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B-I INDUSTRIAL CO., LTD.
SMOKE DENSITY INDICATOR
Whilst the optical units will function correctly at temperatures up to 70°C, locations of high
ambient temperature should be avoided as far as possible so that routine maintenance and
service can be carried out whilst the plant is in operation.
3-2-5 Scanning Distance
It is recommended that the scanning distance be kept within the limits 300 mm to 5000 mm.
Where the distance between the duct walls is greater the mounting tubes may be extended
into the duct to reduce the scanning distance, Scanning distances less than 300 mm should
be avoided if possible.
3-2-6 Stratification
To ensure that the smoke or dust measured by the instrument is representative of that emitted,
the influence of dampers, bends, tees, obstructions and draught balance doors should be
considered when selecting a suitable position. Location of the units close to bends in the flue
should also be avoided as the momentum of the flue gases may deposit dust on the lenses.
3-2-7 Sunlight
SUN
The optical units should not be
installed at the flue opening to
atmosphere as ambient light may
affect the stability of readings.
RECEIVER
PROJECTOR
3-2-8 Mounting Optical Units
The diagram below indicates the method of mounting to optical units on a steel duct or
chimney. Mounting tubes are normally supplied and fitted by the steel fabricator and must
always be installed in the horizontal plane.
The mounting tubes should be fabricated from 50A, Schedule 80 pipe and special flange O.D
115 mm X I.D 50mm X 15T
BI-SM2004.doc
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