Positive Displacement Flow Meters
PRINCIPLES OF OPERATION IN THE POSITIVE DISPLACEMENT FLOW METER
The force of the liquid moving through the positive displacement in the flow meter drives the measuring gears. The liquid stream is divided into the fixed-volume cavities between the gear teeth and the metering body.
The movement of gear is measured by means of a pick-up sensor located in the cover. When the measuring gears rotate by one tooth pitch, the sensor emits a signal/frequency, which corresponds to the geometrical tooth volume. The signal is converted into a square wave pulse by the pre-amplifier.
The pulse or frequency output are processed by secondary instruments ranging from a basic signal conditioner, indicator/totalizer to more complex flow computers, which compensate temperature, pressure, density, viscosity and provide accurate volumetric or mass flow measurement.
SPECIFICATIONS OF THE POSITIVE DISPLACEMENT FLOW METER
- Maximum operating pressure: 6000 psi
- Available sizes from 1/4″ to 1-1/2″
- Temperature Limits: -40°F to 400°F (-40°C to 204°C)
- Flow Range: .01 -110 GPM
- Accuracy: +/- .05% of Reading
APPLICATIONS OF THE POSITIVE DISPLACEMENT FLOW METER
- Hydraulic Test Stands (Low Viscosity)
- Aerospace and Automotive (Low to Medium Viscosity)
- Batching and Mixing (Medium Viscosity)
- Petrochemical (Medium to High Viscosity)
- Lubrication Oil Blending (High Viscosity)
CONSTRUCTIONS OF THE POSITIVE DISPLACEMENT FLOW METER
- HOUSING: 304 Stainless Steel
- COVER: 304 Stainless Steel
- GEAR: 416 Stainless Steel
- PICKUP SENSOR: 303 Stainless Steel Housing with Solid Epoxy Encapsulation
- MATING CONNECTOR: MS 3102A-10SL
- BEARING: 440C Stainless Steel