The minimum calibration programme includes for the volumetric gas flow meters 6 flow rate values repeated once (i.e. 12 measuring points)
and for every other types 5 flow rate values repeated once (i.e. 10 measuring points).
For devices functioning at a steady flow rate point, the latter will be repeated twice (i.e. 3 measuring points).
The calibration is performed at ambient temperature.
Fields and best calibration uncertainties
* limited to 600 Nm3xh-1
|dry air *,
humid air **,
to 5 000 cm3xh-1
to 300 m3xh-1
to 2030 **m3xh-1
** on demand for soap bubble flow meters and water guard meters
*** for an upstream pressure of the device to be calibrated around 100 kPa
qvr : reference volume flow rate