1.Nutating Disc
Principle of Operation:
Liquid enters a precision-machined chamber containing a disc which nutates (wobbles).The position of the disc divides the chamber into compartments containing an exact volume. Liquid pressure drives the disc to wobble and a roller cam causes the nutating disc to make a complete cycle. The compartments are filled and emptied each cycle.The movements of the disc are transmitted by a gear train to a register/totalizer or pulse transmitter. Close clearances between the disc and chamber ensure minimum leakage for accurate and repeatable measurement of each volume cycle.
Features:
Cost Effective
- Eliminates upstream and downstream straight run piping
requirements
- Power not required for mechanical version
Rugged, Reliable Design
- Tolerant of foreign particles
Saves Space
- Very compact size
Specifications:
Line Sizes:3/4" to 4" (20mm to 101.6mm);
Operating Pressure:up to 5,000 psig (345 bar);
Operating:from 32° to 400°F (0° to 204°C);
Repeatability:± 0.25% of rate;
Accuracy:± 1.5% of rate;
Flow Turndown Ratio:up to 20:1;
Flow Range:0.2 gpm to 400 gpm (0.8 l/min to 1,514.2 l/min);
Power Required: none for mechanical versions;
2.Oscillating PistonPrinciple of Operation:
Liquid enters a precision-machined chamber containing an oscillating (rotating) piston. The position of the piston divides the chamber into compartments containing an exact volume. Liquid pressure drives the piston to oscillate and rotate its center hub. The movements of the hub are sensed through the metecover by a follower magnet. Each revolution of the piston hub is equivalent to a fixed volume of fluid, which is indicated as flow by a register/totalizer. Close clearances between the piston and the chamber ensure minimum liquid slip for highly accurate and repeatable measurement of each volume cycle.
Features:
Accuracy
±0.5% of rate
Cost Effective
- Eliminates upstream and downstream straight run piping
requirements
- Power not required for mechanical version
Versatile Design and Construction
- Standard 316 SS/ETFE allows user flexibility with different fluids
Registers/Transmitters:
These Niagara registers are compatible with Positive Displacement flowmeters only.
Pulse Transmitters
Mechanical Totalizing Registers
Batch Totalizer Registers |
