Installation - Projector & Receiver Units; General; Typical Installation; Location - B-I Inductrial BI-SM2004 Manual

B-I INDUSTRIAL CO., LTD.
SMOKE DENSITY INDICATOR
3-2 Installation - Projector and Receiver Units

3-2-1 General

To avoid possible errors in obscuration readings due to infiltration of air the optical units
should be located away from the flame area and downstream of any flue gas sampling points.

Typical Installation

3-2-2 Location

These units must be rigidly mounted in the horizontal plane on opposite sides of the stack or
duct so that the projector light beam is at right angles to the flow of flue gases and gives
unrestricted illumination of the receiver CDS cell. The following considerations should be
taken into account when choosing a suitable location.

3-2-3 Temperature

Radiated heat, which has the greater effect on the units, can be effectively reduced by
suitable lagging of adjacent hot surfaces. Normally sufficient cooling effect is provided by air
purging. The temperature of the Projector / Receiver units should not exceed 70°C.

3-2-4 Accessibility

Optical units must be located such that they are readily accessible for lens cleaning, routine
maintenance and servicing.
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