Digital detectors are just as suitable for the use in gas analysis and flame sensing as detectors with analogue signal output. But especially if the environmental conditions require a compact and easy-to-integrate detector, a detector with integrated digitisation will be a good choice. Thus, among other things, the digital version is suitable for the field of air-conditioning and building technology when it comes to measuring air quality. Since this correlates well with the carbon dioxide concentration in the air, the CO2 content of the room air is used for demand-controlled ventilation control in buildings and rooms. The CO2 concentration is measured according to the principle of non-dispersive infrared measurement technology. For this purpose, suitable IR filters are integrated into the detector in order to be able to make an accurate and reproducible measurement. This ensures good air quality at all times. In this context, the compactness of the detector, which results from the integration of the entire signal pre-processing, is an advantage. Another benefit is the low sensitivity of the digital output signal to interference caused by mobile phone networks, Bluetooth or wi-fi. In flame sensor technology, pyroelectric detectors capture spectral ranges that are characteristic for burning organic substances such as wood, natural gas, petrol and various plastics. Flame sensors are used in the fields of industrial fire protection and early fire detection and withstand even the most adverse environmental conditions. Due to the low interference sensitivity of the digital detector, the risk of false alarms caused by electromagnetic interference sources is significantly reduced.