The following query was received by a Norac Member:
Can anyone tell me who they use to supply primary air flow calibrator (bubble meter)?
We currently use a master rotameter to calibrate our working rotameters, but we know this is not really the best solution. The people who calibrate the master rotameter for us are somewhat scathing of it as a piece of equipment, saying it does no more than give an indication of flow rate. If other people can suggest any other alternatives for a primary/master flow meter I’d be really pleased to know.
The response can be seen within the attached document.