Visonic GLASSTECH User Manual

GLASSTECH

Glass Break Detector

1. INTRODUCTION

1. INTRODUCTION

1. INTRODUCTION1. INTRODUCTION

The GlassTech is a revolutionary, microprocessor-controlled
glass-break detector using original sound image recognition
methods that differ from those used by other glass break
detectors. Sophisticated techniques are applied in the GlassTech
for reliable distinction between the sound pattern created when
breaking glass framed in an outer wall, and the sound patterns
created when breaking unframed glass, bottles, plates, etc.

The GlassTech's remarkable qualities were achieved by
systematic analysis of the acoustic effects in the frequency, time
and amplitude domains. Diverse room reverberations were also
studied, to discover how local acoustics affected the recognition
of true as well as false alarms.

The digital signal processing carried out by the GlassTech relates
to several time phases, from the initial impact on the glass
window to the final sound of falling fragments. Sounds undergo
statistical analysis based on 18 different sound signatures. A

2. SPECIFICATIONS

2. SPECIFICATIONS

2. SPECIFICATIONS2. SPECIFICATIONS

Supply Voltage: 9 - 16 VDC
Current Consumption: 20 mA approx. (standby), 25 mA approx.

(on alarm).
Maximum Detection Range: 10 m (30 ft) radius at 170° if glass

size is 30 x 60 cm (1 x 2 ft) to 3 x 3 m (10 x 10 ft);
7m (21 ft) radius at 170° if glass size is 30 x 30 cm (1 x 1 ft) to

30 x 60 cm (1 x 2 ft).

Glass Types: Plate, tempered, wired & laminated.
Glass Size: 0.3 x 0.3 m (1 x 1 ft) to 3 x 3 m (10 x 10 ft).
Glass Thickness: Plate: 2.4 to 6.4 mm (3/32 to 1/4");

tempered: 3.2 to 6.4 mm (1/8 to 1/4 in.); laminated: 3.2 to 6.4 mm
(1/8 to 1/4 in.); wired: 6.4 mm (1/4 in.).

Room Size: Not larger than 15 x 15 m (45 x 45 ft);
Not smaller than 3 x 3 m (10 x 10 ft).

Min. Distance from Protected Glass: 1.2 m (4 ft).
Sensor Type: Electret Microphone.
Relay Output: Normally closed (fail-safe) contacts with 18Ω

resistor in series. Rating - 0.1A resistive / 30 VDC.

Alarm Duration: Relay contacts open for about 3 sec.
Alarm Indications: GREEN LED flickers in response to audio

sounds; lights steadily while in TEST mode.
RED LED - lights for 3 seconds on alarm, and latches ON if the

LATCH jumper is set to ON.

Installation Instructions

sound that does not qualify as a true alarm is not automatically
identified as a false alarm unless positively recognized as such.

The GlassTech has an alarm memory that can be enabled or
disabled with a jumper. If the alarm memory is enabled, the red
alarm LED illuminates and latches upon alarm (see para. 3.7).

An important feature of the GlassTech is that upon power up, it
automatically runs self-test diagnostic routines (see para. 4.3A),
and checks the local ambient conditions. The diagnostic self-test
is repeated periodically, to verify trouble-free operation of the
electronic circuitry. Models with the -AM suffix also run an anti­masking routine (see Para. 4.3B) at 30 minute intervals, to verify
that the microphone is neither masked nor damaged.

The GlassTech can take part in perimeter zone protection,
without worrying about occasional shattering of glassware, bottles
and food plates or other sounds produced by common appliances
and utensils.

Power-Up Self Test Indication: Green and red LEDs flash
alternately.

Trouble Indication: Green and red LEDs light steadily.
Trouble (TRB) Output: Open collector type, 100 mA max.
Test Period Timeout: 5 minutes.
Tamper Switch: Normally closed. Rating - 50 mA resistive / 30

VDC. Do not wire in series with the alarm relay contacts.

RFI Immunity: >30 V/m up to 1 GHz (not verified by UL).
Mounting: Surface mounting on walls and ceilings.
Optional Mounting Accessories:

BR-1: swivel bracket, adjustable 30° down and 45° left, 45° right.
BR-3: same as BR-1, with ceiling adapter.

Operating Temp.: -10°C to 50°C (14°F to 122°F).
Storage Temp.: -20°C to 60°C (-4°F to 140°F).
Dimensions (H x W x D): 68 x 51 x 23 mm (2-11/16 x 2 x 7/8 in.).
Weight: 50 gr (1-3/4 oz).
Color: White.
Patents: U.S. Patents 5,515,029 and 5,608,377.

MODELS AVAILABLE
GLASSTECH (UL-Listed): Surface-mounted model.
GLASSTECH-AM (UL-Listed): Surface mounted model with

anti- masking.
Compliance with Standards: EN 50131-1 Grade 2, Class II

3. INSTALLATION

3. INSTALLATION

3. INSTALLATION3. INSTALLATION

3.1. Mounting - General Guidelines

The GlassTech is suitable for inclusion in perimeter loops that
protect occupied and unoccupied sites.

The protected pane should measure at least 30 x 30 cm (1 x 1 ft).
Optimum results will be obtained with glass panes sized 30 x 60
cm (1 x 2 ft) to 3 x 3 m (10 x 10 ft). Glass types and thickness are
given in Section 2.

The detection range of the GlassTech is exemplified in Figure 1,
where two windows are protected by a single detector. Since
room acoustics influence the effective detection range, typical
rather than maximum ranges are shown.

Note:

For glass panes between
30 x 30 cm (1 x 1 ft) and
30 x 60 cm (1 x 2 ft), the
range is limited to 7 m. (21 ft).

Figure 1. Coverage Pattern

Window

1

DE1896- GlassTech Installation Instructions 1

170°

Window

2

GlassTech

You will obtain best detection and maximum false alarm
protection by observing the following rules:

A. Select the location carefully: Mount the GLASSTECH in the

same room with the protected glass pane, preferably on a wall
facing the glass, or on an adjoining wall or on the ceiling.

B. Do not mount the detector on the same wall as the

protected glass pane.

C. Observe room size limits: Avoid installation in rooms larger

than 15 x 15 meters (45 x 45 ft) and sites where the ceiling is
higher than 4.5 m (15 ft).

IMPORTANT: Adding detectors in a room larger than

specified will not overcome this limitation.

D. Do not install too close to the glass: Mount the detector at

least 1.2 m (4 ft) away from the protected glass, or from any
wall with glass.

E. Do not install in rooms smaller than 3 x 3 m (10 x 10 ft): It

would be impractical to install in display windows or display
cases (that have two or more flexible walls - glass, plywood,
plexiglass).

F. Keep away from noise sources: Electrical power cables, air-

conditioners, air compressors, blowing air ducts, and loud
noise sources such as powerful speakers, doors etc.

G. Avoid installation in room corners: Room corners are not

an ideal mounting location, especially if the protected glass is
smaller than 30 x 60 cm (1 x 2 ft).

H. Do not install at all in very noisy areas: Avoid small

kitchens and rooms with noisy machinery or production.
Multiple sound sources create a difficult environment for glass
break detectors.

I. Select a stable mounting surface: Brick and concrete walls

are ideal, drywall is also suitable.

J. Ensure an obstacle-free sound path: A direct line between

detector and protected glass is very important - detection
around corners cannot be guaranteed. Internal wooden
shutters in the sound path may prevent detection.

K. Never ignore sound muffling, lined or insulated drapes:

All these could adversely affect the detector's performance.

L. Beware of damp places: The unit is not sealed and may fail

to function due to excess moisture.

M. Use a swivel bracket if required: Two optional brackets are

available (see Paragraph 3.6).

Additional points to consider:
A. GlassTech is designed to detect shattering of glass framed in an

outside wall. Breaking unframed glass (bottles, plates etc.)
within the room will be identified as a false alarm.

B. GlassTech is not designed to detect the breaking of any type of

hinged glass doors. Do not use it for this purpose.

C. Despite the GlassTech's high degree of sophistication, in rare

cases and under specific conditions, certain noise bursts can
duplicate the sound image of window glass breakage.

D. The GlassTech is not intended to detect events such as glass

cracking by applying slow pressure or glass breaking by drilling
or firing bullets at the glass. Glass break detectors should be
backed up by interior detectors.

E. The GlassTech is not guaranteed to detect window breakage if

any type of plastic film is adhered to the inside surface of the
glass.

F. The GlassTech is not guaranteed to detect double-glass

window breakage.

G. Before running any wiring, we recommend to mount the detector

temporarily at the chosen location, power it up from a 9 or 12
volt battery and test the effective detection range with a glass
break sound simulator (as instructed in Para. 4.2). The test can
be repeated several times in several locations until the optimum
mounting point is determined.

C. Insert a screwdriver blade into the slot at the right side of the

PCB (see Figure 4) and dislodge the printed circuit board from
the right-side retaining tab. Remove the printed circuit board
and put it aside carefully.

3.3 Surface Mounting (GlassTech & GlassTech-AM)

The unit can be mounted directly on a flat surface or on an
optional swivel bracket (see Paragraph 3.6). Use countersunk
head screws (supplied) through the two holes in the base to
attach the base firmly to the wall or to the ceiling. Be sure to pass
the wires into the base through the wiring inlet. If the wires are
routed down from the ceiling, use the vertical wiring channel at
the rear of the base. Then carry on as directed in paragraph 3.5.

BASE

MOUNTING

HOLES

IMPORTANT! USE

SCREWS WITH

COUNTERSUNK

HEADS.

WIRING

INLET

WIRING

CHANNEL

INSERT FINGERNAIL HERE

TO REMOVE TRIM STRIP

RETAINER

TAB FOR PCB

PRINTED

CIRCUIT BOARD

FRONT COVER

TEST SWITCH

ACCESS HOLE

TRIM

STRIP

Figure 2. GlassTech - Exploded View

3.5 Mounting - Final Procedure

A. Push the detector's printed circuit board into the base, until it

snaps into place, held firmly by the retainer tabs at both sides.

B. Set the jumpers as required for the particular installation (see

Para. 3.7).

C. Complete the wiring as described in Para. 3.8.
D. Remount the front cover. Fasten it with the screw and push

the trim strip back into place.

Caution! with the-AM model, the front cover must be put

in place within 60 seconds after power up. Otherwise, the
unit will adapt itself to the "no cover" condition and a
trouble alert will result when the cover is put back (see
Section 4.3B).

3.6. Optional Mounting Brackets (Fig. 3)

Two optional mounting brackets are available:
BR-1 Surface Mounted: Swivel, surface-mounted bracket for

greater flexibility when facing the protected window. The BR-1 is
adjustable 30° downward and 45° left, 45° right.

BR-3 – Ceiling Mounted: Swivel bracket kit for easy installation
on ceilings. Consists of the BR-1 and a ceiling mounting adapter.

Note: corner

installation is not

recommended

Figure 3. Optional Swivel Mounting Brackets

3.2 Disassembling the Detector (Fig. 2)

To disassemble the detector proceed as follows:
A. Pry loose one side of the trim strip, with a fingernail or a small

screwdriver. If the trim strip doesn't come loose easily, try the
other side. Remove the trim strip and save it for later use.

B. Remove the screw that fastens the front cover to the base and

take the cover off.

2 DE1896- GlassTech Installation Instructions