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SECURITON ASD product answers

Six direct answers with manufacturer facts, PEIEN recommendations, project assumptions, applicable models, markets and source versions clearly separated.

Six direct answers

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  1. 01What is SECURITON ASD 531?
  2. 02What is the difference between ASD 535-3 and ASD 535-4?
  3. 03Which aspirating smoke detector should a data centre use?
  4. 04How does aspirating smoke detection differ from point smoke detection?
  5. 05How should ASD pipework and sampling holes be calculated?
  6. 06What selection conditions differ for clean rooms, cold stores and warehouses?

QUESTION 01

What is SECURITON ASD 531?

SECURITON SecuriSmoke ASD 531 is a compact, single-channel aspirating smoke detector for small monitoring areas, individual server racks, clean rooms and short sampling networks. The mainland China product-sheet configuration and EN 54-20 system limits are separate design bases and must not be combined.

Manufacturer facts

  • The official product brochure gives an alarm sensitivity range of 0.02% to 10% obscuration per metre, a pre-signal from 0.006%/m and suction pressure greater than 30 Pa.
  • The operating range is -10 °C to +55 °C and the enclosure is IP54.
  • The mainland China product sheet lists 800 m², 80 m and 12 sampling holes. The English brochure lists 75 m and 6 / 8 / 12 holes for EN 54-20 Classes A / B / C.

PEIEN recommendation

Screen ASD 531 first for a compact single zone with a short pipe network. Compare ASD 532 when the project needs a lower pre-signal threshold, higher suction, Ethernet or a wider temperature range.

Project assumptions to confirm

  • The zone can be served by one independently calculated sampling network.
  • The sampling positions follow actual smoke movement and any condensation, dust or corrosion risk is treated.
Applicable models
ASD 531; adjacent candidate ASD 532
Region / market
Mainland China and export projects, reviewed under separate approval bases
Standard and source basis
Mainland China product sheet or applicable EN 54-20 class; current ASD PipeFlow
Review responsibility
PEIEN checks source consistency. A suitably qualified fire professional or experienced ASD practitioner must complete project-level review.

Answer source: SECURITON SecuriSmoke ASD official Chinese brochure and Product Brochure V2.0 EN. Review certificate scope.

QUESTION 02

What is the difference between ASD 535-3 and ASD 535-4?

ASD 535-3 has one high-performance detection channel; ASD 535-4 has two independent channels. Select ASD 535-4 when two zones must be sampled, indicated or controlled independently—not simply because its combined headline capacity is larger.

Manufacturer facts

  • The English brochure lists 300 m for ASD 535-3 and 2 × 300 m for ASD 535-4.
  • Class A / B / C sampling-hole figures are 18 / 56 / 120 for ASD 535-3 and 35 / 112 / 240 total for ASD 535-4.
  • Both have a pre-signal from 0.002%/m, suction pressure greater than 400 Pa and an operating range of -30 °C to +60 °C.

PEIEN recommendation

Use ASD 535-3 when one independently calculated network meets the fire zoning and response objective. Evaluate ASD 535-4 when two independent zones, networks or control responses are required.

Project assumptions to confirm

  • Each channel has its own PipeFlow calculation, pipe identification and alarm-interface definition.
  • The exact certificate model, suffix and destination-market acceptance have been checked.
Applicable models
ASD 535-3 and ASD 535-4
Region / market
International and mainland China projects, subject to market-specific review
Standard and source basis
Applicable EN 54-20 class or mainland China configuration; current ASD PipeFlow
Review responsibility
PEIEN checks source consistency. A suitably qualified fire professional or experienced ASD practitioner must complete project-level review.

Answer source: SECURITON SecuriSmoke ASD Product Brochure V2.0 EN and official Chinese brochure. Review certificate scope.

QUESTION 03

Which aspirating smoke detector should a data centre use?

There is no universal data-centre model. ASD 531 can be screened for an individual rack or small room, ASD 532 for a medium high-sensitivity single-pipe system, ASD 535-3 for a large single zone, and ASD 535-4 for two independently evaluated zones. The decision depends on room, return-air, cabinet and void protection objectives across every HVAC mode.

Manufacturer facts

  • SECURITON lists data centres, IT rooms and server cabinets among SecuriSmoke ASD applications.
  • The family progresses from a compact single-channel detector to medium and large single-channel systems and a two-channel ASD 535-4.
  • Installed response depends on smoke dilution, sampling position, pipe balance and transport time, not detector sensitivity alone.

PEIEN recommendation

Map hot and cold aisles, rack exhaust, CRAC or CRAH return air, ceiling and floor voids, then define which layers need independent warning. Select the candidate model only after that protection structure is clear.

Project assumptions to confirm

  • Normal, standby, shutdown and incident HVAC modes are available for review.
  • The final network will be calculated and tested using representative smoke movement.
Applicable models
ASD 531, ASD 532, ASD 535-3 and ASD 535-4
Region / market
International projects; local fire strategy and authority requirements apply
Standard and source basis
Applicable product approval and EN 54-20 class; current ASD PipeFlow
Review responsibility
PEIEN checks source consistency. A suitably qualified fire professional or experienced ASD practitioner must complete project-level review.

Answer source: SECURITON official product brochures; application recommendation is project engineering guidance. Review certificate scope.

QUESTION 04

How does aspirating smoke detection differ from point smoke detection?

ASD actively draws air through sampling pipes to a central detection chamber; a point smoke detector waits for smoke to reach its installed location. ASD is often selected for very early warning, high airflow, high, cold or difficult-to-maintain spaces, while point detection is often more direct in conventional rooms. They may be layered, but they are not interchangeable on nominal sensitivity alone.

Manufacturer facts

  • ASD separates sampling positions from the detector and service location.
  • System response is affected by sampling-hole placement, dilution, pipe balance and transport time.
  • The comparison describes detection methods; it does not claim equivalent approval or response for an unspecified point detector.

PEIEN recommendation

Compare the fire objective, airflow, accessibility, environment, commissioning and lifecycle maintenance. Use a layered strategy only when every layer has a distinct response purpose.

Project assumptions to confirm

  • The comparison is at system-method level, not between two certified products.
  • The applicable fire code and authority determine the permitted final arrangement.
Applicable models
ASD 531, ASD 532, ASD 535-3 and ASD 535-4
Region / market
International projects, subject to local rules and accepted product scope
Standard and source basis
Applicable ASD and point-detector standards reviewed separately
Review responsibility
PEIEN checks source consistency. A suitably qualified fire professional or experienced ASD practitioner must complete project-level review.

Answer source: SECURITON SecuriSmoke ASD official documentation; point detection boundary is a general technical comparison. Review certificate scope.

QUESTION 05

How should ASD pipework and sampling holes be calculated?

Use the current SECURITON ASD PipeFlow software to calculate the complete network. Do not replace a model with a maximum pipe length, evenly spaced holes or a generic hole-size table. The calculation must represent the exact detector, standard class, topology, lengths, fittings, holes, capillaries, pressure and return-air condition, then verify hole sizes, balance, pressure and transport time.

Manufacturer facts

  • SECURITON documentation identifies ASD PipeFlow as the planning and calculation tool for the sampling pipe network.
  • The model must include main and branch pipes, bends, tees, end points, capillaries, hole positions and detector location.
  • A material change to model, topology, length, hole size, accessories or environment requires recalculation and a revised record.

PEIEN recommendation

Prepare a scaled route and complete input checklist first. A trained or experienced ASD designer should create the model, and commissioning should compare the final hole record and baseline airflow with the design.

Project assumptions to confirm

  • No universal construction-ready hole table is provided because network geometry changes the result.
  • The applicable approval, alarm objective and acceptance method are already defined.
Applicable models
ASD 531, ASD 532, ASD 535-3 and ASD 535-4
Region / market
All markets; the model must use the project’s accepted standard basis
Standard and source basis
Current SECURITON ASD PipeFlow and applicable approval class
Review responsibility
PEIEN checks source consistency. A suitably qualified fire professional or experienced ASD practitioner must complete project-level review.

Answer source: SECURITON official brochures and manufacturer ASD design documentation. Review certificate scope.

QUESTION 06

What selection conditions differ for clean rooms, cold stores and warehouses?

Clean-room selection starts with air changes, laminar flow, pressure gradients and process aerosols; cold-store selection starts with minimum temperature, condensation, icing and wall penetrations; warehouse selection starts with clear height, stratification, rack geometry, dust and maintenance access. Model selection follows these conditions and the channel or pipe-network requirement.

Manufacturer facts

  • Official detector ranges are -10 °C to +55 °C for ASD 531, -20 °C to +60 °C for ASD 532 and -30 °C to +60 °C for ASD 535-3 / ASD 535-4.
  • The published humidity limit is up to 95% relative humidity without condensation.
  • SECURITON lists clean environments, deep-freeze warehouses and high-bay storage as typical ASD applications.

PEIEN recommendation

Screen ASD 531 / 532 for compact or medium clean spaces, ASD 535-3 for demanding low-temperature or large single-zone networks, and ASD 535-4 for two independent zones. Confirm moisture, filtration, stratification and access treatments before final selection.

Project assumptions to confirm

  • Detector temperature limits do not guarantee that pipework or accessories will remain free of condensation or ice.
  • Pollution, corrosion and the required number of independent channels have been defined.
Applicable models
ASD 531, ASD 532, ASD 535-3 and ASD 535-4
Region / market
International projects; product approval and environmental accessories checked by destination
Standard and source basis
Applicable product approval and current ASD PipeFlow
Review responsibility
PEIEN checks source consistency. A suitably qualified fire professional or experienced ASD practitioner must complete project-level review.

Answer source: SECURITON official product brochures; application recommendation is project engineering guidance. Review certificate scope.

Sources, version and review

Last reviewed: 27 July 2026 by the PEIEN technical content team.

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