Before Installing; General Description; Special Applications - System Sensor BEAM1224A Installation And Maintenance Instructions Manual

Electrical
Voltage:
Maximum Ripple Voltage:
Current (24 VDC):
Current (Test Mode)
(BEAM1224SA only):
Relay Contacts:
Reset Time:
Start-up Time (after 2min. reset): 60 sec Max.
Alarm Verification Time:
Remote Output:
(Alarm & Trouble)

Before Installing

Please thoroughly read this manual and applicable sections
of System Sensor's Projected Beam Detector Application
Guide. Copies of this manual are available from System
Sensor.

General Description

System Sensor Model BEAM1224A/BEAM1224SA is a long
range p rojected b eam s moke d etector d esigned t o p rovide o pen
area protection. It is to be used with ULC-listed, separately sup-
plied power (4-wire) control panels only. The detector consists
of a transmitter/receiver unit and a reflector. Smoke entering
the area between the transmitter/receiver and reflector causes a
reduction in signal. W hen the obscuration reaches alarm thresh-
olds ( chosen a t t he t ransmitter/receiver u nit), t he d etector g ener-
ates an alarm signal. Complete blockage of the beam causes a
trouble signal. Slow changes in obscuration due to a build up of
dirt or dust on the lens of the detector are compensated for by
a m icrocontroller t hat c ontinuously m onitors t he s ignal s trength
and p eriodically u pdates t he a larm a nd t rouble t hresholds. W hen
the self-compensation circuit reaches its limit, the detector gen-
erates a trouble signal, indicating the need for service.
Three LEDs on the detector indicate the current status: a
red LED for alarm, a yellow LED for trouble, and a blinking
green LED for standby operation. The alarm signal latches
and can be reset by a momentary power interruption, by
using the remote reset input to the detector if using the
remote test/reset station model RTS451, or with the local
reset button located on the detector. The local reset button
is accessible by removing the outer paintable trim ring.
The yellow LED will blink in specific patterns to provide a
diagnostic aid when diagnosing the cause of a trouble sig-
nal. Trouble signals automatically reset upon removing the
D400-73-00
10.2 to 32 VDC (BEAM1224A)
15 to 32 VDC (BEAM1224SA)
6.0 volts (Peak-to-peak)
Note: ripple must not fall below minimum operating voltage specification
Avg. Standby:
Avg. Alarm:
Avg. Trouble:
Avg. Alignment: 28mA Max.
Peak Test:
0.5A at 30 VDC
0.3 Seconds Max.
5 sec Max.
Voltage: 15 to 32VDC
Note: Output voltage same as device input voltage.
Current: 15mA maximum
Note: Output current is limited by 2.2Kohm resistor
17mA Max.
38.5mA Max.
8.5mA Max.
500mA Max.
6mA minimum
cause of trouble. In addition to these indicators, there is a
dual digital display that reads 00 to 99. This display is used
to indicate the signal strength of the beam in alignment
mode and to indicate the sensitivity setting of the detector
in percent obscuration when setting the sensitivity of the
detector. No additional equipment is needed for alignment
of the beam.
Each detector contains one Form A (normally open) con-
tact for alarm signals and one Form B (normally closed)
contact for trouble signals. The trouble contact will open
if power is removed from the detector. Thus, an additional
EOL power supervision relay is not necessary. The trouble
contacts from all the beam detectors on one initiating cir-
cuit must be connected after the last indicating device on
the loop. This prevents a single beam detector in trouble
from disabling other initiating devices on the same loop.

Special Applications

Due to the inherent capabilities of projected type beam
detectors they are often installed in locations where spot-
type detection is impractical. Projected type beam smoke
detectors are ideally suited for environmental conditions
that might include high ceilings, dusty and dirty envi-
ronments, or environments that experience temperature
extremes. Often these conditions present special problems
for the installation of spot-type detectors and even greater
problems for their proper maintenance. Due to the inherent
flexibility of mounting locations and large coverage area of
projected type beam detectors often the conditions above
can be addressed or minimized.
Some examples of applications for beam detectors might
include freezers, aircraft hangars, cold storage warehouses,
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