State primary gas flow standard-ДЕТУ 03-01-15

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.