ASD 533

ASD 533

Design and function

ASD 533 Aspirating Smoke Detector

The ASD 533 (Aspirating Smoke Detector) is the latest generation of a highly sensitive, active smoke detection system from Securiton, now available in the UK from Patol Ltd. It is based on the successful ASD 535 and is particularly well suited for monitoring smaller areas and sampling distances where a reduced sampling pipe network is sufficient.

The ASD 533 consists of a fan, a highly sensitive smoke sensor, an airflow measurement system, and evaluation electronics. The fan draws in air through sampling holes, from the room or facility being monitored, and then through a sampling pipe to the evaluating processor unit. Here the air samples are continually monitored for smoke particles by the smoke sensor. Airflow monitoring ensures that the sampling pipe is constantly checked for pipe breakage and any obstruction of the sampling holes.

The display and control panel of the evaluating processor unit indicates alarm, fault and status reports. Any increase in smoke concentration levels is detected very early. Three pre-alarm and two main alarms can be programmed and forwarded to a fire alarm control panel via volt free relay contacts.

The ASD 533 is suitable whenever conventional point-type smoke detectors cannot be used. This may be due, for example, to ambient conditions (too hot, too cold, too dirty) or because operating conditions are such that access is highly restricted (prisons, false ceilings, clean rooms, laboratories, highrack storage facilities, etc.). Or because lightning-fast detection is required, e.g. in data centres.

A high-power LED, combined with a Large Volume Smoke Chamber (LVSC), results in unparalleled adjustable sensitivity with low aerodynamic resistance and the utmost resistance to soiling and contamination. These features ensure long system service life and durability. Commissioning and maintenance of the ASD 533 is done via the ASD Config PC Tool, and are calculated using the ASD PipeFlow software. This makes it possible to configure more cost-efficient asymmetrical pipe layouts. The optional MCM35 memory card module allows extensive long-term smoke level recordings (e.g. smoke and airflow values) to be stored directly on the SD memory card and analysed on your PC.

Product Gallery

ASD 533
ASD 533



The ASD 533 typical applications:

  • Elevator shaft monitoring
  • Museums, galleries, theatres, and cinemas
  • Collections of cultural artefacts, historical buildings, IT and data centres
  • Telecommunication centres
  • Laboratory and research centres
  • Transformer rooms
  • Clean rooms
  • Telecommunication facilities
  • High and Low Voltage distribution cabinets
  • Display cases
  • EDP facilities
  • CNC control systems
  • Prison cells
  • Protection of cultural assets



  • Latest generation of aspirating smoke detectors for less complex applications
  • 1 sampling pipe/1 detector
  • EN 54-20 classes A, B, and C
  • 5 alarm levels (3 pre-alarms and 2 alarms)
  • Response sensitivity settable from 0.002–10%/m
  • Insensitive to dirt particles thanks to particle suppression
  • Auto-learning function
  • Low noise level, compliant with ISO 11690-1
  • Perfected smoke detection thanks to HD sensor (high-dynamic technology)
  • Low power consumption
  • ASD Config PC tool
  • ASD PipeFlow calculation tool



  • Supply Voltage: 10.5 - 30
  • Vdc Supply Current: 130mA
  • Quiescent (typical) (@24 Vdc)
  • Alarms 1 & 2:   0.02 - 10%/m (0.00087-0.457 dB/m)
  • Pre-alarms 1, 2 & 3: 0.002 - 9%/m (10% increments)
  • Interfaces:  Alarm, Fault, Prog Service interface  3 Relays / Open Collector USB
  • No. of Expansion: 4 Slots (SLM35, MCM35, 2 x RIM35)
  • Relay Rating: 30 Vdc / 1Amp
  • Standards: EN 54-20, classes A, B and C
  • Approvals: Vds G registered, 0786 CPD registered
  • Temperature:- -20°C to +60°C
  • IP Rating:  IP 54 (achieved without limitations)
  • Weight: Approx 3,200g
  • Event Memory: Max 430 events (without MCM35)
  • Analogue Logging: Max 1 year events (with MCM35)
  • Cable Entries: 4 x M20, 1 x M25
  • Fan Type: Radial, (speed not adjustable)
  • Fan Service Life: 65,000 hours (@40°C)  
  • Suction Noise: 32 dBA Typical
  • System Limits:
    • Class A: 7 Sampling Holes / 50m
    • Class B: 9 Sampling Holes / 70m
    • Class C: 12 Sampling Holes / 80m
  • Enclosure:
    • Dimensions: H-348mm x W-263mm x D-148mm
    • Colour: RAL 280 70 05 and RAL 300 20 05
    • Material: ABS blend, UL 94-V0

Ordering Information

Ordering Information


Aspirating Smoke Detector ASD533

Replacement Smoke Sensor SSD533

Relay Interface Module RIM35

Memory Card Module MCM35

SD Memory Card (2Gb)

USB Cable 4.5m

Sampling Pipe

Part Number







Refer D1316

Accessories and Options

Accessories and Options

With the exception of the flame arrester and the accessory parts for deep-freeze applications, the ASD 533 is compatible with all the usual ASD 535 sampling tubes with D=25mm, and other accessories. All of these can also be calculated using ASD PipeFlow.

The device concept is compatible with the use of the following options:

  • Relay interface module RIM35
  • Memory card module MCM35
  • No provision is made for networking with SIM35 (RS 485)