ASTM WK39428

    Revision of E662 - 12 Standard Test Method for Specific Optical Density of Smoke Generated by Solid Materials

    (What is a Work Item?)

    Active Standard: E662 - 19

    Developed by Subcommittee: E05.21 | Committee E05 | Contact Staff Manager



    WK39428


    Keywords

    fire; fire-test response standard; smoke; smoke chamber; smoke density; smoke obscuration; solids; specific optical density;

    Rationale

    This standard currently mandates that constant irradiance by maintained by controlling and monitoring the voltage supply to the furnace. Specifically, Section 7.1.2 says that an autotransformer or alternative control device can be used, but does not elaborate. Later in that section, it specifies that a transformer must be used to maintain the prescribed irradiance level if line voltage fluctuations exceed 2.5 (units missing). Modern smoke chambers use electronic temperature controllers which maintain a constant furnace temperature my varying the voltage to the furnace based on feedback from a furnace thermocouple. This ballot revises Section 7.1.2 to describe such a control system as an option, leaving the older transformer system in place as another option. Fig.2 would also be revised to show the optional furnace thermocouple (required if using a temperature controller). It also adds the missing units in the last sentence of the existing paragraph.

    Citing ASTM Standards
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    Work Item Status

    Date Initiated:
    10-18-2012

    Technical Contact:
    Timothy Earl

    Status:
    Approved