Dual-Technology Intelligence for Superior Accuracy

The Multi-Sensor Fire Detector (MSD-400) harnesses the power of two distinct sensing technologies—photoelectric smoke detection and thermal sensing—within a single, intelligent unit. By analyzing inputs from both sensors using advanced algorithms, it provides the fastest possible response to real fires while offering unparalleled immunity to common false alarm sources such as dust, steam, and tobacco smoke. This makes it the optimal choice for challenging environments where both rapid detection and reliability are paramount.

Key Features & Benefits:

• Dual-Sensor Algorithm: Cross-references data from an optical smoke chamber and a thermistor for heat, only triggering a full alarm when both sensors indicate a genuine fire signature.
• Drastic False Alarm Reduction: Effectively ignores non-hazardous particulates (dust, insects) and benign thermal rises (sunlight on a wall), saving costs and preventing unnecessary evacuations.
• Addressable Communication: Provides exact location data to the fire alarm control panel (FACP) and reports its operational status (clean/dirty, healthy/fault) for predictive maintenance.
• Adjustable Sensitivity: Can be tuned via the FACP for different environments (e.g., higher sensitivity in archives, lower in dusty boiler rooms).
• Wide Application Range: Perfect for areas prone to nuisance alarms, like hotel bedrooms, kitchens (outside cooking area), warehouses, and industrial workshops.

How It Works:

The detector continuously monitors the environment. A slow increase in smoke with no heat may trigger a "pre-alarm" or be ignored. A rapid temperature rise with little smoke may indicate a fast-flaming fire. When both smoke density and heat rise meet pre-programmed fire profiles, an immediate alarm is signaled.

Technical Specifications:

Sensors	Optical Smoke Chamber & Rate-of-Rise Thermistor
Alarm Thresholds	Programmable (e.g., 0.5-2.0 %/m obscuration, 54°C fixed or 8°C/min rise)
Voltage & Current	15-32 VDC (Loop), Standby: 400µA, Alarm: 50mA
LED Indicator	Dual-color (Green/Red) for Status
Compliance	BS EN 54-5 & BS EN 54-7

Ideal for retrofit projects to upgrade conventional systems and reduce nuisance alarms.