Astra-642
Ultrasonic
Volumetric Detector
Operating Manual
Rev. 642-v2_6_en
1
The operating manual describes the operating principle, opera-
tional and maintenance conditions pertaining to ultrasonic volu-
metric detector Astra-642 (
hereinafter “detector”) (Fig.1).
The manufacturer reserves the right to introduce changes
which update and retrofit the detector without prior notice. All
such changes will be described in an updated revision of the
operating manual.
1 Function
The detector detects intrusion into a pro-
tected volume of a closed room and gene-
rates an alarm notification by opening out-
put contacts of the signaling relay.
The detector is powered by any DC
source with rated voltage of 12V and pul-
sation amplitude not exceeding 0.1V.
2 Operating Principle
2.1
The operating principle of
the ultrasonic channel (herei-
nafter referred to as the US-
channel) is based on the
Doppler Effect
– changes in
frequency
of
ultrasonic
waves emitted by the detec-
tor, when they are reflected
from a moving object.
An electric signal from the ul-
trasonic sensor is sent to a
microcontroller, which
– if sig-
nals are present in both chan-
nels and in accordance with a
present operation algorithm
–
generates the “Alarm” notifica-
tion by opening the output cir-
cuit of the optic-electronic relay.
2.2
Schematics of the detec-
tion zone are shown in Fig. 2.
Note
– The US-channel de-
tection zone depends on a
specific room: some objects
absorb or reflect ultrasound,
thus distorting the detection
zone.
3 Specifications
Technical Parameters of US-channel
Intrusion detection range, m, min................................................... 10
Confident detection area angle
in horizontal and vertical plane,
о
............................................ 90
Operating frequency, kHz ....................................................... 25
Movement speed detection range, m/s................ from 0.3 to 2.0
Recommended mounting height, m ....................................... 2.2
General Technical Parameters
Power supply voltage, V .......................................... from 8 to 15
Current consumption, mA, max .............................................. 25
Readiness time, s, max .......................................................... 20
Permissible current through relay contacts, А, max............. 0,08
Permissible voltage on relay contacts, V, max ..................... 100
Resistance of the circuit, included in the alarm loop
in standby mode, Ohm ........................................................... 16
Overall dimensions, mm, max ............................... 106.
5×72×38
Weight, kg, max ................................................................... 0.08
Operating Conditions
Temperature range,
°
С ................................. from -10 up to +50
Relative air humidity, % ...................................... up to 95 at + 35
°
С
no moisture condensation
4 Delivery Set
Ultrasonic volumetric detector Astra-642 ........................... 1 pcs.
Bracket ............................................................................... 1 pcs.
Screw
2,9х25 (or 2-3x30) ................................................... 2 pcs.
Dowel
5х25 ........................................................................ 2 pcs.
Sealing material ................................................................. 1 pcs.
User Instruction ................................................................ 1 copy.
5 Structure
Fig. 3
Structurally, the detector is a unit comprised of a base and a
removable cover.
The unit houses a printed circuit board with radio elements,
screw terminal blocks for external connections, ultrasonic
transmitter and receiver (Fig. 3).
A switch installed on the printed circuit board generates a
“Tampering” notification when the cover is detached by open-
ing the ТМР circuit (irrespective of whether or not the detector
power supply is switched on).
The following indicators are mounted on the printed circuit
board: red
– for detector status monitoring, blue – for interfe-
rence indication.
The US-channel detection range can be adjusted using the
US-channel range controller.
Fig. 1
Fig. 2
Side view
Top view
Confident detection area
Probable detection area
10m
2.2m
10m
6m
0
6m
Wire
insertion holes
Mounting
holes
Screw
terminals
Tamper
Switch
PCB
Ultrasonic
transmitter
Plugs
Jumpers
US-channel
range
controller
Indicators
Ultrasonic
transmitter
Base
Cover removed
