Bilateral inter-comparison in the gas flow range from 0.5 m3/h to 75 m3/h with sonic nozzles
Project Description
Sonic nozzles with nominal flow rates from 0.5 m3/h to 75 m3/h will be used to compare primary low-pressure test facilities.
The laboratories should carry out the calibration using their common procedures.
The procedure described in PTB Testing Instruction Volume 25: "Gas meters – Test rigs with critical nozzles" is recommended to be used.
The parameters QV,20,tr,1000 [L/h] and cpE [-] are required to be determined for each sonic nozzle.
Each laboratory will be responsible for the transfer of the sonic nozzles to the next laboratory. No other costs are expected.
Test conditions:
- Test gas: air
- Upstream sonic nozzle pressure: near atmospheric
- Relative humidity: less than 75 %
- Test temperature: (19.5 ÷ 22.5) °C