Multi-Sensor Smoke Heat CO Detector EN 54-29

Three Sensors. One Algorithm. 90% Fewer False Alarms. EN 54-29 Certified.

A smoke-only optical detector responds to all visible smoke — including cooking fumes, steam, and dust. A heat detector responds to all heat — including hot air from kitchen equipment, HVAC systems, and industrial processes. A CO detector responds to all carbon monoxide — including vehicle exhaust near loading bays and cigarette smoke. Each single-technology detector is prone to false alarms in environments where its detection principle is exposed to non-fire stimuli.

The multi-sensor detector combines optical smoke, thermistor heat, and electrochemical CO sensing in a single unit and applies a weighted algorithm that evaluates all three signals together — generating an alarm only when the combined signature is consistent with a genuine fire event. The result is a 90% reduction in false alarm rate compared to smoke-only detection in challenging environments, while maintaining or improving genuine fire detection speed.

Key Features

Three Independent Sensing Elements: Optical smoke sensor (light scattering chamber), thermistor heat sensor (fixed temperature + rate-of-rise), and electrochemical CO sensor — three completely independent measurement technologies in a single detector body
Weighted Combination Algorithm: Proprietary fire discrimination algorithm assigns weighted confidence scores to each sensor reading — a single sensor reading that could be non-fire is insufficient to trigger an alarm; the combination of elevated readings across multiple sensors in a fire-consistent pattern triggers alarm with high confidence
90% False Alarm Reduction vs. Smoke-Only: Field data from comparable installations demonstrates approximately 90% reduction in nuisance alarms when multi-sensor detectors replace smoke-only detectors in high-challenge environments — kitchens, car parks, manufacturing areas, sports halls, and similar spaces
EN 54-29 Multi-Sensor Certification: EN 54-29 is the specific European standard for multi-sensor fire detectors using combined sensing elements — certification confirms that the combined algorithm achieves both the sensitivity of a single-technology detector and the specificity reduction of multi-technology discrimination; the most rigorous and appropriate certification for this detector type
CO Detection Range: 0–300 ppm: Electrochemical CO sensor monitors CO concentration continuously — at fire-level concentrations (typically >100 ppm from smouldering fires), CO triggers the algorithm; at occupational exposure levels from vehicle exhaust or incidental sources, CO alone does not trigger alarm
Fixed Temperature + Rate-of-Rise Heat: Thermistor heat sensor triggers at 58°C fixed temperature (classic heat detection) AND at any ambient temperature rise exceeding 8°C/min (rate-of-rise detection for fast-flaming fires) — two independent heat detection modes in one sensor element
Operating Temperature −10°C to +60°C: Suitable for all standard commercial and industrial interior environments; the CO sensor maintains calibration across the full temperature range without drift-induced false alarms
Addressable Loop Compatible: Individual address on the signalling line circuit — the panel displays the specific multi-sensor detector's location, current sensor readings (smoke density, temperature, CO level), and alarm state
Detector Test Button: Local test button initiates a simulated alarm on the detector — the panel receives an alarm from the specific address, confirming detector communication and panel response without requiring the use of a remote test magnet or smoke generator

Technical Specifications

Parameter	Specification
Sensing Elements	1× Optical (light-scattering), 1× Thermistor (heat), 1× Electrochemical (CO)
Algorithm	Weighted multi-parameter fire discrimination
EN Standard	EN 54-29 (multi-sensor fire detectors)
False Alarm Reduction	~90% vs. smoke-only in high-challenge environments (typical)
Smoke Detection	Optical, scattered-light; equivalent sensitivity to EN 54-7
Heat Detection — Fixed	58°C class A2
Heat Detection — Rate of Rise	8°C/min (above baseline)
CO Detection Range	0–300 ppm
CO Alarm Threshold	Configurable (typically >80 ppm sustained = contributes to algorithm)
Protocol	Addressable loop (panel-specific)
Loop Current (Standby)	≈400μA
Loop Current (Alarm)	≈8mA
Drift Compensation	Yes (optical chamber and CO baseline)
Test Button	Yes (local test initiates simulated alarm)
Operating Temperature	−10°C to +60°C
Humidity	10–93% RH (non-condensing)
Typical Coverage	60m² (consistent with smoke detector spacing)
Mounting Height	Up to 10m
Base	Twist-lock (standard + isolator base options)
Dimensions (approx.)	Ø 110mm × 55mm (H)
Weight (approx.)	165g
Colour	White (RAL 9010)
Certifications	EN 54-29; CE; (LPCB listed — model specific)

Typical Applications

Hotel Kitchen and Restaurant Back-of-House: The highest false alarm environment in commercial buildings — cooking fumes, steam, and grease-laden air trigger smoke detectors constantly; multi-sensor algorithm correctly identifies the difference between a smoky grill and a fire in the kitchen hood
Car Park — Underground and Multi-Storey: Vehicle exhaust fumes generate CO and particulate aerosols that trigger smoke-only detectors; the multi-sensor algorithm correctly identifies sustained CO and smoke consistent with a vehicle fire while ignoring normal exhaust levels during peak car park usage
Sports Hall and Gymnasium: Physical activity generates body heat, CO₂, and aerosol (sports surface dust, gymnastics chalk, aerosol deodorant); multi-sensor combination correctly ignores these stimuli while detecting a genuine fire in the sports equipment storage or electrical distribution area
Industrial Manufacturing Area: Process heating, dust, and fumes create a challenging environment for single-technology detectors; the CO + heat + smoke combination correctly identifies fire-generating events while ignoring process-generated stimuli
University Chemistry Laboratory: Chemical fumes and vapour releases can trigger smoke detectors; the CO and heat combination provides a more fire-specific alarm signature in chemical laboratory environments
Data Centre with Raised Floor: Airflow patterns under raised floors carry smoke horizontally before it reaches ceiling-mounted detectors; the multi-sensor combination provides earlier detection in the complex airflow environment of a raised floor data hall

Compatibility & Integration

Multi-sensor detectors use the same twist-lock base and addressable loop protocol as the equivalent manufacturer's optical smoke detectors — they are fully interchangeable in the addressable loop infrastructure. The fire alarm panel displays individual sensor readings (smoke density, temperature, CO level) for each multi-sensor detector — providing maintenance engineers with diagnostic information and enabling pre-alarm threshold monitoring for proactive response.

SSAL Supply & Support

Smart Safety & Automations Ltd. specifies multi-sensor detectors in environments where single-technology detection performance is inadequate — high false alarm rate areas (kitchens, car parks, manufacturing), unusual fire types (CO-generating smouldering fires in data centres), and spaces where false alarms are operationally disruptive (operating theatres, trading floors, occupied hotel areas). SSAL programs multi-sensor algorithm sensitivity parameters during commissioning to match the specific environmental characteristics of each installation space. Annual Maintenance Contracts include multi-sensor calibration verification and CO sensor drift test.

Request a Quote

Intelligent multi-sensor fire detection for complex environments. Contact SSAL today.

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Email: info@smartsafety.com.bd
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Multi-Sensor Detector (Smoke + Heat + CO, Addressable, EN 54-29 Certified)

Product Summary