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DL500 Audio glass break detector
Installation manual
Application
The DL500 audio glass break detector is used to monitor window fronts and glass
doors for glass breakage. Versatility of application is ensured by safe and reliable
detection of glass breakage occurring on objects both small and large as well as on
single or multiple glazed objects fitted with simple window glass, tempered safety
glass, laminated glass or wire-reinforced glass.
Operation
The DL500 is an intelligent audio glass break detector using the latest microprocessor
technology. The acoustic signals in the room to be monitored are recorded with a wide-
band microphone, and at a sampling rate of 20kHz.
The data are then analyzed 80 times a second to determine whether there has been an
actual breakage of framed glass. The special 3x3 signal processing algorithms are
based on the analysis of 3 different parameters (time, energy and amplitude) in 3 dif-
ferent frequency ranges (infrasound, sound and ultrasonic) and permit safe and reli-
able detection of glass breakage. Only when the signal information matches the char-
acteristics of glass breakage, the detector will trigger an alarm. The 3x3 signal proces-
sing algorithms enable the DL500 detector to automatically adjust to environments in-
volving high noise levels.
The DL500 detector features a test mode for verification of correct operation using the
GT-2 glass break simulator. A 5-minute timer serves to prevent the DL500 detector
from being inadvertently left in the test mode. A built-in power/status LED allows the
user to perform readiness tests. The DL500 detector is fitted with a latching alarm LED
(which can be disabled) for indication of a previous alarm condition. The alarm LED
can be reset either by pressing the test button or by applying a LOW signal to the reset
input.
Installation
fig. 2 to 5, 9
The DL500 may only be used for inside installation. The mounting position must be so
selected that the detector is situated on a wall or ceiling adjacent to, or across from, the
glass surface being monitored. It should not be exposed to any direct air flow. The de-
tector should have a line-of-sight view of all glass surfaces to be protected, and its dis-
tance from the furthest point of the glass must not exceed 6.5m. The distance between
the detector and the nearest glass being protected must not be less than 1.2m. The
detector must be mounted a minimum of 0.15m away from an adjacent wall or ceiling
and at a minimum height of 1.8m from the floor. Once a mounting location has been
selected, the installer may choose to temporarily mount the detector and conduct an
initial functional test.
After a suitable mounting location has been selected and the initial functional test has
been conducted, the detector must be permanently mounted, on a surface which is
stable and vibration-proof. Following mounting of the detector and its cover (fig. 9) a
final test should be conducted to verify correct operation (refer to ,Functional testing').
Fig. 2 Good ceiling mounting location / good wall mounting location.
Fig. 3 To remove the DL500 cover, loosen the screw several turns (fig. a) and lever it
against the detector base to remove it (fig. b and c).
Special notes
The detector must not be mounted on the same wall as the glass surface being pro-
tected.
In cases where the glass is covered by inside shutters or sound deadening drapes,
or where exhibits or display items conceal the detector, the detector must be
checked for correct operation before it is permanently mounted (refer to ,Functional
testing').
Do not attempt to protect glass in multiple rooms with only one detector even if the
range test indicates proper operation. This is a precaution in case doors or other
partitions are placed between rooms.
Do not operate the DL500 in 24 hour-monitoring zones.
Programmings
fig. 7
Power / Status LED green
Off
On
When closing the pins of the jumper J3, the green LED will remain lit whenever power
is present to the detector. This green LED will extinguish for one second when a loud
sound occurs in the upper frequency range, noting a pre-trip condition. While there are
many sources of sound that will turn off the green LED and note a pre-trip condition,
they will not cause the detector to activate an alarm without the presence of the other
sound characteristics required by 3x3 technology.
Alarm LED red
Flashing for 2.5s
Latched after alarm
Follows alarm relay
RESET
When an alarm occurs, the red alarm LED will flash for 2.5 seconds. If a latching LED is
desired for indication of a previous alarm, the pins on J4 are to be connected using the
jumper provided. When latched, this LED will indicate a new alarm by flashing for 2.5
seconds and re-latching afterwards. The latched LED can be reset either by applying
a LOW signal to the RESET input or by pressing the SW2 test button three times.
When a permanent LOW signal is present to the RESET input, the alarm LED will fol-
low the condition of the alarm relay.
Tamper switch
fig. 7, SW1
The DL500 detector has a built-in tamper switch (SW1) which provides a closed circuit
condition when the cover is in place. Removal of the cover causes the circuit to be
opened and a tamper condition to be created. The supplied spring must be used on the
tamper contact to assure proper operation.
01.97
Jumper J3
open
closed
Jumper J4
RESET input
open
open
closed
open
closed
permanently LOW
closed
with LOW
Functional testing
fig. 7, SW2
DL500 glass break detectors require no sensitivity adjustments, however, due to
many factors involving room acoustics, glass break detectors should be tested to en-
sure the best possible operation. Select a mounting location and remove the cover
from the detector. Apply power and press the test button (SW2) one time. Alternate
flashing of the red and green LEDs at a fast rate indicates readiness of the detector for
high frequency range testing. Replace the cover on the detector.
Position the Alarmcom GT-2 glass break simulator test unit in front of the glass at the
furthest point from the detector while aiming it toward the detector. If curtains or
shades are present, be sure they are closed and the GT-2 unit is placed between the
glass and the covering.
Slide the switch on the GT-2 to the TEST position, and a simulated glass break sound
will be produced every ten seconds. If the glass is within the range of the detector, the
flashing LEDs will latch for 2.5 seconds in response to the simulated glass break
sound from the GT-2. At the same time, the alarm relay is opened so that the appropri-
ate detection line on the alarm control unit will trip.
A second test mode is employed for testing the detector's response to the low fre-
quency range. To enter this mode while in the high frequency test mode, press the test
button (SW2) a second time. The red and green LEDs will now flash alternately at a
slower rate, indicating that the detector is ready for lower frequency range testing.
While the detector is in this mode, a sharp blow of the hand or other firm object to a
framed hollow wall, ceiling or door in the same room will cause the flashing LEDs to
latch for 2.5 seconds and the alarm relay to open. The purpose of this test is to verify
the detector's ability to respond to the lower frequency range only; it is not to be re-
garded as a range check.
The test mode has a duration of 5 minutes, after which the detector will automatically
reset to the normal operation mode. To manually exit the test mode, press the test but-
ton until the LEDs stop flashing.
Functional test with GT-2 test unit
If the detector is to be checked for correct operation while in the normal operation
mode, follow the instructions below for application of the GT-2 test unit.
1. The detector must be in the normal operation mode, with the cover in place on the
detector.
2. Hold up the GT-2 test unit directly against the glass surface to be protected while
aiming the loudspeaker opening toward the detector. Set the mode selection switch
to RUN.
3. A slap with your flat hand on the glass to be protected will cause the GT-2 unit to
automatically produce a loud simulated glass break sound.
If the detector has been correctly installed, and if there is no obstruction to visibility
between the test unit and the detector, the detector should trigger an alarm.
Caution: The GT-2 unit produces a very loud glass break sound, it must not be oper-
ated in proximity to the ears.
Specifications
Signal processing technology
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Supply voltage
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
– voltage monitoring
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Current consumption at 12V
DC
– standby, without status-LED
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
– standby, with status LED
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
– alarm condition, with alarm-LED no status LED
– standby, with latched alarm-LED and status LED
Alarm outputs
– NO relay contact
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– tamper contact
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Sensitivity
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Coverage area
– max. range
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– min. size of glass to be protected
– types of glass tested: 3.1mm standard glass
6.3mm tempered safety glass
6.3mm laminated glass
6.3mm wire-reinforced glass
Operating temperature
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Humidity (DIN class)
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DL500
Audio glass break detector
. . .
GT-2
Test unit for DL500
. . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3x3 (patent pending)
10 to 14V
< 6,4V 0.4V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
100V
30V
automatic adjustment
6.5m radius
0.3m x 0.3m
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0 C ... 50 C
F (<95% r. h.)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
p 4
or V
AC
DC
18mA
22mA
11mA
25mA
/ 500mA
DC
/ 50mA
DC
507 338
507 419
1592
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