BS 2740:1969
Withdrawn
Specification for simple smoke alarms and alarm metering devices
Hardcopy , PDF
English
12-31-1969
02-01-2009
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
Requirements for the construction and operation of instruments designed to give an alarm when smoke emission from a chimney exceeds a chosen Ringelmann shade.
| Committee |
EH/2/1
|
| DevelopmentNote |
Reviewed and confirmed by BSI, June, 2005. (05/2005)
|
| DocumentType |
Standard
|
| Pages |
14
|
| PublisherName |
British Standards Institution
|
| Status |
Withdrawn
|
| BS 2741:1969 | Recommendations for the construction of simple smoke viewers |
| BS 2811:1969 | Specification for smoke density indicators and recorders |
| 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 |
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