ORI-FLOW METER

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 & THE FLOW Q HAVE SHOWN IN EQUATION GIVEN BELOW. THE FLOW IS PROPORTIONAL TO SQUARE ROOT OF THE DIFFERENTIAL PRESSURE.

Q=CF [2g/ץ(P1-P2)]^1/2 

Q :VOLUMETRIC FLOW ,
C :FLOW CO-EFFICIENT   
F :CROSS SECTIONAL AREA OF ORIFICE HOLE    
g :ACCELERATIONION OF GRAVITY                    
P1-P2 :DIFFERENTIAL PRESSURE                       
ץ : SPECIFIC WEIGHT OF FLUID.

THE GENERATED DIFFERENTIAL PRESSURE IS SENT TO THE MANOMETER OR OTHER DIFFERENTIAL PRESSURE GAUGE & A DIFFERENTIAL FLOW METER   CAN BE FORMED BY ATTACHING A FLOW SCALE TO THIS GAUGE. HOWEVER,SINCE  FLOW INDICATION  IS SQUARE ROOT SCALE READING IS DIFFICULT.   MOREOVER, INCASE OF REMOTE TRANSMISSION IT IS INCONVENIENT BECAUSE THE EVOLUTION  OPERATION IS PERFORMED TO OBTAIN LINEAR RELARION. 

THEREFORE IF A BYPASS PIPE CONNECTING BEFORE AND  BEHIND POINT OF THE MAIN ORIFICE IS INSTALLED AND THE FLOW IS BRANCHED TO THAT PIPE TO OVERCOME THESE DISADVENTAGE, THAT FLOW BECOMES PROPORTIONAL TO THE DIFFERENTIAL.