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Flow Meter/Flow measurement

Flow measurement is the quantification of bulk fluid movement. Flow can be measured in a variety of ways.
Positive-displacement flow meters accumulate a fixed volume of fluid and then count the number of times the volume is filled to measure flow.
Other flow measurement methods rely on forces produced by the flowing stream as it overcomes a known constriction, to indirectly calculate flow. Flow may be measured by measuring the velocity of fluid over a known area.

The Role of Control Systems In The Gas And Oil Industries
Control is an essential element in the industries which operate within the surveillance for, and extraction of fossil fuels.
As technologies advance, we are offered an increasing armory in ways to solve engineering problems and create more accurate and efficient processes at the same time. But with more extreme demands being placed on equipment in the gas and oil industries and an increasing need for durability and reliability, support equipment in these industrial control systems becomes more pivotal to ensuring the smooth-running of these procedures.

  • Capturing Accuracy
  • The Role of The Signal Controller
  • Conversion and Enhancement of a Data Stream
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Leading with Quality, Performance and Cost
Our partners, the Flowmetrics Inc. is a leading manufacturer of flow meters and associated flow computers.
Specifically, we provide in-line and insertion flow meters :

  • Turbine flow meters
  • Variable area flow meters (rotameter)
  • Positive displacement flow meters
  • MAG/RF pickups
  • Ratemeters
  • Totalizers
  • Batch controllers
  • Flow computers
  • Field indicators
  • Signal conditioners
Our turbine flow meters are available in sizes from 1/2" to 12" and are capable of measuring liquid flow rates from .001 to 15,000 GPM and gas flow rates from .005 to 15,000 ACFM.
For more than 35 years, Flowmetrics has been recognized for superior flow measuring products/services and specialized fluid flow systems.
Flowmetrics has on-site testing and calibration laboratories for flow meters to service any type or brand of flow meter.

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Turbine Flow Meter

  • Aerospace and Automobile fuel consumptions
  • Natural Gas in industrial applications
  • Hydraulics
  • High-temperature, High-pressure, and High Shock
  • Ultra-pure water in pharmaceuticals
  • Petrochemicals
  • Batching, Mixing, and Hygenic
  • Custody transfer
  • Cryogenics


  • Exceptionally reliable digital outputs.
  • Used for a variety of liquid and gas flow sensing applications
  • Sizes availble for 1/2 inch to 12 inches
  • Offers high turn-down with minimum uncertainty and very repeatable output
  • Ideal for fluids with viscosities of 500 cst or less for 2 inch and larger flowmeters
  • Ideal for fluids with viscosities of 200 cst for smaller than 2 inch flowmeters.
  • Quick response time, Low rotor inertia
  •  Suitable for measuring fluctuating flows
  • Requires digital readout for pulsating flows.

The Flowmetrics Tangential turbine flowmeter is a unique volumetric device.
This uses a dual orifice design to direct a stream of fluid tangent
to a low mass/balanced rotor and a precision bearing to provide maximum sensitivity.

  •  Exceptionally reliable digital outputs.
  • Used for a variety of liquid and gas flow sensing applications.
  • Well suited to meet a variety of process media.
  • Capable of measuring extremely low flow rates(.001 GPM liquids and .001 ACFM in gases).
  • High output and low drag magnetic pickoffs.
  • Zero drag modulated carrier pickoffs.
  • Bearing to suit specialized applications.
  • NIST traceable calibration. 

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) 


  • HOUSING: Ductile Iron (Nickel Plated)
  • COVER: 304 Stainless Steel
  • GEAR: 416 Stainless Steel
  • PICKUP SENSOR: 303 Stainless Steel Housing with Solid Epoxy Encapsulation
  • BEARING: 440C Stainless Steel .

The force of the liquid moving through the flow meter drives the measuring gears. The liquid stream is divided into the fixed volume cavities between the gear teeth and 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.


Variable Area Flow Meter
A rotameter is a device that measures the flow rate of fluid in a closed tube.
It belongs to a class of meters called variable area meters, which measure flow rate by allowing the cross-sectional area the fluid travels through, to vary, causing a measurable effect.[1]

  • A rotameter requires no external power or fuel, it uses only the inherent properties of the fluid, along with gravity, to measure flow rate.
  • A rotameter is also a relatively simple device that can be mass manufactured out of cheap materials, allowing for its widespread use.
  • Since the area of the flow passage increases as the float moves up the tube, the scale is approximately linear.[1]
  • Clear glass is used which is highly resistant to thermal shock and chemical action.


  • Due to its reliance on the ability of the fluid or gas to displace the float, graduations on a given rotameter will only be accurate for a given substance at a given temperature. The main property of importance is the density of the fluid; however, viscosity may also be significant. Floats are ideally designed to be insensitive to viscosity; however, this is seldom verifiable from manufacturers' specifications. Either separate rotameters for different densities and viscosities may be used, or multiple scales on the same rotameter can be used.
  • Due to the direct flow indication the resolution is relatively poor compared to other measurement principles. Readout uncertainty gets worse near the bottom of the scale. Oscillations of the float and parallax may further increase the uncertainty of the measurement.
  • Since the float must be read through the flowing medium, some fluids may obscure the reading. A transducer may be required for electronically measuring the position of the float.
  • Rotameters are not easily adapted for reading by machine; although magnetic floats that drive a follower outside the tube are available.
  • Rotameters are not generally manufactured in sizes greater than 6 inches/150 mm, but bypass designs are sometimes used on very large pipes.[1]

The Flowmetrics 2000 Series Variable Area Flow Meter is a rugged industrial Flow Meter available in a wide range of liquid and gas flow rates. 

The Flowmetrics 600 mm Single Flow Metering panel offers the highest precision available in our product line. Each meter is provided with a direct-reading, custom-engraved scale mounted adjacent to the metering tube. Flowmetrics’ scales are generated from data obtained in calibrations using fluid which simulates as closely as possible the customer’s process.

The Flowmetrics 600 mm Multi-Stage Flow Metering panel offers the highest precision available in our product line of variable area Flow Meters. Each meter is provided with a direct-reading, custom engraved scale mounted adjacent to the metering tube. Flowmetrics’ scales are generated from data obtained in calibrations using fluid which simulates as closely as possible the customer’s process. 

Flowmetric’s in-line Flow Meter is simple to install and can be installed directly into horizontal or vertical lines.

  • Stainless steel or aluminum meter
  • Seals: Viton, Buna, Teflon, Neoprene, or EPR
  • Pressure rating: 5,000 psi maximum
  • Temperature rating: 240°F maximum
  • Standard scale: GPM