Gira 5110 00 Product Documentation page 45

i With KNX RF push-button sensors, only vertical mounting of the device on walls or objects
ensures the alignment of the internal antenna. If all the push-button sensors are mounted in
the same way, then, in consequence, all their antennas are aligned to one another.
Influence of KNX RF on the human body
For many decades, radio waves have been used intensively for radio and global
communication. In particular, the new communication media for wireless telephony (UMTS,
LTE, DECT) and network communication (Wi-Fi, Bluetooth) are now being used widely in
homes and in industry. However, other electrical devices radiate electromagnetic waves, e.g.
microwave ovens.
The use of radio waves is regulated by the state. The assignment of frequency ranges and the
specification of limit values ensure that there are no health impacts for people and different
radio services do not influence one another. In particular, with regard to the number of electrical
applications, wireless computer networks, mobile radio telephones and radio services, it must
be established that the radio load of multiple KNX RF installations in parallel remains negligible.
Selecting installation location
If possible, the mounting locations of KNX RF devices must be evaluated during the planning of
the electrical installation. Concrete ceilings with metal reinforcements attenuate radio radiation
to a greater extent than wooden ceilings. The same applies for mineral plasters or hollow walls
on the basis of a metallic stand. Room use should also - if known - be taken into account,
because a living room in an existing building offers fewer obstacles to radio radiation than an
office with metallic cabinets.
A KNX RF media coupler should ideally be positioned in the centre of an RF installation
(domain) to allow low-loss and thus interference-free communication with all the corresponding
RF devices. The housing of the media coupler is compact, meaning that it can be installed
simply in standard flush-mounted appliance boxes (ideally in cavity walls) or surface-mounted
appliance boxes (e.g. in suspended ceiling constructions).
General rules on the mounting of KNX RF devices (transmitters, receivers and media couplers).
- Avoid shadows, reflections, extinguishing of radio signals as far as possible. For this, note
the structural conditions (supporting metallic parts, metal reinforcements, metallic wall and
ceiling panelling, metal-coated panes of glass / heat protection glazing).
- Do not mount the transmitter and receiver near the earth or ground.
- Align unmoveable devices to each other as identically as possible, so that the internal
transmission and reception antennas are polarised identically.
- Position the antenna of the media couplers so that they are as straight (stretched out,
unkinked) or as circular as possible in the box.
- Ensure a distance to larger metallic surfaces, e.g. doors, frames, aluminium shutters,
ceiling panelling, distribution cabinets, insulating films, ventilation grilles, is maintained.
- Ensure the penetrations of walls and ceilings are as short as possible.
- Do not place KNX RF devices in small metallic distributors or appliance boxes.
- Maintain a distance to electromagnetic interference, e.g. electronic ballasts, motors, Tronic
transformers, microwaves.
- Maintain a distance to other radio sources, e.g. wireless telephones, radio headphones,
WiFi routers.
i During mounting, particularly of media couplers, ensure that the devices are accessible
after this.
Order No. 5110 00
Software "Media coupler / repeater"
Parameters
Page 45 of 57