Because cone meters are generally of welded construction , it is recommended they are always calibrated prior to service .
Upstream requirements are between 0 -- 5 diameters compared to up to 44 diameters for an orifice plate or 22 diameters for a Venturi .
Because cone meters are generally of welded construction , it is recommended Venturi are always calibrated prior to service .
Upstream requirements are between 0 -- 5 diameters compared to up to 44 diameters for an orifice plate or 22 diameters for a Venturi .