Sentry Hybrid ST-643, Instruction Manual

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Emissivity
Emissivity is the ability of an object to emit or
absorb energy. Perfect emitters have an emissivity
of 1, emitting 100% of incident energy. An object
with an emissivity of 0.8 will absorb 80% and
reflect 20% of the incident energy. Emissivity is
defined as the ratio of the energy radiated by an
object at a given temperature to the energy emitted
by a perfect radiator at the same temperature. All
values of emissivity fall between 0.0 and 1.0.
6. Maintenance
Cleaning the lens: Blow off loose particles using
clean compressed air. Gently brush remaining
debris way with a camel's hair brush. Carefully
wipe the surface with a moist cotton swab. The
wab may be moistened with water.
NOTE:
DO NOT use solvents to clean the lens.
Cleaning the housing:
Use soap and water on a damp sponge or soft
cloth.
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