Skip to content
Please enter a keyword to search

  • BS 2740:1969

    Withdrawn A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

    Specification for simple smoke alarms and alarm metering devices

    Available format(s):  Hardcopy, PDF

    Withdrawn date:  01-02-2009

    Language(s):  English

    Published date:  31-12-1969

    Publisher:  British Standards Institution

    Add To Cart

    Table of Contents - (Show below) - (Hide below)

    Cooperating organizations
    Foreword
    Specification
    1. General
    1.1 Scope
    1.2 Definitions
    2. Simple smoke alarms
    2.1 Description
    2.2 Light beam length
    2.3 Aperture in flue
    2.4 Length of cable between photocell receiver and
          photocell amplifier
    2.5 Calibration
    2.6 Checking the alarm setting
    2.7 Alarm suppression device
    2.8 Alarm relay differential
    2.9 Relay contact loading
    2.10 Temperatures
    2.11 Weatherproofing and cleaning
    2.12 Wiring
    2.13 Supply voltage variation
    2.14 Instrument variation
    2.15 External alarm
    2.16 Failure of components
    2.17 Marking
    3. Alarm metering devices
    3.1 Alarm counter and clock
    3.2 Alarm recorder
    Appendices
    A. Guidance on the installation of smoke alarms
    B. Guidance on setting the alarm point
    C. Calibration check

    Abstract - (Show below) - (Hide below)

    Requirements for the construction and operation of instruments designed to give an alarm when smoke emission from a chimney exceeds a chosen Ringelmann shade.

    General Product Information - (Show below) - (Hide below)

    Committee EH/2/1
    Development Note Reviewed and confirmed by BSI, June, 2005. (05/2005)
    Document Type Standard
    Publisher British Standards Institution
    Status Withdrawn

    Standards Referenced By This Book - (Show below) - (Hide below)

    BS 2741:1969 Recommendations for the construction of simple smoke viewers
    BS 2811:1969 Specification for smoke density indicators and recorders

    Standards Referencing This Book - (Show below) - (Hide below)

    BS 2742:Addendum No. 1:1972 Notes of the use of Ringelmann and miniature smoke charts. The calibration of instruments in Ringelmann number
    BS 2741:1969 Recommendations for the construction of simple smoke viewers
    View more information

    • Access your standards online with a subscription

      Features

      • Simple online access to standards, technical information and regulations
      • Critical updates of standards and customisable alerts and notifications
      • Multi - user online standards collection: secure, flexibile and cost effective