Native technical comparison
ASD 531, ASD 532,
ASD 535-3 or ASD 535-4?
The decisive differences are channel structure, sampling-network capability, environment and interface requirements—not headline area alone.
| Decision factor | ASD 531 | ASD 532 | ASD 535-3 | ASD 535-4 |
|---|---|---|---|---|
| Typical project scale | Small, concentrated zones and short networks | Medium critical spaces and high-sensitivity single-pipe systems | Large single zones, long networks, high or low-temperature spaces | Two independent zones or separately calculated networks |
| Detection channels and structure | 1 channel / 1 sampling network | 1 channel / 1 sampling network | 1 high-performance channel / 1 sampling network | 2 independent channels / 2 sampling networks |
| International brochure monitoring area | 720 m² | 1,280 m² | 2,880 m² | 5,760 m² |
| Mainland China product-sheet reference | 800 m²; 80 m; 20 holes | 1,500 m²; 150 m; 20 holes | 2,000 m²; 300 m; 60 holes | 4,000 m²; 600 m; 120 holes |
| EN 54-20 pipe capability | 75 m; Class A / B / C holes: 6 / 8 / 12 (Classes A / B / C) | 120 m; Class A / B / C holes: 8 / 12 / 16 (Classes A / B / C) | 300 m; Class A / B / C holes: 18 / 56 / 120 (Classes A / B / C) | 2 × 300 m; Class A / B / C holes: 35 / 112 / 240 total (Classes A / B / C) |
| Sensitivity and related performance | Alarm 0.02% to 10% obs/m; pre-signal From 0.006%/m; suction > 30 Pa | Alarm 0.02% to 10% obs/m; pre-signal From 0.002%/m; suction > 100 Pa | Alarm 0.02% to 10% obs/m; pre-signal From 0.002%/m; suction > 400 Pa | Alarm 0.02% to 10% obs/m; pre-signal From 0.002%/m; suction > 400 Pa per channel |
| Environment | -10 °C to +55 °C; IP 54; up to 95% RH, non-condensing | -20 °C to +60 °C; IP 54; up to 95% RH, non-condensing | -30 °C to +60 °C; IP 54; up to 95% RH, non-condensing | -30 °C to +60 °C; IP 54; up to 95% RH, non-condensing |
| Interfaces and networking | No PC connection; No network interface | Ethernet; RS-485 and Ethernet | USB; Optional RS-485; no native Ethernet | USB; Optional RS-485; no native Ethernet |
| On-board event memory | 1,000 events on board | 1,000 events on board | 430 events on board | 430 events on board |
| Recommended applications | Individual server racks, Small equipment rooms, Clean rooms, False ceilings | Data rooms, Clean rooms, Laboratories, Telecommunications facilities | Large data centres, High-bay storage, Deep-freeze warehouses, Large or high halls | Large data centres, Two-zone protection, Large logistics facilities, Critical infrastructure |
| Main limitations | Not intended for long, two-zone or below -10 °C projects; no ASD 532 Ethernet capability. | Not intended for two independent channels, very large networks or below -20 °C environments. | One independent channel; not a substitute when two zones require separate judgement. | Usually excessive for a small single zone; both channels require separate calculation and identification. |
| Inputs required before selection | Confirm short-network fit and interface, display and temperature requirements. | Provide HVAC states, return-air / room strategy and integration requirements. | Confirm one large independent zone; provide long-network, low-temperature and contamination conditions. | Define two zone boundaries, two PipeFlow models, power and independent alarm logic. |
| Official source | SECURITON SecuriSmoke ASD Product Brochure V2.0 EN, document 831055 10.25; Product Manual V2606 for separately labelled mainland China values | SECURITON SecuriSmoke ASD Product Brochure V2.0 EN, document 831055 10.25; Product Manual V2606 for separately labelled mainland China values | SECURITON SecuriSmoke ASD Product Brochure V2.0 EN, document 831055 10.25; Product Manual V2606 for separately labelled mainland China values | SECURITON SecuriSmoke ASD Product Brochure V2.0 EN, document 831055 10.25; Product Manual V2606 for separately labelled mainland China values |
A candidate model becomes a project decision only after destination-market approval review, a current ASD PipeFlow report and competent fire-strategy coordination.
Selection questions
Direct answers for the first screening step.
What is the key difference between ASD 531 and ASD 532?
ASD 532 offers a lower pre-signal threshold, higher suction pressure, a wider temperature range, a 10-level display and network interfaces. ASD 531 is suited to compact, short-network projects.
How should ASD 535-3 and ASD 535-4 be selected?
Use ASD 535-3 when one independent channel satisfies the project. Evaluate ASD 535-4 when two zones require independent sampling, indication or control.
Can a model be selected by maximum area?
No. Approval, class, pipe length, holes, transport time, airflow, environment, interfaces and maintenance must also be satisfied in a project-specific calculation.
Turn the comparison into a project decision.
Submit the application, protection area, environmental conditions, pipe-network information, destination market and project stage.