A method for determining a tube inner diameter of a surge pipe by a level measuring device

The invention relates to a method for determining a tube inside diameter (D) of a surge pipe (11) which is suitable for measuring the level (L) of in a process chamber (4) of a container (2) located filling material (3) (in the process chamber is 4), or (next to the container 2) and mounted (with the process chamber 4). The method can be at a level measuring device (1), which works on the FMCW principle, implement. According to the invention is in this case in addition to the intermediate frequency (f The advantage of the method is that the gauge (1) by using the now accurately known pipe diameter (D) can recalibrate and accordingly the level (L) determined more accurately without the tube inside diameter (D) must be previously accurately known.