7
Design-in Guide - EasyAir SNS210
MC
August
202
1
X1
X2
Y1
Y2
H
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.
Figure 1. Motion detection area. H: ceiling height. Minor movement detection area: X1 by Y1. Major movement detection area: X2 by Y2.
X
Y
Minor movement
Major movement
Height
X1
Y1
X2
Y2
2.4m
1.9
2.9
2.9
4.3
3.0m
2.4
3.6
3.6
5.4
