National (secondary) gas flow standard-НДЕТУ М-04-2019

Accuracy:
The expanded uncertainty of the gas volume and flow rate does not exceed 0.10% (with a coverage factor K = 2 and a confidence level P = 0.95).
Flow range (m3/h):
0.016 - 25.0
Means that can be calibrated on the standard:
critical flow nozzles, reference gas meters
Connecting dimensions (DN, mm):
16, 20, 25, 32, 50
Scientific keeper of the standard:
Volodymyr Hulyk