The flame sensor detects fire by recognizing flame characteristics. When a flame is detected, its output state changes. The detection sensitivity can be adjusted via a potentiometer.

Flame Sensor Module 4-wire

Price range: $1.99 through $2.191pcs
The flame sensor module can detect flame size, and the 4‑wire version retains the analog output interface.

Flame Sensor Module Relay

Price range: $0.99 through $2.191 PCS
The flame sensor relay version integrates a relay and a flame sensor, enabling automatic control of high-power equipment.