PROCESS AND DEVICE FOR DETERMINING THE LEVEL OF A FLUID USING ULTRASONIC PULSES

摘要

In order to improve the measuring accuracy of a liquid level (H) in a container (2) from an echo time measurement of ultrasonic pulses and a mean sound velocity (.dottedcircle.), it is provided to extrapolate the mean sound velocity (.dottedcircle.) from at least two reference sound velocities in the liquid (90). It is possible in this way to achieve a measuring accuracy of less than a millimetre independently of the liquid level (H). Specified for carrying out the method is a device (1) having a main measuring path, at least one device for transmitting and receiving ultrasonic pulses, at least two reference paths for determining sound velocities, and having a computer unit (50), the computer unit (50) extrapolating to the mean sound velocity from the (.dottedcircle.) sound velocities.