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The JA-185B mini-size wireless glass-break detector
The JA-185B is a component of Jablotron’s alarm system. The glassbreak detector uses the analysis of air pressure variations combined with
the characteristic sound of glass breaking and it is designed for indoor use
in buildings or in cars. The battery-powered detector communicates via
Jablotron radio protocol.
protection. A visible deformation of the glass should occur but
without any damage.
x The deformation of glass causes a change in the air pressure of the
room which makes the LED on the detector flash quickly.
x Sensitivity to air pressure changes can be adjusted by a
potentiometer on the PCB. Turning clockwise increases sensitivity.
Avoid selecting too high a sensitivity as this can cause a short
battery lifetime.
x The complete function of the detector can be tested with a GBT-212
glass-break simulator. After knocking the glass, this simulator will
automatically generate the characteristic sound of breaking glass to
create the conditions for detector trig ger ing.
x If there are any devices in the detector’s protected area generating
sound such as air conditioning, heating, fax machines, refrigerators,
etc., check that they are not triggering alarms by emitting sounds
like breaking glass.
Battery replacement
The detector battery is regularly checked. If the battery has expired,
then the user or installer is informed. The detector continues to work and
each air pressure change is shown by a brief LED flash. The battery
should be replaced within two weeks by a qualified technician.
After battery replacement, the detector needs two minutes to stabilise
Installation
Installation shall only be undertaken by technicians holding a certificate
issued by an authorized distributor. The detector can be installed on a wall
or on a ceiling. In a car it can be under a dashboard. Because of its
sensitivity to air pressure changes and sounds it should not be located
close to air conditioning or ventilation outlets. There should be no sources
of vibration or audible sounds in the protected area. There should also be
no obstacles blocking the detector’s “listening” to the protected area. Keep
the detector away from metal objects which could interfere with radio
communication.
Warning: The most frequent cause of false alarms is bad detectorpositioning.
Do not set (arm) this detector if there are any people or pets moving
within the protected area.
1. Release the detector installation bracket (by turning it clockwise)
2. Attach the bracket to the desired place and reinstall the detector
onto the bracket.
3. Open the detector cover by pressing the tab
4. Remove the internal board held by an internal tab.
5. Set the detector DIP switches (see the “DIP switches” section
below)
6. Return the board into the plastic cover.
7. Leave the battery disconnected and the det ector open and then
follow the receiver (or control panel or car alarm) manual. The
detector enrolls by connecting up its battery while the receiver is in
enrollment mode.
8. After detector enrollment, close its cover, wait until its indicator
turns off and then test its functionality and adjust its sensitivity.
To enroll a detector after having already connected the battery, first
disconnect the battery, wait 30 seconds and reco nn ec t it.
The detector can also be installed without the rear holder. In this case
remove the magnet from the holder (push it out using a thin tool) and push
it into a prefabricated hole in the detector’s rear plastic cover.
DIP switches
#
1* Radio comms. supervision off Radio comms. supervision on
2** Delayed natural reaction Instant natural reaction
* Radio communication supervision should be switched off if a
detector installed in a car is enrolled to an Jablotron control panel in
a house (to avoid lost detector indication when the car drives away).
** This DIP switch has an effect if the detector is used with a CA car
alarm or with an Jablotron control panel which has a natural reaction
assigned to the JA-185B’s address. It has no effect when used with
a JA-182N or JA-180N receiver.
OFF ON
Testing the detector
15 minutes after closing the detector cover, the LED shows detector
triggering as follows:
Short flash = air pressure change (glass deformation)
Long flash = glass-break detection (alarm)
Adjusting the sensor:
x Using a suitable tool or a hand protected by gloves, one by one,
knock all the windows that should be under the detector’s
The JA-185B mini-size wireless glass-break detector 1 / 1 MHP24100
during which the LED is permanently lit. After battery replacement, test
the functioning of the detector. An expired battery should not be thrown
into the garbage, but disposed of according to local regulations.
Detection characteristics of the sensor
The directional response of the glass-break sensor has a nearspherical characteris ti c and i t is po ss i ble to de te ct br ea k ing gla ss up to 9
metres away as can be seen in the below diagram. The size of glass
should be at least 60 by 60 cm. For smaller sizes the detection range
can be shorter. Only breaking glass forming part of the walls within the
protected area can be detected. All kinds of glass can be protected
including windows covered with unbreakable folio.
Warning: Thi s type of detector is not suited to sensing h oles being cut
through glass by glass cutters. For this reason, valuables near windows
should be covered by PIR sensors.
Detector relative directional sensitivity
Technical specifications
Voltage Lithium battery type LS(T)14500 (3.6V AA / 2.4 Ah)
Calculated battery lifetime approx. 3 years (sleep time 5 min.)
Communication band: 868.1 MHz, Jablotron protocol
Communication range: approx. 100m (open area)
Detection range: up to 9 m
Operational environment according to EN 50131-1 II. internal space
Operational temperature range -10 to +40 °C
EN 50131-1, CLC/TS 50131-2-7-1, EN 50131-5-3 classification: grade 2
Dimensions, weight 88 x 46 x 22 mm, 60 g
Complies with ETSI EN 300220, EN 50130-4, EN 55022,EN 60950-1
Can be operated according to ERC REC 70-03
JABLOTRON ALARMS a.s. hereby declares that the
JA-185B is in compliance with the essential requirements and
other relevant provisions of Directive 99/5/EC
The original of the conformity assessment can be found on
the web site www.jablotron.com
Note: Although this product does not contain any harmful
materials we suggest you return the product to the dealer or
directly to the manufacturer after use.
, Technical Support section.
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