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Motion in the alarm area triggers an alarm and
excitation on relay 1, motion in the pre-alarm area
triggers a pre-alarm and excitation on relay 2.

Note: not all motions occurring in the pre-alarm or
alarm area are signaled. It depends on the level of
tolerance set for animals and possible semi-static
objects.

For outdoor installations, the pre-alarm area is
especially useful for implemented security
operations (e.g.: turning on the lights, activating a
surveillance video camera) in the presence of motion
in the marginal areas of the monitored area.

The configuration of the pre-alarm area in barrier
installations is usually not very useful, except for
protection in hallways, where the pre-alarm area
could be useful for detecting the presence of an
intruder in the area that is farthest from the sensor.

Interferences

Introduction

The MSK-101 sensor is different from other
traditional motion sensors. It is important to know
what factors interfere in its correct functioning, to
properly install, configure it, and to obtain optimum
performance.

Warnings relative to precipitation

Unusually intense rain (heavy storms with
intensities exceeding 20 mm/h (0.80 in/h)) can
reduce the field of vision by up to 50%.

Hail may cause false alarms.

If exposed to precipitation, install the sensor
parallel to the usual direction of the precipitation.

Precautions

The sensor has been designed for installations on
the wall or ceiling: do not install it on moving or
vibrating objects, like poles or fences.

Hiding the sensor behind objects may impact the
sensor performance, even significantly: in these
cases checking correct functioning is completely
the responsibility of the installer.

Do not install it in the presence of large reflective
objects (e.g.: metallic objects) that could influence
correct detection.

In the presence of fluorescent tubes, tilt down the
sensor by 15°/30°, or install it at a minimum
distance of 20 m from the tube.

In the presence of other MSK-101 sensors,
maintain the minimum indicated distances, see
"How to install several sensors" on the next page.

In the presence of other MSK-101 sensors, assign
each sensor to a different channel, see "How to
configure several sensors" on the next page.

The sensors that use the same frequency (e.g.

Blind Spot Detection

devices on automobiles,

with radar at 24 GHz) interfere with proper
functioning and may cause false alarms. Do not
point the sensor directly towards a parking area.

The sensor can detect motion beyond glass,
walls, and thin floors, for example in drywall. Via
the Inxpect Security application, limit the
monitored area to only the specific area of
interest, and perform tests to prevent false
alarms.

In the presence of neon tubes, respect the
minimum sensor inclination indicated so that the
tube does not interfere with the sensor:

Sensor direction

Minimum inclination (α)*

Horizontal

- 15°

Vertical

- 30°

Note *: see "Examples of the field of vision with
horizontal sensor direction (volumetric)" on the
previous page and "Examples of the field of
vision with vertical sensor direction (barrier)" on
the previous page.

Useful information for design