Gewiss 20 Serie Manual De Usario página 14

3. INSTALLATION
The installation of the sensor must comply with a number of rules to avoid a decrease in performance due to
placement errors, in fact it is vital to accurately define the operative area of the receiver system within which the
sensor is installed, the actual range of the sensors and the correct installation paying particular attention to the
type of materials used to build the premises. The drawings below show correct and incorrect installation positions,
objects that can decrease RF signals and the obstruction caused by some building materials.
Installation situations.
RIGHT
FIX THE GW 20 470 (RECEIVER) IN A
CENTRAL POSITION IN RELATION TO
THE ROOMS TO BE SURVEILLED.
CONTROL UNIT
GW 20 470
(RECEIVER)
BASEMENT
RIGHT
FIX THE GW 20 470 CONTROL UNIT
IN THE HIGHEST POSITION COMPA-
RED TO THE GROUND
Disturbed operating situations for the sensor.
FIREPLACES
WINDOWS WITH
DRAUGHTS
WARNING: If the casing is not closed properly, there will be a malfunction in the Tamper
circuit which will activate a tamper alarm during each surveillance transmission.
The tamper code is queued to each sensor transmission, it is therefore possible, for
instance, that the alarm will be activated during the day, not due to a movement recorded
by the sensor, ignored when the control unit is disarmed, but due to the tamper signal
queued to the burglar alarm transmission made.
WRONG!!!
THE TRANSMITTERS ON THE OPPOSITE
SIDE OF THE HOUSE MAY BE TOO FAR
AWAY
CONTROL UNIT
GW 20 470
(RECEIVER)
BASEMENT
WRONG!!!
FIXING THE GW 20 470 CONTROL UNIT
BELOW ROUND LEVEL WILL CAUSE A
MARKED DECREASE OF THE SIGNAL
HEAT CONVECTOR
RADIATOR PANELS
FRIDGES OR WHITE
GOODS THAT
PRODUCE HOT AIR
Decrease of the radio signal caused by certain types of building
materials.
90% - 100%
OF FULL
CAPACITY
WALLS IN BRICK OR
PLYWOOD PERFORATED
OR HOLLOW
PANELLING
Objects that can modify/decrease the range capacity.
14
65% - 95% 10% - 70%
OF FULL OF FULL
CAPACITY CAPACITY
REINFORCED
CONCRETE
BLOCKS OR METAL
SHEETS AND
PLASTERING
METAL GRIDS (E.G. AIR
VENTS) AND REINFOR-
CED CONCRETE WALLS
METAL DOORS
MIRRORS
GW 20 477