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Introduction

Glass break detector «Steklo-3M» (hereinafter, the Detector):
- is intended for detecting destruction of all known kinds of construction 

glass: common, quenched, patterned, armored, multilayer and laminated 
with polymer film, glass units, as well as hollow glass blocks installed in 
structural units (openings) and/or interior elements of closed spaces;

- generates alarm messages by control relay contacts opening and 

sends it to control panel (hereinafter, the CP);

- ensures case tamper protection by «Failure» relay contacts opening;
- may be installed on the wall, pier between windows and or ceiling.

Features

The Detector:
- ensures remote monitoring of controlled glazed structures of any 

configuration in a closed area;

- provides monitoring of different types of glasses with different 

dimensions;

- assures multilevel microprocessor signal processing, functional  

self-testing and regular monitoring of acoustic channel;

- offers to user an opportunity to choose an algorithm of the Detector 

operation in accordance with situation on the secured object or with 
chosen security tactics;

- displays modes of operation of the detector and noises inside the 

protected closed area by means of LED indication (providing possibility 
of noise and alarm indication disabling); 

- operates in temperature range from minus 20 up to + 45 

0

С, DС 

power supply range 9 … 17 V.

Scope of Delivery

Each Detector unit package contains the items listed in tn Table 1.
Table 1

Name

QNT

Glass break detector «Steklo-3M»
Testing ball
Screw 3-3х30.016 
Glass break detector «Steklo-3M». Installation Guide

1 pc.

*

2 pcs.

1 copy

* – Supplied optionally

Field of Application

The Detector can be applied in offices, shops, museums, exhibition 

halls, banks, accommodation rooms,  etc.

Choosing Place of Installation

Before installing the Detector, get acquainted with the following 

requirements:

- when choosing the place of installation, the Detector detection zone 

location must be taken into account (Figure 1);

- it is recommended to install the Detector at a height not less than 

2 m (see examples of installation in Figures 4 – 8);

- during joint operation with an active ultrasonic Detector, distance 

between Detectors must be not less than 1 m;

- entire area of protected glass should be available to the Detector 

visibility zone;

- distance (L) from the detector to the farthest point of protected area 

should not exceed 6 m. If protected glass area is more than 1 m

2

 , the 

specified distance L should be lengthened up to 9 m.

- for protection of quenched, laminated, armored, multilayer or  

small-area glasses, universal operation mode (See Table 2) should be 
chosen.

GLASS BREAK 

DETECTOR

 «STEKLO-3M»

Adjustment and Testing

Set  DIP-switches    «1»,  «2»  and  «5»  in  ON  position.  Energize  the 

Detector, whereupon the red LED indicator («Alarm»

 

message indication) 

should light during 2 – 10 sec and go out, displaying that the Detector 
is turned to the standby mode.

Estimate interference conditions inside protected area. Yellow LED 

indicator lighting is an evidence of high-frequency noises presence, 
green LED lighting – of low-frequency ones. If it is possible, eliminate 
source of noises. 

Fulfill the Detector adjustment as follows:
- set DIP-switches «1» and «2» in OFF position, «6» in ON position, 

«3» and «4» in OFF position;

- suspend a steel ball 20 – 22 mm in diameter on a 30 … 35 cm 

long thread, press free end of it to the upper side of a glass structure 
(ordinary, ornamental, armored, laminated), deflect it at an angle of 
30 – 70

 (see Table 3, for hollow glass blocks – 45°). Deliver a blow, 

whereupon the Detector should generate an alarm message. If there 
is no red LED lighting after test blows (relay contact are not opening), 
the Detector sensitivity should be increased  by DIP-switches «1» and 
«2» (see Table 2);

Table 3

Glass thickness, mm

<3 

3...4

4...5

5...6

6...7

>7

Ball deflection angle for ordinary, 

armed and ornamental glass, 

0

30

35

40

45

50

55

Ball deflection angle for, 

hardened and laminated glass, 

0

45

50

55

60

65

70

- for the Detector adjustment for multilayer glass or small area of glass 

protection, it is allowed to use electronic glass break simulator during 
adjustment;

- check the correctness of the Detector adjustment with the Detector 

cover installed;

- after completing the Detector adjustment, set DIP-switch «6» to OFF 

position and choose the mode of operation by «3», «4» and «5» DIP-switches 
(see Table 2) in accordance with type of secured glass and security tactics 
accepted for the object.

Manufacturer’s Guarantees

The manufacturer guarantees conformity of the Detector to the 

Technical Specifications requirements provided the transportation, 
storage, installation and operation conditions are observed.

The guaranteed shelf life of the Detector is 63 months since the date 

of manufacture.

The guaranteed useful life is 60 months since the day of putting into 

operation within the guaranteed shelf life.

The Detectors that are found non-conforming to the Technical 

Specifications requirements shall be repaired by manufacturer, provided 
the installation and operation rules have been complied with.

Table 2

DIP-switch position

Detector Operating Mode

1

2

3

4

5

6

OFF

OFF

ON

ON

OFF

ON

OFF

ON

Sensitivity 

(detection 

range) 

adjustment

minimum

+6 dB

+14 dB

+20 dB (maximum)

OFF

ON

Universal mode

Detection of glass destruction with 

chip fallout

OFF

ON

Alarm memory 

indication

– OFF 

– ON

OFF

ON

LED indication 

control

– OFF

– ON

OFF

ON

Standby mode

Adjustment

LED indicator 

lighting green

Installation

Choose the Detector place of installation, mark out places for fastening.
Remove cover and fasten the Detector by screws.

The Detector Connection

Fulfill the Detector connection in accordance with Figures 2 or 3. 

Figure 2 – The Detector 

connection pattern with separate 

alarm and case tamper loops

Figure 3 – Detector connection 

pattern of combined alarm and 

case tamper loops

Power 

supply

+  

CP 

 AL1                AL2

   AL    

+

12V-  Tamper

Installation Guide

Power 

supply

+  

CP

Figure 1 – GB channel detection pattern

Top view

Side view

AL

   AL    

+

12V-  Tamper

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