Positive Displacement Meter - Selection Criteria

ORDERING WORKSHEET
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PURCHASE SPECIFICATIONS
Meter shall be of the positive displacement design having rotary motion without axial thrust or flow impingement. No eccentric, sliding, reciprocating or oscillating parts to induce excess liquid shear or liquid compressibility within the meter element. Rotary parts to be horizontally supported on both sides by solid support bearings and rotor journals of materials compatible with product to be metered. No ball bearings, springs or cams.

Rotary drive and meter adjustment output to all mechanical readout shall be non-cyclic without pulsation and capable of infinite meter accuracy adjustment of 0.02% or better. Meter calibration adjustment device must be externally accessible not requiring removal of any readout equipment for calibration or replacement.

Steel dual case meters to have readily removable inner elements, packing gland drives, and adjusters without necessity of removing any ancillary readout equipment. Meter measuring element shall have a minimum braking torque and shall immediately respond to product low-flow movement.