as a movement of a heat
source in the surveillance
zone.
2. When specifying the
mounting location and
height, take into account
the
distances
to the road
and to neighbouring
properties etc. to avoid
unwanted triggering.
3. To
optimise detection
,
install the device at an
angle to the detection
levels. A directly approach-
ing heat source is not
detected as reliably as one
moving across the detec-
tion zone. Since infrared
waves cannot penetrate
solid objects, make sure
that nothing obstructs the
line of vision of the Busch
Watchdog.
4.
Every
passive infrared
movement detector
responds to a fast change
in local heat radiation. As
all passive infrared move-
ment detectors, To prevent
inadvertent switching
operations, the Busch
Watchdog should therefore
be installed so that it is
protected from
rain, wind
and
direct sunlight
as far
as possible. The housing of
the Busch Watchdog is
adequately protected
against water spray,
allowing an outdoor
installation without addi-
tional water protection.
5. The
minimum distance
between the Busch
Watchdog and the
switched lights is 1.5 m.
The temperature change
of a light installed near the
sensor could otherwise
cause the sensor to re-
activate after it has been
switched off.
Spotlights should not be
aimed directly at the Busch
Watchdog.
6.The range to the front can
be adjusted by turning and
tilting the sensor part, and
to the side by
partially
covering
the lens with
masking strips. If parallel
inductances such as relays,
fluorescent lamps or
transformers are switched
with the Busch Watchdog,
we recommend the use of
an RC suppressor (order
no. 6899) parallel to the
load. As the Busch
Watchdog is an electronic
device, the installation of a
surge arrester parallel to
the power supply is
advisable, since parallel
inductances can cause
overvoltages in the range
of 3000 to 4.000 volts.
25
24
Installation
Installation at a
height of 2.5 m
This is the
optimum
instal-
lation height. The readings
given here (see p. 28 – 29)
were taken at an ambient
temperature of 20 °C with an
approach from the side (for
ambient conditions, see p. 18).
Installation instructions
1. The Busch Watchdog must
be mounted on a
solid wall
,
since each detector move-
ment has the same effect
2.5 m