Fire Alarm Systems | D323A Analog Photoelectric Smoke Detector Head
The D323A Analog Photoelectric Smoke Detector Head is
(FACPs).
The D323A detects dense smoke typically given off by
plastic, foam, paper, wood, and other materials that tend to
smolder. It can detect fast‑flaming fires. It uses an LED and
photodiode to measure particulate levels in its detection
chamber. These measurements are transmitted in digital
form to the control panel. The system allows for adjusting
sensitivity levels by the detector over a range of 0.05% to
4.0% obscuration. Sensitivity levels for specific detectors
can be modified on a daily schedule.
The D323A has two LEDs that flash every time the device is
polled, and latch on red when the device goes into alarm.
The unique detection chamber design prevents external
light from affecting the photodiode.
Functions
Control Panel Connection
The D323A has an eight‑bit microprocessor and
communicates with the control panel (both power and
data) over a two‑wire polling circuit. Each polling circuit can
support up to 126 analog devices. The circuit can be
configured as either a Class A or a Class B polling circuit.
Removing the D323A head from the base for service
initiates a trouble signal but does not interrupt the polling
circuit.
Contamination Testing
FACP Polling: The D8024 and D10024A FACPs are UL
Listed to monitor the contamination level of the D323A. The
FACP monitors the test condition (level of contamination)
of the detector as part of its normal polling activity. This
electrical test determines if the device is within its UL Listed
calibration range. The control panel automatically
compensates for contamination of the detector and
indicates when the device requires cleaning.
Manual: The detector can also be tested using the Bosch
Security Systems' D1000 Smoke Test Box, a UL Listed
calibrated testing device. Depending on the amount of
particulates, the rate of change, and the established
standard, the control panel can initiate an alarm or trouble
condition.
Certifications and Approvals
Region
Certification
USA
UL
UROX: Smoke - Automatic Fire Detectors
(UL268)
CSFM
7272-1615: 156
NYC-MEA
26-02-E, Vol. III
Hong Kong
HKFSD
D323A Analog Photoelectric Smoke
Detector Head
▶
Addressable analog photoelectric smoke detector
head that mounts on D321A or D336A Analog Detector
Base
▶
Advanced digital communications protocol
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Digital data communications and power provided over
two-wire circuit
▶
Easy head removal for cleaning and servicing
▶
Dual Polling Status and Latching Alarm LEDs on head
for easy viewing
▶
EEPROM addressing in detector head
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UL Listed for commercial fire applications
www.boschsecurity.com
