Abstract: The invention relates to a method for calibrating the transmitters of ultrasonic flow meters according to the transit time difference method. The object of the invention is to provide a method for calibrating the transmitters of ultrasonic flow meters, said calibration being able to be carried out independently of the other components of the meter, such as the acoustic transducers and the pipe in which the fluid flow being measured occurs. According to the invention, the measurement signals are generated by means of an artificial simulation of the measurement path. This allows the transmitter to be calibrated independently of the remaining components of the measuring apparatus, such as the measuring tube and the acoustic transducers.

Abstract: The invention relates to a method for calibrating the transmitters of ultrasonic flow meters according to the transit time difference method. The object of the invention is to provide a method for calibrating the transmitters of ultrasonic flow meters, said calibration being able to be carried out independently of the other components of the meter, such as the acoustic transducers and the pipe in which the fluid flow being measured occurs. According to the invention, the measurement signals are generated by means of an artificial simulation of the measurement path. This allows the transmitter to be calibrated independently of the remaining components of the measuring apparatus, such as the measuring tube and the acoustic transducers.

Abstract: A position difference is created by mutual translation of sound transducers and the associated time difference is measured. Radiating surfaces of both sound transducers are arranged acoustically opposing one another in planes that are parallel to one another. The sound transducers are positioned at a mutual distance x0+xd, and sound transit time t1 between the sound transducers is measured, wherein position x0 is the distance for optimum acoustic coupling of the two sound transducers and xd is the deviation from this position that is designated as the deviation. The sound transducers are repositioned at another mutual distance x0+xd+?x, and the sound transit time t2 between the sound transducers is measured. An acoustic calibration factor Ka is calculated from the distance difference ?x and the time difference ?t=t2?t1 using the formula Ka=?x/?t.

Abstract: A position difference is created by mutual translation of sound transducers and the associated time difference is measured. Radiating surfaces of both sound transducers are arranged acoustically opposing one another in planes that are parllel to one another. The sound transducers are positioned at a mutual distance x0+xd, and sound transit time t1 between the sound transducers is measured, wherein position x0 is the distance for optimum acoustic coupling of the two sound transducers and xd is the deviation from this position that is designated as the deviation. The sound transducers are repositioned at another mutual distance x0+xd+?x, and the sound transit time t2 between the sound transducers is measured. An acoustic calibration factor Ka is calculated from the distance difference ?x and the time difference ?t=t2?t1 using the formula Ka=?x/?t.