General Information - Gewiss 20 Serie Bedienungsanleitung

1. GENERAL INFORMATION

The passive infrared sensor GW 20 477 is an independent device which is capable of detecting the
presence of infrared energy generated by the movement of a person within the area controlled by the sensor.
The alarm, tamper and surveillance alarms statuses enable the transmission, the low battery status is
automatically queued to the first useful transmission.
The radio signal is coded and only compatible with the GW 20 470 and GW 20 481 control units; it is
powered by a standard supplied 3.6V 1.2Ah lithium battery (Lithium – Thionyl Chloride), that guarantees an
autonomy of years of activity, see the specification table, the operative range is 100 metres in open field.
To identify the remote device, a digital code is transmitted using the frequency foreseen for low power
devices (LPD). The code is generated when the device is installed, a valid random code using a 34 billion
combination system is transmitted; a reception collision-proof procedure is activated to increase the level of
security on the system.
The sensor incorporates the following functions: A sophisticated alarm generation circuit with coded radio
transmission, LED display, an integration system (with option of two or four impulses in 5 seconds) to eliminate
any alarms caused by puntiform and sudden overheating. GW 20 477 is fitted with a 5 minute inhibition timer,
between one alarm and another, to protect the battery charge used in the case of continuous movement in
the protected area. The internal battery is constantly monitored to detect its charge status and any
malfunction signal will be queued and transmitted with the next useful transmission.
A time which can be programmed and excluded is activated to transmit surveillance to the reception device,
and the incorporated indicator LEDs (which can be excluded) signal the operating status of the sensor.
It is recommended to follow the basic installation instructions for infrared detectors provided in this manual.
2. CHARACTERISTICS
Model: GW 20477
Protection rating: IP3X
Level of Performance: CEI 79-2 Level I, CEI 79-16 Level B
Power supply: 3.6V 1.2Ah lithium battery
(Lithium – Thionyl Chloride)
Min. voltage: 2,6V
Low battery voltage: 3V (reinstatement 3.1V)
Absorptions @ 3,6V: 16 μA when idle,
11 mA at TX peak.
Front LED indicators: Walk-test, alarm and low battery.
Dip switch for: Tamper enabling/exclusion, WALK-TEST,
indicator pilot lights, alarm impulse integration.
Alarm integration: Select 2 or 4 impulses in an 8 second
time window.
Capacity, coverage, See the diagrams
sensitive areas: for the lens provided.
Timer: 5 minute pause after an alarm, in
WALK-TEST 30s pause between two
successive alarms during function tests.
Max WALK-TEST time 10 minutes.
Sensor inhibition: 1 minute delay when first switched on.
Tamper: Protection against opening and removal
of the case.
Coding: Factory set transmission code Valid code
with 2 billion combinations.
TX for surveillance: 30 minute interval between two surveillance
transmissions which can not be modified.
TX Frequency: Digital transmission on a LPD frequency.
Range: 100 metres in free-field conditions.
Autonomy: 3 years with a ER14250 battery.
NOTA: With indicators enabled the autonomy is
reduced by at least 15%, the flat battery
signal is generated at 2/3 of the sensor's
autonomy.
Running temperature: from -10°C to + 45°C - 93 % Ru.
Size, weight: L 64 x H 110 x P 48 mm,
P 95 if installed with joint.
100 grams without battery.
Equipment: Screws and dowels, battery,
instruction manual.
Standard supplied jointed bracket.
The GW 20477 sensor is an accessory for compatible devices with EC
markings; it complies to ETSI-300 220 Directive, to 89/336/CEE
Standards relative to electromagnetic compatibility and to the 93/68/CEE
Standard regarding low voltage safety.
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GW 20 477