JSC FORTEZA
FORTEZA-50, 100, 200
Please visit our internet sites
:
Page 5
- influence of the radiated emission of ultra short waves of the range 150-175 MHz up
to 40 Vat on the distance 6 m maximum.
3.11
. The detector is immune to EMI: voltage impulses in supply circuits, breaks of main
supply, electrostatic discharges, and electromagnetic fields.
3.12.
Input circuits of Tx and Rx are protected from electric pickup (electric storm too).
3.13
. The detector mean lifetime is 8 years.
3.14.
Maximum dimensions of the units without a mounting kit, mm:
Tx
- 211*130*105
Rx
- 211*130*105
3.15.
Maximum weight of the units with a mounting kit, kg:
Tx
- 1,2
Rx - 1,2.
4. DETECTOR COMPONENTS
The detector delivery kit is:
1. Receiver – 1 item
2. Transmitter - 1 item
3. Mounting kit including:
-
Bracket – 2 items
-
Buckle – 4 items.
4. Kit of tools and accessories including:
-
Alarm cable
-
Key S8*10.
5. Description Manual & Service Instruction
6. Package.
5. DETECTOR STRUCTURE & OPERATION
5.1. Detector Principle of Operation
5.1.1.
The detector is a bistatic microwave detector.
The principle of the detector operation is to generate an electromagnetic field in the space between a
transmitter and a receiver. This field provides a volumetric detection zone in the form of a long
ellipsoid of rotation (see fig.3.1.). An intruder crossing a detection zone causes changes of the field.
All changes of this field are recorded. There is the detection zone configuration in fig.3.1, there are
given in table 3.1 its crosscuts dimensions for three performances of the detector dependency on the
length of a sector with the height 0, 85 m of Rx & Tx mounting.
5.1.2.
An intruder crossing a detection zone causes the change of the signal magnitude on Rx
input. The signal passes through the amplifier and is compared with the value thresholds according to
the algorithm. If the signal’s change on Rx input is provoked by a person passage, Rx generates an
alarm breaking output contact of the relay.
5.1.3
. The signal on Rx input can be changed under the influence of other factors: rain, grass,
small animals, electromagnetic interference, swinging of branches, gates entering the detection zone
commensurable with an intruder movement. Other reasons, e.g. location of extensive constructions,
objects in the detection zone or near from it like as fences, walls, irregularities, snow, grass can
influence on the level of Rx input signal. In theses cases because of big reflections and interference the
detection zone configuration jumps. Multi thresholds algorithm of the detector operation permits to
decrease the number of alarms provoked by interference.
That’s why it is necessary to observe the
recommendations in the subsection 8.1!
5.2. Adjustment, Control and Indication Parts
5.2.1.
An alarm generates the values of the Rx thresholds. An explorer establishes them during
the operation with the controller of the thresholds “MIN-MAX”. The thresholding is realized by the
main rotation of resistor axis with screwdriver. In this case the thresholds will change from minimum
(MIN) to maximum (MAX) value.
