Bosch D323A Specfications

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

▶

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

▶

UL Listed for commercial fire applications

www.boschsecurity.com

2 | D323A Analog Photoelectric Smoke Detector Head

USA NFPA Complies with National Fire Protection

Association NFPA 72

Installation/Configuration Notes

Compatible Products

The following products are compatible with the D323A
Analog Smoke Detector Head:

Category Product ID Product Description

Control Panels D8024 Analog FACP

D10024A Analog FACP

Detector Bases D321A Analog detector base

D336A Analog detector base

Modules D9067 Polling circuit module

Programming
Products

D5070 Analog device programmer

Modular Construction

The D323A is part of a two‑piece modular design
photoelectric smoke detector assembly. Attach the D323A
to a D321A Analog Detector Base (6 in. [15 cm]) or a D336A
Analog Detector Base (4 in. [10 cm]) by inserting the
detector head into a groove on the base and turning the
head clockwise.

The base’s security locking tab prevents any unauthorized
head removal from the base.

Mounting

Smoke detectors are typically mounted on the ceiling.
However, if smoke detectors are mounted on a wall, they
must be at least 4 in. (10 cm), but no more than 12 in.
(30.5 cm), below the ceiling.

For UL Listing requirements, the spacing between detectors
should be no more than 30 ft (9 m).

Programming

The D323A’s address is set by programming an EEPROM
microchip located in the detector head. The D5070 Analog
Device Programmer is required for address setting.

Parts Included

Quant. Component

1 Detector head

1 Dust cover

Technical Specifications

Environmental Considerations

Relative Humidity: 95% maximum, non‑condensing at +104°F

(+40°C)

Temperature (Operating): +32°F to +120°F (0°C to +49°C)

Mechanical Properties

Color: Ivory

Dimensions (diameter x D): 4 in. x 1.5 in. (10 cm x 3.8 cm)

Material: Acrylonitrile‑chlorinated polyethy-

lene‑styrene terpolymer (ACS) plastic

Weight: 3.2 oz (91 g)

Power Requirements

Current (Alarm): 8 mA

Current (Polling): 0.022 mA ± 20%

Current (Standby): 0.39 mA

Voltage (Operating): 24 VDC nominal;

17 VDC to 41 VDC range

Ordering Information

D323A Analog Photoelectric Smoke
Detector Head

An addressable device used in the analog poll­ing circuit of the Bosch Security Systems'
D8024 and D10024A Fire Alarm Control Pan­els

D323A

Americas:

Bosch Security Systems, Inc.
130 Perinton Parkway
Fairport, New York, 14450, USA
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.us

Europe, Middle East, Africa:

Bosch Security Systems B.V.
P.O. Box 80002
5600 JB Eindhoven, The Netherlands
Phone: + 31 40 2577 284
Fax: [phone]
[e-mail]
www.boschsecurity.com

Asia-Pacific:

Robert Bosch (SEA) Pte Ltd, Security Systems
11 Bishan Street 21
Singapore 573943
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.com

Represented by

© Bosch Security Systems Inc. 2010 | Data subject to change without notice
T1119598347 | Cur: en-US, V5, 4 Jul 2010