Description
The Smart Flame Sensor & Relay Control Module is a standalone fire-detection switch that automatically triggers an electrical load when a flame is detected. It combines an infrared flame sensor (sensitive to 760–1100nm wavelengths) with a comparator circuit and an electromagnetic relay, allowing direct control of alarms, sprinklers, or ventilation systems without a microcontroller .
The module is available in 5V or 12V DC variants (not a single selectable unit—verify your stock). An onboard potentiometer sets the flame-detection threshold: when the sensor detects a flame exceeding the set intensity, the relay energizes and connects the common terminal to the normally-open (NO) contact . Power and relay-status indicator LEDs provide visual feedback. The compact PCB measures approximately 50×26mm with mounting holes for easy installation .
The flame sensor is most sensitive to flame but also responds to sunlight, which can cause false triggers in outdoor or brightly lit environments . This is a fundamental limitation of low-cost IR flame sensors and must be clearly stated to customers.
Critical limitations: This is a budget-tier module intended for educational, hobbyist, and light commercial use. It is not a life-safety certified fire detection device and should not replace commercial fire alarm systems. The relay provides on/off switching only, not proportional control. The detection angle is approximately 60 degrees, and lighter-flame detection distance is about 80cm .
Features
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Infrared Flame Detection: Sensitive to 760–1100nm wavelengths characteristic of flames
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Standalone Relay Switching: No microcontroller required; the comparator directly triggers the relay when flame exceeds threshold
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Adjustable Sensitivity: Onboard potentiometer sets the flame-detection threshold
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Isolated Relay Output: Dry contacts rated for 10A at 250V AC or 30V DC (typical)
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Dual Voltage Options: Available in 5V or 12V DC variants
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Indicator LEDs: Power and relay-status LEDs for calibration feedback
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Compact PCB with Mounting Holes: Approximately 50×26mm
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60-Degree Detection Angle: Suitable for directional flame detection
Technical Specifications
| Parameter | Specification (typical) |
|---|---|
| Sensor Type | Infrared flame sensor (photodiode) |
| Detection Wavelength | 760–1100 nm |
| Supply Voltage | 5V DC or 12V DC (variant-dependent) |
| Supply Current | >150mA (some sources list >200mA) |
| Relay Contact Rating | 10A @ 250V AC or 30V DC (typical) |
| Detection Angle | ~60 degrees |
| Detection Distance (lighter) | ~80cm |
| PCB Size | Approx. 50×26mm |
| Relay Type | SPDT (COM/NO/NC) |
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