Detectors
Replacing Hekatron detectors: types, successors and bases
Which Hekatron detectors manufactured from 2000 onwards must be replaced, what is still available, which detector replaces older types and when a new base is needed – with the manufacturers’ order numbers.
Detector age
How old is the detector – how long has it been in operation?
- Hekatron: Rating plate with type, item number and date of manufacture or serial number. On Integral systems, detector data can be retrieved via the control panel or the service programs.
- 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.
Hekatron
Which Hekatron detector do you have installed?
Hekatron systems with Integralcontrol panels work with addressable loop detectors of the series …533X (e.g. MTD 533X, CMD 533X) in the base USB 502. Older systems with Hekatron spur line or HX technology contain detectors such as ORM 130A, SSD 521, WDM or ORM 140/150. The type designation is shown on the detector’s rating plate. According to Hekatron, the Integral detectors have been upward and downward compatible for two generations.
Images: Hekatron Brandschutz. Examples shown; housing colour and labelling may vary by type.
No longer available
Older Hekatron detectors: successors for Integral, spur line and HX
For older Hekatron detectors, Hekatron offers dedicated modernisation detectors: MSD 523 and UTD 523 replace smoke and heat detectors on spur lines, MMD 140 and MMD 150 replace HX detectors and communicate via the existing wiring. Whether the base remains depends on the existing base series – we check this using your detector list.
Hekatron Integral, spur line and HX technology
| Image | Old detector | Old type | Available? | Alternative detector | New base? |
|---|---|---|---|---|---|
| Multi-sensor detector Integral, older generation (without X-LINE) | MTD 533 | no – discontinued | MTD 533X (30-5000003-01-06)¹ | no – USB 502 remains |
| Optical smoke detector, spur line (conventional) | ORM 130A | no – discontinued | MSD 523 (5000611)² | on request |
| Smoke detectors of the SSD series, spur line | SSD 521 | no – discontinued | MSD 523 (5000611)² | on request |
| Heat detector, spur line (conventional) | WDM | no – discontinued | UTD 523 (heat class A1, A2 or B)² | on request |
| Optical smoke detector HX, spur line | ORM 140 | no – discontinued | MMD 140³ | on request |
| Optical smoke detector HX, loop line | ORM 150 | no – discontinued | MMD 150³ | on request |
¹ According to Hekatron, the Integral detectors have been upward and downward compatible for two generations; the MTD 533X is twisted into the USB 502 base. ² According to Hekatron, the MSD 523 is backward compatible with the SSD series and replaces the ORM 130A; the UTD 523 replaces WDM detectors. Both are operated with the USB 502 base. ³ According to Hekatron, the MMD 140/150 communicate with older Hekatron system generations via the existing wiring.
Current series
Hekatron Integral: same detector, same base
These Hekatron detectors are available. When replaced on schedule, the detector is exchanged for the same type and the existing USB 502 base remains. The CMD 533X is supported from Integral IP software 7.3 onwards.
| Image | Detectors | Item no. | Available? | Replace with | New base? |
|---|---|---|---|---|---|
| Multi-sensor detector MTD 533X (smoke/heat) | 30-5000003-01-06 | yes | same type | no – USB 502 remains |
| MTD 533X-SCT with sounder (powered via the loop) | 30-5000014-01-01 | yes | same type | no – illuminated ring base optional |
| MTD 533X-SPCT with sounder and voice output (powered via the loop) | on request | yes | same type | no |
| MTD 533X-SES with sounder (powered via Alarmbox Plus) | on request | yes | same type | no |
| MTD 533X-SPES with sounder and voice output (powered via Alarmbox Plus) | on request | yes | same type | no |
| Multi-sensor detector CMD 533X (smoke/heat/CO) | 30-5000006-01-02 | yes | same type | no – USB 502 remains |
| Multi-sensor detector CMD 533X MC (colour version) | 30-5000006-91-02 | yes | same type | no – USB 502 remains |
| Multi-sensor smoke detector MSD 523 (spur line) | 5000611 | yes | same type | no – USB 502 remains |
| Heat detector UTD 523 (spur line) | on request | yes | same type | no – USB 502 remains |
| Modernisation detector MMD 140 (HX, spur line) | on request | yes | same type | on request |
| Modernisation detector MMD 150 (HX, loop line) | on request | yes | same type | on request |
| Smoke detector MMD 130 Ex-i (hazardous (Ex) area, with barrier EXBAR 02) | on request | yes | same type | on request |
“on request”: we will give you the Hekatron order number with the quote.
Bases
Hekatron USB 502 base: when a new base is needed
The Integral detectors (…533X) and the spur line detectors MSD 523 / UTD 523 are twisted into bases of the series USB 502 . If a USB 502 is already installed, it remains during the replacement. New bases are only needed when older detectors with a different base series are modernised.
| Image | Bases | Item no. | Suitable for | Note |
|---|---|---|---|---|
| USB 502-1, detector base with ring contact, surface-mounted | 30-4100005-01-01 | Integral detectors …533X | remains during replacement |
| USB 502-1 MC, detector base, colour version, surface-mounted | 30-4100005-91-01 | Integral detectors …533X | remains during replacement |
| USB 502-2, detector base for suspended ceiling mounting | 30-4100005-02-01 | Integral detectors …533X | remains during replacement |
| USB 502-3, detector base for damp rooms | 30-4100005-03-01 | Integral detectors …533X | remains during replacement |
| USB 502-4, detector base for concrete mounting | 30-4100005-04-01 | Integral detectors …533X | remains during replacement |
| USB 502-5, detector base for raised floors | 30-4100005-05-01 | Integral detectors …533X | remains during replacement |
| USB 502-6, detector base without ring contact, surface-mounted | 30-4100005-06-01 | Integral detectors, MSD 523, UTD 523 | remains during replacement |
| USB 502-6 MC, detector base, colour version, without ring contact | 30-4100005-96-01 | Integral detectors, MSD 523, UTD 523 | remains during replacement |
| USB 502-20, detector base with illuminated ring, without ring contact, surface-mounted | 20-2100019-01-01 | MTD 533X-SCT/-SPCT | alarm output occupied by the illuminated ring |
Base numbers according to Hekatron data sheet CMD 533X (7002791 PB, 3rd edition 11/2015).
Special detectors
Hekatron: wireless, Ex, duct and linear detectors
For large halls, dusty areas and difficult environments, Hekatron offers special fire detectors. The Ex smoke detector MMD 130 Ex-i is listed in the “Current series” table. Hekatron does not offer wireless detectors for fire alarm systems or its own duct detectors in its special fire detector range.
| Image | Detectors | Item no. | Available? | Replace with | Note |
|---|---|---|---|---|---|
| – | Linear beam smoke detector ILIA S/R – low interference (EN 54-12) | on request | yes | same type | – |
| – | Linear beam smoke detector ILIA S/E – moderate interference, e.g. forklift traffic (EN 54-12) | on request | yes | same type | – |
| – | Linear beam smoke detector ILIA DUST PRO – extreme interference (EN 54-12) | on request | yes | same type | – |
| – | Linear heat detector ADW 535 (EN 54-22), also for hazardous (Ex) areas | on request | yes | according to manufacturer’s specifications | – |
 | Aspirating smoke detector ASD 535 / ASD 532 / ASD 531 (EN 54-20) | on request | yes | detector according to manufacturer’s specifications | pipe network remains |
Types according to the Hekatron special fire detectors brochure (7050413). We will give you the order numbers with the quote.
Important
Before ordering
- Check the panel: Whether Integral detectors (…533X) or modernisation detectors can be operated on your fire alarm control panel depends on the panel, software version and wiring technology. 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 Hekatron detectors listed as available are certified to EN 54-5/-7 (CMD 533X additionally to EN 54-26/-29/-30, detectors with sounder to EN 54-3/-23); MMD 130 Ex-i with VdS and ATEX approval. The detectors that are no longer available were approved under the EN 54 or VdS rules applicable when they were introduced; since 2008, CE marking to EN 54 has been mandatory for new detectors – which is why we only list 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 are Hekatron order numbers (source: Hekatron data sheets, last updated: 18.10.2026).
- Image credits and trademarks: Product images © Hekatron Brandschutz. The images serve solely to identify the detectors. Brand and product names are the property of their respective owners. Further information 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.