Ori - Flow Rotameter

The Ori - flow meter measures flow by inserting an orifice at part of the piping, generating differential pressure before and behind the orifice by means of the flow, and extracting this differential pressure by a suitable method. Differential pressure ( P1-P2) of main orifice and the flow Q have shown in equation given below. The flow is proportional to the square root of the differential pressure.

Q : Volumetric flow
C : Flow co-efficient
F : Cross sectional area of orifice hole
g : Acceleration of gravity
P1-P2 : Differential pressure
Y : Specific weight of fluid

The generated differential pressure is sent to a manometer or other differential pressure gauge and a differential flow meter can be formed by attaching a flow scale to this gauge. However, since the flow indication is a square root scale reading is difficult. Moreover, incase of remote transmission it is inconvenient because the evolution operation is performed to obtain linear relation.
Therefore if a by-pass pipe connecting the before and behind point of the main orifice is installed and the flow is branched to that pipe to overcome these disadvantage, that flow becomes proportional to the differential

Installation example when flower meter using orifice ring in horizontal piping

Ori - Flow Meter

Ori Flow Rotameter

Capacity guide maximum m³/h of water

Ori Flow Rotameter

Flow value indicates the maximum flow range which can be measured when water (sp. gravity : 1.0, Viscosity : 1 Cp) is the standard.
However minimum flow value for diameter ratio m : 0.3
maximum flow value for diameter ratio m : 0.7

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