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A reliable infrared movement
detector offers additional
protection. It ensures that
nobody can enter its surveil-
lance zone without activating
the lights. As a result, unin-
vited guests draw attention
to themselves and can be
readily observed.
This acts as a deterrent.
A passive infrared movement
detector registers the move-
ment of a heat source and
switches on the connected
lighting. When the surveil-
lance zone is vacated, the
lighting is switched off again
after a specified delay time.
• The Busch Watchdog is a
passive infrared movement
detector. It registers invis-
ible infrared heat radiation.
• If the registered energy
pattern changes as the
result of movement, a
pulse is activated. The
strength of the pulse
depends on the intensity
of the infrared radiation
and on its direction of
movement.
Introduction
Principle of operation
• The Busch Watchdog is
purely a receiver and trans-
mits no signals itself. The
connection between the
heat source and the Busch
Watchdog is the ambient
air. Under certain
circumstances, the recep-
tion conditions are influ-
enced by the prevailing
weather conditions. As
a result of the highly
intelligent electronics,
the Busch Watchdog can
recognise this and largely
compensates for ambient
range fluctuations.
Detection through
obstacles such as glass or
vegetation is not possible.
