Honeywell SD/355, SD/355T, SD/355R Addressale Photoelectric - Smoke Detectors


The SD/355 and SD/355T addressable, low-profile plugin photoelectric detectors use a state-of-the-art photoelectric sensing chamber with communications to provide open area protection and are used exclusively with Fire•Lite’s  Addressable Fire Alarm Control Panels (FACPs). The SD / 355T adds thermal sensors that will alarm at a fixed temperature of 135°F (57°C). Since these detectors are addressable, they will help emergency personnel quickly locate a fire during its early stages, potentially saving precious rescue time while also reducing property damage. Two LEDs on each sensor light to provide a local, visible sensor indication. Remote LED annunciator capability is available as an optional accessory (P/N RA100Z(A)). The SD/355R is a remote test capable detector for use with D355PL or  DNR(W) duct smoke detector housings.


SLC loop:

• Two-wire loop connection.

• Unit uses base for wiring.


• Add ressable by device.

• Direct Decade entry of address: 01 – 99 with MS-9200 series, and 01 – 159 with MS-9600 series.


• Unique single-source, dual-chamber design to respond quickly and dependably to a broad range of fires.

• Sleek, low-profile design.

• Integral communications and built-in type identification.

• Built-in tamper-resistant feature.

• Removable cover and insect-resistant screen for simple field cleaning.


• With stands air velocities up to 4,000 feet-per-minute (20 m/ sec.) without triggering a false alarm.

• Factory preset at 1.5% nominal sensitivity for panel alarm threshold level.

• Visible LED “blinks” when the unit is addressed (communicating with the fire panel) and latches on in alarm.


• Sealed against back pressure.

• Direct surface mounting or electrical box mounting.

• Mounts to: 3.5" (8.89 cm) octagonal box, or 4.0" square electrical box (using 3.0" mud ring). 

Other system features:

• Fully coated circuit boards and superior RF/transient protection.

• 94 - V0 plastic flammability rating.

• Low standby current.


• Remote LED output connection (P/N RA100Z).


Use photoelectric detectors in life-safety applications to provide a broad range of fire-sensing capability, especially where smoldering fires are anticipated. Ionization detectors are often better than photoelectric detectors at sensing fast, flaming fires.


 These detectors are constructed of off-white LEXAN®. SD/355(T) plug-in, low-profile smoke detectors are designed to commercial standards and offer an attractive appearance.


 SD/355(T) plug-in detectors use a detachable mounting base to simplify installation, service and maintenance. Mount base on box which is at least 1.5 inches (3.81 cm) deep. Suitable boxes include:

• 4.0" (10.16cm) square box with mud ring.

• 3.5" (8.89 cm) octagonal box.

NOTE: Because of the inherent supervision provided by the SLC loop, end-of-line resistors are not required. Wiring “T-taps” or branches are permitted for Style 4 (Class B) wiring.  SD/355R mounts in a D355PL or DNR(W) duct detector housing.


Each SD355/T/R uses one of 99 possible addresses on the MS-9200 series and up to 318 (159 on each loop) on the MS9600 series Signaling Line Circuit (SLC). It responds to regular polls from the system and reports its type and status.

The SD355/T/R addressable photoelectric sensor’s unique unipolar chamber responds quickly and uniformly to a broad range of smoke conditions and can withstand wind gusts up to 4,000 feet-per-minute (20 m/sec.) without sending an alarm level signal. Because of its unipolar chamber, the SD355/T/R is approximately two times more responsive than most photoelectric sensors. This makes it a more stable detector.

Detector Sensitivity Test

Each detector can have its sensitivity tested (required per NFPA 72, Chapter 14 on Inspection, Testing and Maintenance) when installed/connected to a MS-9200 series or MS-9600 series addressable fire alarm control panel. The results of the sensitivity test can be printed off the MS-9200 series or MS9600 series for record keeping.


RA/100Z: Remote LED annunciator. 3 – 32 VDC. Mounts to a U.S. single-gang electrical box. For use with B501 and B350LP bases only.
SMK/400E: Surface mounting kit provides for entry of surface wiring conduit. For use with B501 base only.
RMK/400: Recessed mounting kit. For use with B501 base only.
M02-04-00:Test magnet.
M02-09-00: Test magnet with telescoping handle.
XR2B: Detector removal tool. Allows installation and/or removal of detector heads from bases in high ceiling applications.
XP-4: Extension pole for XR2B. Comes in three 5-foot (1.524 m) sections.
T55-127-010:Detector removal tool without pole.
BCK-200B: Black detector covers, box of 10.  WCK-200B: White detector covers, box of 10.

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 Voltage range 15 – 32 VDC (peak)
 Standby current 300 A @ 24 VDC
 Diameter 6.1" (15.5 cm) installed in B350LP base
 Height 2.1" (5.33 cm) installed in B350LP base
 Weight 3.6 oz. (102 g)
 Operating temperature range for SD/355: 0°C to 49°C (32°F to 120°F)
 for SD/355T: 0°C to 38°C (32°F to 100°F)
 For SD/355R:  installed in a DNR(W) -20°C to 70°C (-4°F to 158°F)
 Temperature 0°C – 49°C (32°F – 120°F)
 Relative humidity 10% – 93%, non-condensing
 LED current 6.5 mA @ 24 VDC (latched “ON”)
 Air velocity  4,000 ft./min. (20 m/sec.) maximum


 Listings and approvals below apply to the SD355 and SD355T detectors. In some cases, certain modules may not be listed by certain approval agencies, or listing may be in process. Consult factory for latest listing status. UL S1059.



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