Calibrating Procedures
7.11 Total System
Chapter 8 Conditioning
8.1 Pre-Test
8.2 Conditioning
Chapter 9 Test Procedure
9.1 Initial Conditions
9.2 Tests with Pilot Flame
9.3 Preparation of Photometric System
9.4 Loading Specimen
9.5 Recording of Light Transmission
9.6 Observations
9.7 Termination of Test
9.8 Specimen Mass
9.9 Repeat Tests
Chapter 10 Calculations
10.1 Specific Optical Density, Ds
10.2 Clear Beam Correction Factor, Dc
10.3 Mass Loss
Chapter 11 Test Report
11.1 Descriptive Information
11.2 Test Results
Annex A Explanatory Material
Annex B Precision and Bias
Annex C Interlaboratory Application
Annex D Determination of Mass Optical Density
Annex E Informational References
Index

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