Positive Displacement Flow Meters From Nagman Flow

Positive Displacement flow meters are the best flow measuring equipment to openly measure the volume of fluid that travels through the flow meter. It attains this by trapping pockets of fluid amongst rotating components housed inside a high precision chamber. This can be associated to recurrently filling a beaker with fluid and pouring the contents downstream while calculating the number of times the beaker is filled. Rotor rotational velocity is directly related to flow rate since the flow of fluid is instigating the rotation.

 

 In the case of electro magnetic flow meters, the rotating components involve magnets that trigger numerous sensor options located exterior to the fluid chamber. Mechanical positive shift flow sensors rely on the rotation to drive either a magnetic coupling or a direct gear train related to the mechanical counter.

 

 Positive Displacement flow meters do not gratify a power supply for their operation and do not need straight upstream and downstream pipe runs for their setting up. Positive displacement flow meters are obtainable in sizes from in to 12 in and can function with turndowns as great as 100:1, although ranges of 15:1 or lower are much more communal. The slippage between the flow meter constituents is reduced and metering precision is consequently increased as the thickness of the process fluid increases.

 

 The process fluid must be spotless. Particles greater than 100 microns in size must be detached by filtering. PD meters work with small clearances amid their precision-machined parts which worn out speedily and rescind their accuracy. For this reason, Positive Displacement flow meters are generally not suggested for measuring slurries or coarse fluids. In fresh fluid services, nevertheless, their precision and wide rangeability make them perfect for custody transfer and group charging. They are most extensively used as household water meters. Millions of such units are formed annually. In industrial and petrochemical applications, Positive displacement flow sensors are normally used for batch charging of both liquids and gases.

 

 While slippage through the positive displacement flow meters declines that is, correctness increases as fluid viscosity increases, the pressure drop through the meter also increases. Subsequently, the maximum and minimum flow capacity of the flow meter is reduced as viscosity surges. The greater the viscosity, the less slippage and the lesser the measurable flow rate becomes.