DSC AC-500 - Installation Manual
The Acuity AC-500 is a glassbreak detector designed to
provide reliable protection for residential and commercial
The AC-500 is integrated with an advanced microprocessor
based glassbreak sensor, designed to detect the sounds
produced by the shattering of framed glass. The glassbreak
detection scheme used on
AC-500 is a result of an extensive
research program, which studies the properties of glass as well
as the properties of sounds produced by the shattering of
• Omnidirectional microphone
• High level static and transient protection
• Excellent RF immunity
• Microcontroller-based digital signal processing
• Dynamic Signal Processing* provides accurate detection of
laminated, wired and tempered glass types,
while rejecting common “bell” or “ringing” type sounds
• White noise rejection mechanism
• Installer test mode for glassbreak sensor
• Alarm memory (latching LED) for glassbreak sensor
• 1 year warranty
• Input Voltage
.................................................. 9 - 14.5 V
24mA standby/32mA max.@12V
• Alarm Relay: Contact Rating
• Tamper Switch: Contact Rating
• Microphone Type
(diameter x height)
4.6" x 1.4" / 117 mm x 36 mm
Glassbreak Detector Range
* Max. Range
L x W
evel 1 Detection
Level 2 Detection
0.45x0.45m and up
12"x12"/ 0.3x0.3 m to
Do not use
0.45x0.45m and up
x12"/ 0.3x0.3 m to
Do not use
Test for false alarm immunity by creating any sounds in the
room which will likely occur when the detector is armed.
Consider the following to reduce false alarms:
Although the Acuity AC-500 is designed to be immune from
ringing, bell and white noise sounds, avoid mounting the
detector near such sources (e.g., telephones, doorbells,
alarm bells/sirens, air conditioner units, water pipes, etc.).
: Application on 24 hr loops should be avoided unless
th premises are unoccupied.
To open the case, gently twist the top cover counter-
clockwise and lift it up from the bottom cover. Use a small
screwdriver to remove the appropriate knockouts for wiring.
Mount the bottom cover using the screws supplied.
To close the case, use the locating line on the bottom cover
to align the tab on the top cover. Once the top cover is
engaged, twist the top cover clockwise to lock it in place.
Use the securing screw provided for Listed installations.
: Since no adjustment is necessary for the circuit
board, it is not recommended that the installer remove the
circuit board from the case. The microphone should
Refer to the following diagram for wiring instructions:
Contacts shown with power applied in the non-alarm state
: The unit must be connected to a Listed power supply
capable of providing 4 hours of standby power.
: After installation, the detector should be tested
annually by the installer.
• J1 Installer Test Mode
• J2 Alarm Memory
• J5 Glassbreak Detection Level*
Glassbreak range test (AFT-100)
LED latch for glassbreak
Level 2 detection with
Level 1 detection with
lower glassbreak sensitivity
high glassbreak sensitivity
For UL Installations,
Level 1 detection must be used.
• RF Immunity
(Not verified by UL/ULC)
Radiated -10V/m +80% AM (@1KHz) from 80MHz to 1GHz
Conducted -10V +80% AM (@1KHz) from 150KHz to 80MHz
• Transients @ wiring terminal: 2.4KV @ 1.2joules
• Operating temperature: 32 -122°F / 0 - 50°C
• Humidity 5 - 95% RH non-condensing
AC-500: Form 'A' alarm contact.
AC-501: Form 'A' alarm contact with tamper switch
AC-502: Form 'C' alarm contact with tamper switch
Locating the Detector
Maximum distance 'D' is limited by the range
(refer to the Glassbreak Detector Range chart)
For optimum glassbreak protection, the detector should have a
clear view of the protected glass. Curtains, blinds, and other
window coverings will absorb sound energy from the shattering
glass. In these cases, mount the detector as close as possible
to the protected glass.
: Do not mount the detector on the same wall as the
Avoid installation near noise sources, such as speakers or
other objects, which produce sounds continuously. Do not
install the detector beyond the maximum recommended range,
even if the AFT-100 shows additional range - future changes
in room acoustics could reduce that additional range.
: The AFT-100 Glassbreak Simulator will provide the
most reliable and accurate indication of the correct mounting
location for the detector. Other simulators may trip the unit, but
will not provide accurate indications.
Installation Instructions Setting up the Level of Detection (Jumper J5)
The Acuity AC-500 comes with a detection level jumper setting
(Jumper J5), which allows the selection of one of 2 levels of
detection, depending on the size and acoustics of the room in
which the detector will be installed. This feature allows better
selection of the required sensitivity, thereby improving the overall
false alarm immunity of the detector.
The detector is factory preset for level 1 detection (Jumper
J5=OFF). This is the highest sensitivity setting of the detector,
and is designed for applications requiring high sensitivity and
range, such as larger rooms, or rooms which contain a significant
amount of sound-absorbing surfaces (such as carpets, furniture,
For rooms which are smaller, and contain a significant amount
of hard, sound-reflective surfaces (such as kitchens, bathrooms,
entrance vestibules, etc.), level 2 detection (Jumper J5=ON)
provides a lower sensitivity setting which is more appropriate
for these environments.
For most applications, the default setting of level 1 detection
(Jumper J5=OFF) will be the best choice.
: Upon installation, the unit should be
thoroughly tested to ensure proper working order.
1. Set the test mode jumper J1 to the ON position. The alarm
relay will latch into the alarm state, and will remain so until the
jumper J1 is restored to the OFF position after testing.
: The detector will not respond to the glassbreak
simulator unless the test mode jumper J1 is in the ON
2. If Alarm Memory operation is desired (latching LED), set
jumper J2 to the ON position.
: The Alarm Memory indication is cleared by
disconnecting the supply voltage for at least one second.
3. Close the top cover.
4. Set the AFT-100 Glassbreak Simulator to generate
appropriate glassbreaking sound; use the plate glass setting
if the glass type is unknown. To manually generate the sound,
press the Single end of the rocker switch. For automatic or
continuous operation, press the Continuous end of the rocker
switch. The AFT-100 will generate the sound once every 10
5. Hold the tester near the surface of the glass to be protected
and aim it towards the detector.
6. The correct mounting location is indicated when the device
detects glassbreaking three successive times. If the detector
does not respond each time, relocate the detector and repeat
: If the windows in question are covered by drapes or
blinds, place the tester behind the closed window coverings.
Digital Security Controls Ltd. warrants that for a period of 12
the date of purchase, the product shall be free of defects in materials and
workmanship under normal use and that in fulfilment of any breach of such
warranty, Digital Security Controls Ltd. shall, at its option, repair or
replace the defective equipment upon return of the equipment to its repair
depot. This warranty applies only to defects in parts and workmanship and
not to damage incurred in shipping or handling, or damage due to causes
beyond the control of Digital Security Controls Ltd. such as lightning,
excessive voltage, mechanical shock, water damage, or damage arising out
of abuse, alteration or improper application of the equipment.
The foregoing warranty shall apply only to the original buyer, and is and
shall be in lieu of any and all other warranties, whether expressed or
implied and of all other obligations or liabilities on the part of Digital
Security Controls Ltd. Digital Security Controls Ltd. neither assumes
nor authorizes any other person purporting to act on its
behalf to modify or to change this warranty, nor to assume for it any other
warranty or liability concerning this product.
In no event shall Digital Security Controls Ltd. be liable for any direct,
indirect or consequential damages, loss of anticipated profits, loss of time
or any other losses incurred by the buyer in connection with the purchase,
installation or operation or failure of this product.
Warning: Digital Security Controls Ltd. recommends that the entire system
be completely tested on a regular basis. However, despite frequent testing,
and due to, but not limited to, criminal tampering or electrical disruption, it
is possible for this product to fail to perform as expected.
Important Information: Changes or modifications not expressly approved by
Digital Security Controls Ltd. could void the user’s authority to operate this
This Class B digital apparatus meets all requirements of the Canadian
interference-causing equipment regulations.
Cet appareil numérique de la Classe B respecte toutes les exigences de
règlement sur le matériel brouilleur du Canada.
©2001 Digital Security Controls Ltd.
Technical Support: 1-800-387-3630
Printed in Canada 29005933 R001
FCC Compliance Statement
Changes or modifications not expressly approved by Digital Security
Controls Ltd. could void your authority to use this equipment.
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio com-
munications. However, there is no guarantee that interference will not occur in a particu-
lar installation. If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
• Re-orient the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/television technician for help.
The user may find the following booklet prepared by the FCC useful: “How to Identify
and Resolve Radio/Television Interference Problems”. This booklet is available from the
U.S. Government Printing Office, Washington D.C. 20402, Stock # 004-000-00345-4.