High airflow changes how smoke reaches a detector
Supply, return and rack airflow can dilute, transport or bypass localized smoke. Very early detection does not predict a fire. It continuously draws air from representative locations into a sensitive detector so an investigation signal can be raised while the event is still developing, giving operators time to follow an agreed response.
- The design problem is not sensitivity alone; sampling locations, transport time, thresholds and airflow form one system.
- Above-rack, ceiling-void, underfloor and return-air sampling should follow risk, airflow and maintenance access.
- Battery hazards may also need gas, temperature or battery-management monitoring; smoke detection does not replace those measures.
Suitable facilities and project stages
Air sampling can support new-build, expansion and live retrofit work, particularly where airflow can dilute early smoke, critical operations need staged response, or point detectors are hard to maintain. A retrofit also requires outage planning, route surveys, legacy-interface checks and controls for live operations.
- Candidate areas include data halls, network and electrical spaces, UPS areas, return-air paths and protected equipment rooms.
- Use, zoning and acceptance remain subject to local rules, fire engineering and the authority having jurisdiction.
System composition and project boundary
A deliverable system normally includes sampling pipework, detector, power and supervision, alarm and fault interfaces, labels, test tools and maintenance information. The ASD can report to a fire alarm system. BMS or DCIM may receive operational status, but should not take over statutory alarm or control logic without approved fire design.
- Fire discipline: risk zones, detection design, alarm logic and acceptance basis.
- MEP and low voltage: routes, power, communications and physical installation conditions.
- IT operations: response contacts, critical-load actions, change windows and escalation.
Verifiable deliverables
Acceptance should cover more than power-on. Retain the sampling layout, design or calculation record, threshold and delay baseline, interface schedule, alarm and fault tests, transport-time verification, training and maintenance plan. Changes to airflow, rack layout or thresholds should trigger impact review and retesting where needed.
International product data from the latest supplied brochure
The figures below come from the supplied SecuriSmoke ASD product brochure V2.0 EN, document 831055. Alarm and pre-signal sensitivity are separated, and EN 54-20 network limits are not mixed with other configurations.
| Model | Official positioning and channels | Monitoring area and EN 54-20 network | Alarm, pre-signal and environment |
|---|---|---|---|
| ASD 535-3 | For large monitoring areas; one channel with smoke-level indicator | 2,880 m²; 300 m; class A / B / C holes 18 / 56 / 120 | Alarm 0.02%–10%/m; pre-signal from 0.002%/m; IP54; −30 to +60°C |
| ASD 535-4 | For large monitoring areas; two independent channels with smoke-level indicators | 5,760 m²; 2 × 300 m; class A / B / C holes 35 / 112 / 240 | Alarm 0.02%–10%/m; pre-signal from 0.002%/m; IP54; −30 to +60°C |
| ASD 532 | For medium-sized monitoring areas; one channel with smoke-level indicator | 1,280 m²; 120 m; class A / B / C holes 8 / 12 / 16 | Alarm 0.02%–10%/m; pre-signal from 0.002%/m; IP54; −20 to +60°C |
| ASD 531 | For small monitoring areas; one channel | 720 m²; 75 m; class A / B / C holes 6 / 8 / 12 | Alarm 0.02%–10%/m; pre-signal from 0.006%/m; IP54; −10 to +55°C |
Do not combine these international / EN 54-20 figures with the separate V2606 Chinese configurations. Final pipe design, response time, approval scope and jurisdiction require project confirmation. The ASD 2000 family is outside this page.
Sources: S3
Implementation flow from risk to acceptance
The outputs should be reviewable by fire, MEP, low-voltage and IT operations teams, not just a device list.
- 01
Risk and airflow baseline
Confirm the protection objective, space boundary, airflow, rack layout, live constraints and applicable requirements.
Output: risk-zone map and design-input register - 02
Sampling and alarm design
Define sampling points, pipework, detector location, warning levels, fault supervision and service paths.
Output: pipe layout, design record and alarm matrix - 03
Interface and installation
Freeze fire alarm, BMS/DCIM, power, communication and physical-work interfaces.
Output: interface register, point list and installation checks - 04
Test and handover
Verify sampling, transport time, staged alarms, faults, interfaces and the operating response.
Output: test records, baseline, training and maintenance plan
EVIDENCE
Securiton ASD data center cases
Supplied Securiton project material contains nine data center and critical-facility ASD records. The case page shows customer, location, year, model mix and quantity where listed and does not fill fields absent from the files.
- Records
- 9
- Product scope
- ASD 532 / ASD 535 family
- Year range
- 2009–2021
Published fields include project name, location, year, model, quantity and selected sampling scope where explicitly listed.
The supplied material does not fully state every project's protected-zone schedule, sampling design, thresholds, acceptance record or operating metrics.
Verifiable content is limited to the project and product-application fields listed in the files; unlisted alarm performance, acceptance conclusions or continuity metrics are not added.
Sources: S6
Frequently asked questions
Is the highest possible sensitivity always better?
No. Thresholds must be designed with airflow, background conditions, the response procedure and nuisance-alarm management. High sensitivity without a response process can create ineffective alarms; low sensitivity can lose warning time.
Can an ASD directly release a suppression system?
Permission and logic depend on local rules, approved fire design and the risk strategy. An ASD can provide alarm signals, but this page does not equate a warning level with a suppression-release condition.
Can a retrofit retain old thresholds and sampling points?
Not by default. Airflow, rack density, partitions, return paths and operating procedures may have changed. Establish the current baseline before deciding what can be reused.
Does ASD replace battery thermal-runaway monitoring?
Not universally. Smoke, gas, temperature and battery-management monitoring observe different precursors. A risk assessment should determine the combination.
Manufacturer, standards and public technical sources
Source IDs connect the claims, table, process and evidence to their basis. Standards are frameworks only; the project team must confirm edition and jurisdictional applicability.
- S1 · SecuritonSecuriSmoke ASD 531 / 532 / 535 product page
Official entry for the product family and aspirating detection application.
- S2 · SecuritonSecuriSmoke ASD for data centers
Manufacturer application context for airflow and early detection in data centers.
- S3 · SecuritonSecuriSmoke ASD product brochure, V2.0 EN, document 831055
Supplied current international basis for model positioning, monitoring area, EN 54-20 network limits, alarm and pre-signal sensitivity, display and environment.
- S4 · ISOISO/IEC 22237-1:2021 Data centre facilities and infrastructures
General framework for data center facilities, lifecycle, availability and management.
- S5 · NFPANFPA 75, Standard for the Fire Protection of Information Technology Equipment
Public fire-protection source only; the project authority determines applicability and edition.
- S6 · SecuritonSupplied Securiton data center project-reference records
Basis for the nine visible project records; only fields explicitly listed in the supplied files are used.
- S7 · SecuritonSupplied product certificate files for ASD 531, ASD 532 and the ASD 535 family
Used to map certificate evidence by model or family. Current validity, jurisdiction, scope and permitted mark use must be confirmed before procurement or publication.
This page frames project inputs and is not fire engineering, a compliance conclusion or a performance promise. A qualified specialist must confirm model, sampling design, thresholds, interfaces, tests and applicable requirements against site conditions and current manufacturer documents.