Smoke Detectors
smoke detectors — pre-owned
Browse 1,021 smoke detectors — pre-owned on eBay — listings updated every few minutes. All items are pre-owned and sold by eBay sellers directly.

Silent Knight SD505-APS (Hochicki) Smoke Detector With Base. In Working Order
I removed these smoke detectors from a fully functional system, I disassembled and cleaned the chamber of any dust, Note; Silent knight no longer makes these devices and if you have these type smokes in your building, you cannot replace with the new SK-Photo devices as your system used the SD portfolio and the new smokes use the SK portfolio (you cannot mix sk & sd devices on your panel I also have the SD500-PS & SD500-PSA pull boxes available as well Thanks for looking

SILENT KNIGHT SD505-ADH Duct Detector(w/SD505-APS Smoke Head) EXELENT CONDITION
In Exelent Conditions. The Silent Knight SD505-ADH Duct Smoke Detector including is used for detecting smoke and products of combustion present in air moving through an HVAC air handling system. The smoke chamber of the smoke detector was cleaned and blown out.

SILENT KNIGHT SD505-AIS : Ionization Smoke Detector
* Devices were removed from a System working , ( in a Commercial/Office Building ) due to a FACP Upgrade. Excellent condition : No bumps ** functional / TesTed / The Smoke Chamber was blown out and cleaned * ** The SD505-AIS is effective in detecting rapidly burning fires with little smoke The Silent Knight SD505-AIS has responsive, yet high operational stability for an extremely wide range of uses. The SD505-AIS can be used in areas where early warning of trouble from super-heated or flaming combustibles is expected.The detector features automatic compensation for contamination and a simple detector sensitivity test procedure that can be run from the panel or remotely (using theSKSS 5660 or 5670 software with a Windows TM based computer)

SILENT KNIGHT SD505-ADHR Duct Detector (built-in Relay) w/SD505-APS Smoke Head
* WITH SD505 APS Smoke Head ** Removed due to system upgrade / *** Functional / Tested All electrical parts/components on the board have been cleaned. The smoke chamber of the smoke detector was cleaned and blown out. *** The SD505-ADHR is a is a heavy-duty metal housing ; with a built-in relay module that is used to control a fan motor to stop air flow in a fire alarm situation. Silent Knight SD505-ADHR addressable duct smoke detector detects smoke and products of combustion present in air moving through an HVAC duct to prevent re-circulation of smoke into the air handling system. **** The SD505-ADHR can be powered from a 120 VAC, 240 VAC, or 24 VDC/VAC power source.

NOTIFIER FST-951 INTELLIGENT ADDRESSABLE 135° FIXED TEMP. HEAT DETECTOR "WHITE"
NOTIFIER FST-951 INTELLIGENT ADDRESSABLE 135° FIXED TEMP. HEAT DETECTOR "WHITE" FULLY FUNCTIONAL PRE-OWNED CONDITION FLASHSCAN PROTOCOL ONLY 64 AVAILABLE 1 ORDER = 1 FST-951 SEE PICTURES FOR DETAILS

System Sensor 2400 Smoke Detector Yellowed
Yellowed from the lighting.

System Sensor D4120 4-Wire Duct Smoke Detector with 2D51 Photoelectric Head
Up for sale is a complete, pre-owned System Sensor D4120 InnovairFlex 4-Wire Duct Smoke Detector Assembly paired with the matching System Sensor 2D51 Photoelectric Sensor Head.

System Sensor 4WTA-B 4W Smoke Detectors
The house we purchased had all of these detectors replaced on 10/24, so still fairly new. We upgraded our system so we don’t need these anymore. The System Sensor 4WTA-B 4W Smoke Detectors are a reliable and efficient fire protection equipment designed for commercial and industrial settings. With a trusted brand name like System Sensor, these smoke detectors are known for their quality and performance. The 4WTA-B model offers early detection of smoke to ensure the safety of the premises. It is essential for business owners and managers to prioritize fire protection equipment like these smoke detectors to safeguard their employees and property.

🤪 SYSTEM SENSOR DUCT MOUNT SMOKE DETECTOR 120 VAC D4120
SYSTEM SENSOR DUCT MOUNT SMOKE DETECTOR. LOCATED ROW 3R-2 CC. 120 VOLT AC. 24 VOLT AC/DC. WE HAVE VERY REASONABLE RATES AND YOU CAN ALWAYS SET-UP YOUR OWN FREIGHT.
You save $7.00

System Sensor 4W-B 4-Wire Photoelectric Smoke Detector with Mounting Base
Used in good condition.
You save $3.87

(1) Siemens 500-033290 / HFP-11 Smoke Detector (See Description)
WHAT YOU SEE IS WHAT YOU WILL GET.

System Sensor i3 2W-B
System sensor i3 2W-B smoke detector with base. Detectors are used but are in good working condition.

System Sensor 2W-B Photoelectric Smoke Detector
The System Sensor 2W-B Photoelectric Smoke Detector is a reliable and high-quality fire protection equipment designed for commercial and industrial use. As part of the System Sensor brand, known for its trusted products in the field of safety and security, this smoke detector provides early warning in the event of a fire, ensuring the safety of employees and property. The 2W-B model is designed to detect smoke quickly and accurately, making it a crucial component in any comprehensive fire protection system.

SILENT KNIGHT SD505-ADHR Duct Detector w/SD505-APS Smoke Head & SD505 DTS
The smoke chamber of the smoke detector was cleaned and blown out.

SIEMENS FP-11 / FP11 (USED)
The product is used surplus. Radwell is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers.
You save $291.18

Siemens ILI-1 Ionization Smoke Detectors (Lot of 5) With Bases.
The Siemens ILI-1 Ionization Smoke Detectors are a set of five smoke detectors with bases. 3 bases are the DB-3S and the other 2 are the DB-X3RS relay bases, designed to provide reliable fire protection in various settings. These detectors from Siemens are known for their high-quality construction and effective ionization technology, making them a trusted choice for businesses and industrial facilities. With the model number ILI-1, these smoke detectors offer peace of mind and safety for any environment requiring efficient fire protection equipment.

System Sensor Innovair DNR Duct Detector
Cleaned & tested, fully functional. May have signs of wear that do not inhibit function.
You save $18.18

PYROTRONICS (CERBERUS) D1-2D SMOKE DETECTOR WITH BASE
DI-2D smoke and base used

Notifier by Honeywell FSP-951-IV Smoke Detector Smoke Detectors MPN FSP-951-IV
Notifier by Honeywell FSP-951-IV Smoke Detector Smoke Detectors MPN FSP-951-IV

Siemens Cerberus Pyrotronics ILI-1 Smoke Detector (USED, GREAT CONDITION)
Siemens Cerberus Pyrotronics ILI-1 Smoke Detector. Used, untested, but in great condition.

Siemens FP-11 Fire Safety Smoke Detector Head White MPN FP-11, Smoke Detectors
Siemens FP-11 Fire Safety Smoke Detector Head White MPN FP-11, Smoke Detectors

System Sensor DH100ACDCLP Smoke Duct Detector
They have been cleaned and tested. Price is for 1 Duct Detector

Bosch F220-PTH Photoelectric Smoke Detector With Heat Detector And Base
See photos: the detector head was tested and found to be operational.

Silent Knight SK-PHOTO-W Low-Profile Addressable Detector, White EUC! Loc 126
With a sleek white design, this detector is perfect for maintaining safety in large facilities with a low profile.

System Sensor 4WTR-B Photoelectric i3 Series Smoke Detector, 4-Wire Thermal Used
Used, fully working when removed to install addressable system. Listing is for 1 smoke per purchase.

System Sensor 5451 Heat Detector Fix 135° F + Rate-Of-Rise Fire Alarm

White Industrial Smoke Detector Sensor Head, Smoke Detectors
White Industrial Smoke Detector Sensor Head, Smoke Detectors

Firex ICCA 2650-760 Duct Smoke Detector Smoke Alarm Ionization Detector
Firex ICCA 2650-760 Duct Smoke Detector Smoke Alarm Ionization Detector Great condition as shown in photos Check out my store for more FireX Thank you and Happy Bidding!

System Sensor 2400 Smoke Detector-Lot of 17
Lot of 17 system sensor model no 2400 smoke detectors. All tested and working. Shoot me an offer

Silent Knight by Honeywell Analog Photoelectric Smoke Sensor SD505-APS
Price is for (1) SD505-APS smoke detector. Smoke detectors came from a memory care facility that upgraded due to expansion. System was functional, normal, and had just passed annual inspection before removal

Pack of 18 pcs Apollo series optical smoke detector 55000-650APO
Used but in very good condition. Pack of 18 units.

Honeywell Photoelectric Smoke Detector Head w/ Base, Model/MPN TC906A1002
Sold as is! Working when uninstalled. Comes with the base.

SYSTEM SENSOR 2151 CONVENTIONAL PHOTOELECTRIC SMOKE DETECTOR W/B110LP BASE
SYSTEM SENSOR 2151 CONVENTIONAL PHOTOELECTRIC SMOKE DETECTOR W/B110LP BASE. Condition is Used. Shipped with USPS Ground Advantage.

Honeywell HFS-P Tested And Guaranteed
Removed from working system. All detectors have been cleaned and tested. The heads are paired with an A3509-000 base.

White Industrial Smoke Detector Sensor Head, Smoke Detectors
White Industrial Smoke Detector Sensor Head, Smoke Detectors
You save $0.51

GE Security Smoke Detector Four-wire ESL 500 Series 541CXT Working
GE Security Smoke Detector Four-wire ESL 500 Series 541CXT Working This came out of a working system from what I was told. I have a couple different models that I listed. I’ve sold a few and had no problems. Please review all photos before purchasing. Shipping is free with tracking. Good luck Bin# 21

Siemens FPT-11 Heat Detector Head MPN FPT-11, Heat Detectors
Siemens FPT-11 Heat Detector Head MPN FPT-11, Heat Detectors

OSID OSI-R Reflective Imaging Beam Smoke Detector Conventional ^
Pre-owned. Never installed. Light scratches in areas from being stored. Includes: Smoke detector, front cover, rear cover, and reflector. Detection Range: 16.4 ft to 328 ft (5 m to 100 m) Operating Voltage: 10.2 to 32 VDC (Nominal 12/24 VDC) Field of View (FOV): 12° (Wide angle) Adjustment Angle: 50° Horizontal, 20° Vertical (Internal "Eyeball") Sensitivity Levels: 4 Levels: 25%, 30%, 40%, and 50% IP Rating: IP55 Temperature Range: -4°F to 131°F (-20°C to +55°C) See Photos for Details Thank you for viewing our item.

HEKATRON SMOKE DETECTOR ORM 130AY
Make: HEKATRON. Part No.: ORM 130AY.

SERIES 65A 55000-326 PHOTOELECTRIC SMOKE DETECTOR WITH BASE 5 PCS LOT
You save $17.45