General Information - Gewiss 20 Series Operating Instructions Manual

1. GENERAL INFORMATION

This Siren is ideal and effective when used as self-powered acoustic alarm in outdoor wireless systems, its
control module uses AM frequencies and connects to a compatible control unit, such as for instance the GW
20470 and GW 20471 models.
Its container is made from NOVODUR and is very compact; its cover has an incorporated flashing indicator with
extremely bright and highly efficient LED lights. It can be customized by applying a label with the logo of the
installation company on the space provided on the front.
It is self-powered by a Battery Pack with lithium batteries.
It is activated by coded wireless impulses (one code out of 34 billion combinations) which is transmitted from the
control unit, an emergency timer set at 1 minute blocks the activity of the siren if there is a malfunction in the control
or receiver units; it is also fitted with a self-protection device with a local alarm provided by a tamper protection
micro-switch to prevent the front cover from being opened or to prevent it from being removed from the wall.
The front flashing light is activated at the same time as the siren, nevertheless, to provide the User with more
complete information on the activity status of the wireless control unit, it also indicates as follows:
- Centrale inserita = tre lampeggi
- Centrale disinserita = accensione continua per circa tre secondi.
2. CHARACTERISTICS
Model: GW 20490
Level of Performance: II°
Protection rating: IP34
Assembly: SMD
Horn: 4 Ohm magnetodynamic model
Rated voltage: 7.2V
Minimum Running
Voltage: 4.5V
Powered by: Battery Pack with 7.2V LSH20 Lithium battery.
Absorption
in idle mode: Average 300 μA
In Alarm status: 730 mA @ 7.2V
Autonomy: 2.5 years with 4 alarm cycles per
month and 4 arming and disarming
settings per day.
Acoustic pressure: 94 dB at 3 mt @ 7,2V
Sound: Two-tone.
Arming: By digital code received
from the incorporated wireless module.
Delay in arming: 3 seconds by the control unit,
2 seconds by the opening of the Tamper.
Maximum alarm time: 1 minute – factory settings.
Stand by time: 8 seconds when first switched on
and during programme setting.
The GW 20470 and GW 20471 control units, the GW 20490 siren, the compatible sensor group and accessories
are all manufactured in compliance to the following Standards:
CEI 79-16, CEI 79-2, ETSI 300-220, ETSI 301 489, R&TTE 1999/05/CE, EN 50130-4, EN 55022,
EN 60950, 89/336/CEE, 73/23/CEE.
Siren block when
the Tamper switch
is re-closed:
Activation of the
flashing indicator:
Number of flashes:
Receiver:
Operating Frequency: European frequency for LPD devices.
Antenna:
Sensitivity:
Frames received:
Codice digitale:
Operating Capacity:
Protections:
Size:
Weight:
Running temperature: From -25 to +55 °C
Standard Fittings:
12
1 minute (during this phase it does not
acknowledge any commands).
Synchronised with the acoustic alarm,
display of the operating status of the
control unit.
Around 50 per minute
A.M. Module
High-performance ceramic antenna.
-90dB
3 frames in 9 seconds
1 codice valido su 34 miliardi di
combinazioni ad autoapprendimento.
80 metres in open field.
Siren protected against opening of
the cover and removal from the wall.
L 253 x H 290 x P 85 mm.
1.4 Kg
Screws, dowels, LSH20 battery pack,
technical manual.
GW 20490