Abstract: A method for adjusting, calibrating and/or checking a function of a photometric sensor, which is embodied for measuring at least one measured variable in a medium, wherein the sensor works with at least one measuring wavelength and at least one reference wavelength, comprising the steps as follows: mounting a calibration insert in a receptacle provided therefor at the sensor, adjusting, calibrating and/or performing the function check, and removing the calibration insert, characterized in that the transmittance of light of the measuring wavelength and the transmittance of light of the reference wavelength through the calibration insert are different. The invention relates further to a calibration insert.

Abstract: A method for adjusting, calibrating and/or checking a function of a photometric sensor, which is embodied for measuring at least one measured variable in a medium, wherein the sensor works with at least one measuring wavelength and at least one reference wavelength, comprising the steps as follows: mounting a calibration insert in a receptacle provided therefor at the sensor, adjusting, calibrating and/or performing the function check, and removing the calibration insert, characterized in that the transmittance of light of the measuring wavelength and the transmittance of light of the reference wavelength through the calibration insert are different. The invention relates further to a calibration insert.

Abstract: The sensor module includes: a sensor housing; at least one measuring transducer arranged at least partially in the sensor housing for registering at least one measured variable and for producing at least one primary signal influenced by the measured variable; as well as sensor electronics arranged within the sensor housing and connected with the measuring transducer for converting the primary signal delivered from the measuring transducer into a sensor signal. Further provided in the sensor electronics is an energy supply unit, which includes at least one energy storer arranged within the sensor housing for storing energy to be converted in the measuring system. The transmitter module is coupled to the sensor module and includes a transmitter housing and a transmitter electronics accommodated in the transducer housing and electrically coupled with the sensor electronics for converting the sensor signal delivered from the sensor module into measured values representing the at least one measured variable.

Abstract: In a distance measurement to an object, the distance measurement operating according to the FMCW principle, a linear frequency-modulated signal is transmitted and mixed with the signal reflected back from the object, generating a demodulation signal with a frequency proportional to the distance. To determine the distance, at least one estimation signal with an assumed frequency and a variable phase is generated and an estimation error is determined by comparison of the transmitted signal and the estimation signal. The phase of the estimation signal is adaptively varied for the purpose of an error reduction and the frequency of the estimation signal is corrected corresponding to the variation of the phase over time, the distance being determined from the frequency corrected in this manner.