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Model 500 Nutating Disc Flow Meter
Though originally designed for flood water flow monitoring applications, the Model 500, a rugged, moderately priced, positive displacement flow meter, has gained a solid reputation for reliable service in a growing range of rigorous industrial class operations, where positive displacement flow monitoring is desired.
Model 500 Nutating Disc Flow Meter
Specifications
Material of Construction: External Housing is a two-part bronze body casting.
Internally, the nutating disc mechanism includes a fiberglass-filled Ryton® measuring chamber and wobble plate assembly (composed of graphite impregnated Neoprene of extremely high durameter).
Registration: 7 Digit Display with Test Pointer
Flow Range: 103-635 BPD (42 Gal. Bbl)
3-20 GPM (U.S. Gal's)
16-109 (Cu. Meters)
Accuracy: ±2% of Reading
Pressure Rating: 2000 PSI Operating Pressure Max.
Operating Temperature: -32° F. to +200° F.
Connections: 1.25" Straight External Pipe Thread  (1" NPT optional)
Overall Dimensions: 7.75" Length x 5.5" Width x Width 8.25" Height
Weight: Approximately 21 lbs.
Operating Principle

Fluid entering the flow meter passes through the inlet port of the cylindrically-shaped measurement chamber (1), filling the chamber directly below the diagonally-mounted nutating disc. This action causes the disc to wobble (or nutate) in a counterclockwise direction (2), causing the spindle shaft, located on the ball-shaped pivot, to rotate against the vertical magnetic shaft. This rotating action is transmitted through the magnetic drive assembly to the mechanical register (or pulse register). This measurement chamber actually contains two alternating positive displacement compartments of equal capacity. On each rotational cycle of  the nutating disc, one compartment is being filled (expanding capacity) while the other is discharging fluid (contracting capacity), providing a steady, continuous flow.

 
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