Accuracy:

The standard provides reproduction of measurement units with a standard deviation of the measurement result for 40 independent observations which does not exceed:

• gas volume - 0.025%;
• flow rate - 0.025%.

Unrecovered systematic error does not exceed:

• gas volume - 0.04%;
• flow rate - 0.045%.

Uncertainty of measurement

gas volume:

• by type A - 0.025%,
• by type B - 0.023%,
• total standard uncertainty - 0.035%;
• extended uncertainty - 0.07% (with coverage ratio K = 2 and confidence level P = 0.95).

flow rate:

•  volume flow rate of gas by type A - 0.025%,
• by type B - 0.026%,
• total standard uncertainty - 0.036%;
• extended uncertainty - 0.072% (with coverage ratio K = 2 and confidence level P = 0.95).

Flow range (m³/h):

1.0 - 250.0

Means that can be calibrated on the standard:

critical flow nozzles, reference gas meters

Connecting dimensions (DN, mm):

25, 32, 50, 80, 100, 150

Scientific keeper of the standard:

Denys Serediuk, Ph.D.