Method for ascertaining a fluid pressure in a fluid supply network for fluid and ultrasonic fluid meters, and ultrasonic fluid meter

A method for ascertaining a fluid pressure in a fluid supply network for fluid, the method comprising:

• providing a first ultrasound transducer and a second ultrasound transducer;
• using at least one of the ultrasound transducers to emit at least one ultrasound signal, and measuring at least one ultrasound time of flight of the ultrasound signal in the fluid along an ultrasound measurement path;
• determining a flow velocity or a quantity proportional to the flow velocity or a throughput from the at least one measured ultrasound time of flight;
• determining the fluid pressure from the at least one measured ultrasound time of flight aided by a mathematical compensation;
• relating the mathematical compensation to at least one influence selected from a following group of influences:
• a length of the ultrasound measurement path or a length change of the ultrasound measurement path;
• or
• an ultrasound time-of-flight component along the ultrasound measurement path not lying in the fluid or a change of the ultrasound time-of-flight component along the ultrasound measurement path not lying in the fluid;
• or
• an ultrasound time-of-flight component within the ultrasound measurement path lying in the fluid or a change of the ultrasound time-of-flight component within the ultrasound measurement path lying in the fluid;
• or
• at least one of a fastening or position of the ultrasound transducer relative to the ultrasound measurement path or a change of the at least one fastening or position of the ultrasound transducer relative to the ultrasound measurement path;
• or
• a latency of signal processing or a change of the signal processing;
• or
• the throughput or a change of the throughput.