Application manual
KNX standard wall presence detector with movement function EK-SN2-TP-
…
Rev. 1.0
– 29/09/2022
MAEKSN2TP_EN
© Ekinex S.p.A.
– All rights reserved
Pag. 7
7
Operation
The sensor reacts to the thermal radiation emitted by moving bodies; the detection area is optically
divided in small sections through a composite lens. A person walking in the detection area across
the sections triggers the sensor.
7.1
Brightness measurement
The measurement of the room brightness is carried out by an integrated light sensor with linear
output and optical
filter set on the profile of the human eye. The brightness value, measured in Lux,
can be transmitted on the bus.
7.2
Lighting control channels
The lighting channel has two operation modes, Automatic or Semi-automatic. The automatic mode
controls both switch-on and switch-off, when a movement is detected; the semi-automatic mode
requires manual switch-on, which is maintained until movement is detected; it will swich-off only
when no more movement is detected.
The lighting source can be controlled through two different types of communication objects: On-Off
switch or Absolute dimming percentage.
In automatic mode, a load connected to a lighting channel will be switched on when movement is
detected and (if desired) the ambient light level is below a preset brightness value.
When no movement has been detected for a programmable time duration, a stand-by phase can be
entered, during which the light can be dimmed to a lower intensity; if no further movement is detected,
once stand-by time has expired, the light will be automatically switched off.
Both the light level threshold and stand-by time functions can be disabled if not required.
7.3
Constant ambient brightness regulation
The internal brightness sensor can be used to maintain a constant ambient brightness if a dimmable
light source is available. The light source must be capable of being controlled through a Relative
dimming communication object.
7.4
HVAC control channels
The HVAC channels act in a similar way as the Light Control channels, but without the standby time
and the dependence from the light level.
8
Positioning
The actual detection range of the sensors depends on the mounting height.
The optimal range is achieved walking through several portions of the detection area.
Figure 2 - Positioning
Increased
sensitivity
if
movement crosses the lens
beam
Less
sensitivity
if
the
movement is towards the lens
