This standard is for multi-circuit seconds that measure the flow rate of liquid flowing in a closed pipe or a number of channels with a certain cross-section.
KS B 5640-2001 history
2021KS B 5640-2021 Testing method of multi-path ultrasonic flowmeter
0000 KS B 5640-2001(2016)
2001KS B 5640-2001 Testing method of multi-path ultrasonic flowmeter