USER MANUAL
ETHSA / ETHSU
ENOCEAN TEMPERATURE AND HUMIDITY SENSOR
© 2022 EnOcean | www.enocean.com
F-710-017, V1.0
ETHSx User Manual | April 2022 | Page 21/27
Figure: Properly inserted battery
4.4
Transmission Range
Mounting the sensor housing with his backside on metal surfaces will reduce the transmission
range. Therefore please note that a radio receiver unit should not be mounted in the same
plane as the metal surface, because in extension of the metal surface the transmission range
is reduced by physical radio transmission effects of the antenna near to metal. For example
the receiver should not be mounted at the same wall side.
The main factors that influence the system transmission range are type and location of the
antennas of the receiver and the transmitter, type of terrain and degree of obstruction of the
link path, sources of interference affecting the receiver, and “
d
ead” spots caused by signal
reflections from nearby conductive objects. Since the expected transmission range strongly
depends on this system conditions, range tests should categorically be performed before
notification of a particular range that will be attainable by a certain application. The following
figures for expected transmission range may be used as a rough guide only:
◼
Line-of-sight connections: Typically 30 m range in corridors, up to 100 m in halls
◼
Plasterboard walls / dry wood: Typically 30 m range, through max. 5 walls
◼
Ferroconcrete walls / ceilings: Typically 10 m range, through max. 1 ceiling
◼
Fire-safety walls, elevator shafts, staircases and supply areas should be considered as
screening.
The angle at which the transmitted signal hits the wall is very important. The effective wall
thickness
–
and with it the signal attenuation
–
varies according to this angle. Signals should
be transmitted as directly as possible through the wall. Wall niches should be avoided. Other
factors restricting transmission range:
◼
Switch mounted on metal surfaces (up to 30% loss of transmission range)