Abstract: A fire monitoring system having a first fire detector including a first passive sensor and first electronic circuitry, wherein the first passive sensor is arranged in a first fire cell and the first electronic circuitry is arranged outside the first fire cell and coupled to the first passive sensor. A method for monitoring a fire by means of a first fire detector having a first passive sensor and first electronic circuitry, the method including providing first data from the first passive sensor arranged in a first fire cell to the electronic circuitry arranged outside the first fire cell.