Calibration of modular fill-level gauges

A method for manufacturing and calibrating a modular fill-level gauge, comprising:

• providing the fill-level gauge that is based on a capacitive, an ultrasonic, or a radar-based measuring principle, the fill-level gauge including:
• a transmission module into which an alternating voltage signal is coupled such that the signal is transmitted in a direction of a reflector and after reflection is received as a corresponding received variable;
• a sensor module, including:
• a signal production unit designed to produce the alternating voltage signal according to the appropriate measuring principle;
• and
• an evaluation unit designed to convert the received variable via a calibration function into a sensor signal that represents a distance between the fill-level gauge and the reflector;
• and
• an electronics module designed to use a known, installed height to convert the sensor signal into a standardized measured value signal representing the fill-level, the electronics module including:
• a first interface to the evaluating unit to receive the sensor signal;
• and
• a second interface to output the measured value signal to a superordinated unit;
• connecting the transmission module with the sensor module;
• calibrating the sensor module, unconnected to the electronics module, by:
• transmitting the alternating voltage signal in a presence of at least one defined distance between the fill-level gauge and the reflector;
• in each case, registering the corresponding, received variable;
• based on the at least one registered, received variable and, in each case, the corresponding distance, creating the calibration function;
• and
• storing the calibration function in the sensor module;
• and
• instructing the electronics module by inputting the installed height of the fill-level gauge;
• and
• connecting the electronics module to the sensor module only after the calibration of the sensor module.