The new non-radioactive sensor, Voith LSC TecoSens, provides simultaneous online measurement of fiber weight and moisture based on an infrared spectroscopic measurement.With the new sensor fiber weight and moisture measurement can be done with just one sensor and without the need of radioactive sources. With the absence of radioactivity there is no need for special training of the service and maintenance staff. It also eliminates the health risks of working next to the radioactive sources. Furthermore, it creates no need to replace the sensor from time to time due to the limited life time of the radioactive source.The sensor is based on the proven Voith LSC infrared moisture sensor and measures the absorption of infrared light at four characteristic wavelengths. The sensor is only available in combination with the Voith LSC TecoScan measurement system.