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X
Y2
Figure 1. Motion detection area. H: ceiling height. Minor movement detection area: X1 by Y1. Major movement detection area: X2 by Y2.
7
Design-in Guide - EasyAir SNS210 MC
Y
Y1
Motion detector
The occupancy sensor is a PIR (Passive Infrared) sensor
that detects movement with an X-Y cross-area under an
angle of X = 62° and Y = 84°. Two types of movements
are defined as follows:
• Major movement: movement of a person walking into or
through an area.
• Minor movement: movement of a person sitting at an
office desk reaching for a telephone, turning the pages in
a book, opening a file folder, picking up a coffee cup, etc.
When installed in a typical office ceiling at height, the
sensor is sensitive to minor movements within X1 by Y1
area. It will respond to minor movements down to a few
centimeters at the task area of a desk and is sensitive
to major movements within a range of X2 by Y2. The
directions X1, X2 are parallel to direction X; likewise for Y1,
Y2 being parallel to Y. The maximum recommended height
to place the sensor in the ceiling is 3 m to assure
movement coverage and detection. The PIR sensor reacts
on movement by means of a temperature difference, such
as the human body temperature versus its surrounding
temperature e.g. people. People sitting behind a
transparent shield or glass window are not seen by PIR
sensor of SNS210. Please refer to the table below for
coverage area details.
Minor movement
Height
X1
2.4m
1.9
3.0m
2.4
X1
X2
Major movement
Y1
X2
2.9
2.9
3.6
3.6
H
Y2
4.3
5.4
August 2021
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