GOST R 51657.5-2002 Water flow measurement in hydromelioration and water sypply systems. Manner of measurement of water discharge using the ultrasonic (acoustic) velocity meters. General technical requirements
2002GOST R 51657.5-2002 Water flow measurement in hydromelioration and water sypply systems. Manner of measurement of water discharge using the ultrasonic (acoustic) velocity meters. General technical requirements