BS 2811:1969
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.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 smoke density indicators and recorders
Hardcopy , PDF
02-01-2009
English
12-31-1969
Co-operating organizations
Foreword
Specification
1 General requirements
1.1 Scope
1.2 Definitions
1.3 Description
2 Requirements for the smoke density indicator
2.1 Light beam length
2.2 Flow of air into the flue
2.3 Length of cable between units
2.4 Protection
2.5 Cleaning and servicing
2.6 Electrical safety
2.7 Wiring
2.8 Connections for alarms and recorders
2.9 Accuracy
2.10 Instrument stability
2.11 Ranging
2.12 Supply voltage variation
2.13 Temperatures
2.14 Marking
3 Requirements for components
3.1 Indicating meter
3.2 Recorder (when fitted)
3.3 Alarm (when fitted)
Appendices
A Guidance on the installation of smoke density
indicators
B Guidance on setting the alarm point
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