Detectors
Notifier: types, successors and bases
Which Notifier detectors manufactured since 2000 must be replaced, what is still available, which detector replaces older types and when a new base is needed – with order numbers from Notifier by Honeywell.
Detector age
How old is the detector – how long has it been in operation?
- Notifier: Detector label with type and date code. For OPAL detectors on loop panels, the panel displays detector data such as contamination; the commissioning date can be found in the logbook and records.
- Logbook and reports (decisive): The operating time counts from the commissioning of the detector. The date is recorded in the logbook, in the commissioning or acceptance report or in the last replacement report. This gives the years and months in operation.
- Type plate on the detector: The label (usually on the underside or side of the detector, visible after twisting it out of the base) shows the type, serial number and date of manufacture or a date code (e.g. year/calendar week). If no commissioning date is documented, we take the cautious approach of calculating from the date of manufacture.
- Reading out via the panel: With many addressable loop detectors, detector data such as serial number, date of manufacture, degree of contamination and – depending on the system and software version – operating hours can be retrieved via the panel’s operating unit or programming software. We do this during the survey using your programming file.
This determines the replacement interval under DIN 14675: as a rule 5 years, or 8 years for detectors with contamination compensation and testing in accordance with the manufacturer’s specifications – details under Deadlines & standards. Send us a photo of the type plate and we will determine the age for you.
Notifier by Honeywell
Which Notifier detector is installed at your site?
Notifier loop panels (NF 50, NF 300, NF 3000, NF 500, NF 5000, NOTIFIER INSPIRE) work with intelligent addressable loop detectors. The current range is the OPAL series (types NFXI-… with isolator and NFX-…-IV without isolator), preceded by Series 700 (SDX-751, FDX-551, IRX-751, CPX-751). Conventional panels (NFS 4, NFS 8) are fitted with detectors of Series 800 and ECO 1000. The type designation is printed on the detector label.
Images: Notifier by Honeywell, Fire Detection Catalogue 2025. Examples shown; housing colour and labelling may vary by type.
No longer available
Older Notifier detectors and their successors
Notifier discontinued the Series 700 detectors as of 01.04.2010. According to Notifier, OPAL detectors are 100% mechanically and electronically backward compatible with Series 700 – detectors and bases fit together. For older systems, OPAL detectors without isolator (…-IV) are available.
Addressable loop (Series 700 and older)
| Image | Old detector | Old type | Available? | Alternative detector | New base? |
|---|---|---|---|---|---|
| Optical smoke detector Series 700 | SDX-751EM | no – discontinued 04/2010 | NFXI-OPT (with isolator) or NFX-OPT-IV (without isolator) | no – existing base remains¹ |
| Optical smoke detector, older version | SDX-751E | no – discontinued 2002 | NFXI-OPT or NFX-OPT-IV | no – existing base remains¹ |
| Optical/thermal multi-sensor detector Series 700 | SDX-751TEM | no – discontinued 04/2010 | NFXI-SMT2 or NFX-SMT2-IV | no – existing base remains¹ |
| Multi-sensor detector, older version | IPX-751E | no – discontinued 2002 | NFXI-SMT2 or NFX-SMT2-IV | no – existing base remains¹ |
| Multi-sensor detector optical/thermal/IR (SMART3) | IRX-751TEM | no – discontinued 04/2010 | NFXI-SMT3 or NFX-SMT3-IV | no – existing base remains¹ |
| Multi-sensor detector SMART4 (smoke/heat/IR/CO), old version | IRX-751CTEM | no – discontinued 04/2010 | IRX-751CTEM-W or IRX-751CTEM-IV | no – existing base remains¹ |
 | Rate-of-rise heat detector Series 700 | FDX-551REM | no – discontinued 04/2010 | NFXI-TDIFF or NFX-TDIFF-IV | no – existing base remains¹ |
| Fixed-temperature heat detector 58 °C Series 700 | FDX-551EM | no – discontinued 04/2010 | NFXI-TFIX58 or NFX-TFIX58-IV | no – existing base remains¹ |
| Fixed-temperature heat detector 78 °C Series 700 | FDX-551HTEM | no – discontinued 04/2010 | NFXI-TFIX78 or NFX-TFIX78-IV | no – existing base remains¹ |
| Heat detectors, older versions | FDX-551RE / FDX-551E / FDX-551HTE | no – discontinued 2000 | NFXI-TDIFF / NFXI-TFIX58 / NFXI-TFIX78 | no – existing base remains¹ |
| Ionisation smoke detector (radioactive source) | CPX-751E | no – discontinued 12/2008 | SMART3 (NFXI-SMT3) or SMART4 (IRX-751CTEM-W)² | no – base remains; dispose of ionisation detector properly² |
Conventional technology (spur line)
| Image | Old detector | Old type | Available? | Alternative detector | New base? |
|---|---|---|---|---|---|
| Conventional optical smoke detector | SD-651E | no – discontinued 2005 | SD-851E A | on request |
| Conventional ionisation detector | CP-651 | no – discontinued 2005 | SD-851TE A² | on request |
| Conventional optical smoke detector | 2151E | no – discontinued 2010 | SD-851E A | on request |
| Conventional rate-of-rise heat detector | 5451E | no – discontinued 2004 | FD-851RE A | on request |
| Conventional fixed-temperature heat detector | 4451E | no – discontinued 2004 | FD-851TE A | on request |
| Conventional detector Series 800, old type number | SD-851 E / SD-851 TE / FD-851 TE / FD-851 RE / FD-851 HTE | type renamed | SD-851E A / SD-851TE A / FD-851TE A / FD-851RE A / FD-851HTE A | no – B401 remains |
| Conventional detector ECO 1000, old type number | ECO 1002 / 1003 / 1004T / 1005 / 1005T | type renamed | ECO1002 A / ECO1003 A / ECO1004T A / ECO1005 A / ECO1005T A | no – ECO1000DB remains |
¹ According to Notifier, OPAL series detectors and bases are 100% backward compatible with Series 700. Where the isolator was previously implemented in the base B524IEFT, Notifier specifies the standard base B501AP-IV with a detector with isolator (NFXI-…) as the replacement. ² Ionisation detectors contain a radioactive source and must be returned via the manufacturer or an approved disposal company. Source of the successors: Notifier discontinuation list IN-DT-035 (as of 07/2017) and 2025 catalogue.
Current series
OPAL series, self-test detectors and conventional detectors: same detector, same base
These Notifier detectors are available (2025 catalogue, as of 12/2024). With Notifier, the type designation is also the order number. When replaced on schedule, the detector is exchanged for the same type; the existing base remains.
| Image | Detectors | Item no. | Available? | Replace with | New base? |
|---|---|---|---|---|---|
| Optical smoke detector OPAL with isolator (EN 54-7/-17), pure white | NFXI-OPT | yes | same type | no – B501AP remains |
| as above, black | NFXI-OPT-BK | yes | same type | no – B501AP-BK remains |
| Multi-sensor detector OT OPAL with isolator (EN 54-5 A1R/-7/-17) | NFXI-SMT2 | yes | same type | no – B501AP remains |
| as above, black | NFXI-SMT2-BK | yes | same type | no – B501AP-BK remains |
| Multi-sensor detector OTIR (SMART3) with isolator (EN 54-5 A1R/-7/-17) | NFXI-SMT3 | yes | same type | no – B501AP remains |
| Fixed-temperature heat detector 58 °C with isolator (EN 54-5 A1S/-17) | NFXI-TFIX58 | yes | same type | no – B501AP remains |
| Fixed-temperature heat detector 78 °C with isolator (EN 54-5 BS/-17) | NFXI-TFIX78 | yes | same type | no – B501AP remains |
| Rate-of-rise heat detector with isolator (EN 54-5 A1R/-17) | NFXI-TDIFF | yes | same type | no – B501AP remains |
| as above, black | NFXI-TDIFF-BK | yes | same type | no – B501AP-BK remains |
 | High-sensitivity smoke detector VIEW (EN 54-7) | NFXI-VIEW | yes | same type | no – B501AP remains |
| Multi-sensor detector SMART4 (smoke/heat/IR/CO; EN 54-5/-7), pure white | IRX-751CTEM-W | yes | same type | no – B501AP remains |
| as above, white | IRX-751CTEM-IV | yes | same type | no – B501AP-IV remains |
| Optical smoke detector OPAL without isolator (EN 54-7), white | NFX-OPT-IV | yes | same type | no – B501AP-IV remains |
| Multi-sensor detector OT OPAL without isolator (EN 54-5/-7) | NFX-SMT2-IV | yes | same type | no – B501AP-IV remains |
| Multi-sensor detector OTIR OPAL without isolator (EN 54-5/-7), white / black | NFX-SMT3-IV / NFX-SMT3-BK | yes | same type | no – base remains |
| Fixed-temperature heat detector 58 °C without isolator (EN 54-5) | NFX-TFIX58-IV | yes | same type | no – B501AP-IV remains |
| Fixed-temperature heat detector 78 °C without isolator (EN 54-5) | NFX-TFIX78-IV | yes | same type | no – B501AP-IV remains |
| Rate-of-rise heat detector without isolator (EN 54-5) | NFX-TDIFF-IV | yes | same type | no – B501AP-IV remains |
 | Self-test smoke detector with isolator (EN 54-7/-17, VdS G 222063)³ | NFSTI-OPT | yes | same type | no – B501AP remains |
| Self-test heat detector with isolator (EN 54-5/-17, VdS G 222062)³ | NFSTI-THE | yes | same type | no – B501AP remains |
| Self-test multi-sensor detector OT with isolator (EN 54-5/-7/-17)³ | NFSTI-SMT2 | yes | same type | no – B501AP remains |
 | Optical Ex smoke detector for NF loop, zones 0, 1 and 2 (EN 54-7) | IDX-751 AE | yes | same type | on request |
| Conventional optical smoke detector Series 800 (EN 54-7) | SD-851E A | yes | same type | no – B401 remains |
| Conventional multi-sensor detector Series 800 (EN 54-5/-7) | SD-851TE A | yes | same type | no – B401 remains |
| Conventional fixed-temperature heat detector Series 800 (EN 54-5) | FD-851TE A | yes | same type | no – B401 remains |
| Conventional fixed-temperature heat detector, high temperature, Series 800 (EN 54-5) | FD-851HTE A | yes | same type | no – B401 remains |
| Conventional rate-of-rise heat detector Series 800 (EN 54-5) | FD-851RE A | yes | same type | no – B401 remains |
| Conventional optical/thermal smoke detector ECO 1000 (EN 54-5/-7) | ECO1002 A | yes | same type | no – ECO1000DB remains |
| Conventional optical smoke detector ECO 1000 (EN 54-7) | ECO1003 A | yes | same type | no – ECO1000DB remains |
| Conventional fixed-temperature heat detector ECO 1000 (EN 54-5) | ECO1004T A / ECO1005T A | yes | same type | no – ECO1000DB remains |
| Conventional rate-of-rise heat detector ECO 1000 (EN 54-5 A1R) | ECO1005 A | yes | same type | no – ECO1000DB remains |
³ According to Notifier, the self-test function only works with NOTIFIER INSPIRE panels connected to Honeywell CLSS; on other panels the detectors run in the OPAL or CLIP protocol without self-test. Current catalogue designation “A” for conventional detectors: successor to the former type numbers without “A”.
Bases
Notifier bases: when a new base is needed
OPAL detectors have the isolator in the detector, not in the base. This is why the same standard base fits all addressable loop detectors. If a B501AP is already installed, it remains during replacement.
| Image | Bases | Item no. | Suitable for | Note |
|---|---|---|---|---|
 | Standard loop base, pure white | B501AP | OPAL, Series 700, SMART4, NFSTI | remains during replacement |
| Standard loop base, black | B501AP-BK | OPAL black (…-BK) | remains during replacement |
| Standard loop base, white | B501AP-IV | OPAL …-IV, replacement for B501 | remains during replacement |
| Base with integrated isolator, pure white / white | B524IEFT-1W / B524IEFT-1 | Series 700 and OPAL | remains during replacement |
| Base with detector heater, pure white / white | B524HTR-W / B524HTR | Addressable loop detectors in unheated rooms | remains during replacement |
| Old standard base (discontinued 04/2010) | B501 | Series 700 | Replacement: B501AP-IV |
| Old base with isolator (discontinued 04/2010) | B524IEFT | Series 700 | Replacement: B501AP-IV + detector with isolator |
| Standard base for conventional detectors / deeper version | B401 / B401DG | Series 800 | remains during replacement |
| Standard base, surface/flush-mounted, for conventional detectors | ECO1000DB | ECO 1000 | remains during replacement |
| Base with relay 12 V / 24 V | ECO1000BREL12L / ECO1000BREL24L | ECO 1000, replacement for B312RL / B324RL | remains during replacement |
Base types according to the Notifier 2025 catalogue and discontinuation list IN-DT-035.
Special detectors
Notifier: wireless, Ex, ventilation duct and linear detectors
For areas without cabling, Ex zones, ventilation ducts and large halls, Notifier offers wireless, Ex, duct and linear beam detectors.
| Image | Detectors | Item no. | Available? | Replace with | Note |
|---|---|---|---|---|---|
 | Wireless scattered-light smoke detector, Agile series, battery-powered, MESH wireless (EN 54-7/-25, VdS G 217074) | NRX-OPT | yes | same type; batteries according to manufacturer’s specifications | via wireless gateway NRXI-GATE on the loop |
 | Wireless multi-criteria detector OTIR, Agile series (EN 54-5/-7/-25) | NRX-SMT3 | yes | same type | via NRXI-GATE |
| Wireless rate-of-rise heat detector, Agile series (EN 54-5/-25) | NRX-TDIFF | yes | same type | via NRXI-GATE |
 | Wireless multi-sensor smoke detector, SG series (formerly SG350) | L-MC-SG | yes | same type | via wireless transponder IDP-RM1 |
| Wireless heat detector fixed/rate-of-rise, SG series (formerly SG200) | L-HT-SG | yes | same type | via wireless transponder IDP-RM1 |
| Optical Ex smoke detector for NF loop, zones 0, 1 and 2 | IDX-751 AE | yes | same type | see table “Current series” |
 | Ventilation duct detector housing incl. base, for optical smoke detector NFXI-OPT; air inlet tubes DST1 to DST10 depending on duct width | DNRE | yes | NFXI-OPT detector in the housing | housing and tube remain |
 | Linear beam smoke detector, loop-powered, 5–70 m (up to 100 m with reflector kit BEAM-LRK) (EN 54-12) – formerly NFXI-BEAM | NFXI-BEAM-E | yes | same type | reflector and mounting kit 6500-MMK remain |
| Linear beam smoke detector, loop-powered, remote-testable (EN 54-12) – formerly NFXI-BEAM-T | NFXI-BEAM-TE | yes | same type | Remote control unit RTS151KEY |
 | Imaging linear beam smoke detector OSID, receiver 7° with light source OSE-SPW (EN 54-12) | OSI-10 / OSE-SPW | yes | same type | – |
 | Infrared flame detector (EN 54-10) | RIV-601P/F | yes | same type | Bracket SOR-876 |
Information according to the Notifier Fire Detection Catalogue 2025 (as of 12/2024). Wireless detectors: battery replacement according to manufacturer’s specifications; linear beam smoke detectors are tested according to the manufacturer’s specifications instead of being replaced at fixed intervals.
Important
Before ordering
- Check the panel: OPAL detectors run in the OPAL and the CLIP protocol and therefore also on older Notifier loop panels; the full address range (159 detectors) and the self-test require OPAL or INSPIRE respectively. We check this using your detector list and programming file.
- Replacement interval: Smoke and multi-sensor detectors after 5 years at the latest, or after 8 years with automatic contamination compensation and testing in accordance with the manufacturer’s specifications – details under Deadlines & standards.
- Change of detector series: New bases, different detector types or a changed number of detectors may constitute a significant modification – see expert inspection and fire brigade.
- EN 54 tested (as of 19.10.2026): All Notifier detectors listed as available are certified to EN 54-5 or EN 54-7 (OPAL detectors with isolator additionally to EN 54-17); CE certificate numbers according to the Notifier 2025 catalogue. The detectors that are no longer available were approved under the EN 54 or VdS rules in force when they were introduced; since 2008, CE marking to EN 54 has been mandatory for new detectors – which is why we only name currently certified types as replacements.
- Installation by a specialist company only: Replacement and repair of detectors in fire alarm systems required under building law are part of maintenance and are reserved for a specialist company certified to DIN 14675 – even if you only buy the detectors from us. Details under Legal situation.
- Order numbers from Notifier are identical to the type designation (Fire Detection Catalogue 2025, as of 12/2024).
- Image credits and trademarks: Product images © Honeywell / Notifier. The images serve solely to identify the detectors. Brand and product names are the property of their respective owners. Further details in the Legal notice.
Not sure which detector is installed at your site?
Send us your detector list or a photo of the type plate. We will name the suitable replacement and tell you whether new bases are needed.