INTRODUCTION / SENSORS / SENSOR PLACEMENT Page 10 / 77
SENSOR PLACEMENT
Detection area
• The detection area of the sensor must be taken into consideration (see sensor’s product
data sheet). On the one hand, the sensor should detect areas of work and movement in the
room but, on the other, also the entrance so that the light can be switched on early on. If the
detection area is insufficient, additional sensors must be planned for.
• When using HF and/or radar sensors, it must be taken into consideration that a detection
through thin walls may occur. In addition, the narrow detection area (see product data sheet)
must be taken into consideration.
Light sensor
For the functioning of the daylight control, it is important that the light sensor and/or combined
presence and light sensor be position in a suitable location.
• The light sensor should not be positioned too close to window areas but also not too far into
the depth of the room.
• The sensor should be positioned where it receives an average intensity of daylight, for example
in the middle of the room or near work spaces to which the light control will be calibrated.
• If possible, the light sensor should be positioned above a suitable area. Ideally, this area
should also be utilised as reference area for the calibration of the illuminance. If possible,
this area should feature an average reflectance value. Well suited are, for example desk
surfaces or light-grey path areas.
• It should also be taken into consideration that no items be placed underneath the sensor
that have an influence on the function of the light sensor, e.g. pallets or higher pieces of
furniture.
Sources of interference
Any positioning near the following sources of interference should be avoided:
• Ventilation systems or heat sources, e.g. Heaters or also overhead projectors
• Interference sources of light such as luminaires the indirect light share of which radiates
directly onto the sensor
• Daylight reflections, e.g. by mirrors
• Radio and/or WLAN transmitters at a distance of approx. one metre
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