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Basics
The Control4 Movement Detector 220 SM is a passive infrared movement detector and detects invisible infrared
heat radiation. If the registered energy pattern changes as the result of movement, a pulse is activated. The
transmission range depends on the intensity of the infrared radiation and on the direction of movement. The
reception is influenced by weather conditions. The sophisticated electronics of the Movement Detector 220 SM
detects this and compensates for the fluctuations in the transmission range. Detection i s impaired by obstacles
such as glass or plants.
The detection principle
All warm bodies give off infrared heat radiation. The more distinctly the infrared heat radiation stands out from its
surroundings, the better the sensors used in the Movement Detector 220 SM detect this infrared heat radiation.
The Movement Detector 220 SM responds to fast and large changes in temperature. Slow changes in
temperature and constant temperatures, such as the cooling of a car engine, do not trigger a pulse. If a person
moves directly towards the sensor, the heat radiation gets slowly and constantly more intensive, and the unit does
not, therefore, activate immediately. That is why the Movement Detector 220 SM should preferably be mounted
crosswise to the direction of movement. Humidity, such as fog, can reflect the infrared radiation and reduce the
sensitivity of the sensor.
Optics
The range and the detection angle is mainly determined by the optics of a movement detector, i.e. the
arrangement and design of the sensors and of the lens used. In the Movement Detector 220 SM, it is two highly
sensitive sensors in connection with a mirror system and a lens that is optimally adapted to it which determine the
detection range of 220°. The lens and the mirror system bundle the infrared radiation striking the device and
project it onto the sensor. The sensitivity to movement within the detection range is determined mainly by the
number and optical design of the lens segments. The available range is the result of the size of the lens segments
(optical magnification) and the electrical amplification factor. The Movement Detector 220 SM also offers the
option of monitoring the frame "backwards" without loss of frontal range by mounting it directly above doors or
windows. This is especially convenient when leaving the house.
The following factors should be taken into account during the planning stage:
The installation site should be chosen in such a way that the most frequent direction of movement is
crosswise to the detection range.
A mounting height of 2.5 m ensures an optimum surveillance function and is the basic height for the technical
specifications of the transmission range.
Self-test
A further advantage of the Movement Detector 220 SM is the integrated testing function. Each time the supply
voltage is activated or the device is switched on, a complete self-test is carried out. When the Movement Detector
220 SM is fully functional, it switches itself on for confirmation for approximately one minute or for the set switch -
off delay.
The test function is not dependent on brightness. During a test of the normal operating mode the switch -off delay
is two seconds when triggered. During an active activation test function the integrated red LED flashes when
triggered.
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