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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 graduations
  • Range: 0-5 GPM; 0-10 GPM; 0-20 GPM; 0-40 GPM; 0-80 GPM
  • Accuracy: ± 2% F.S.
  • Repeatibility: ± 1%
  • Special scales available
  • High and Low Alarms – OPTIONAL
  • Insensitive to shock and vibration
  • One year limited warranty

MAG/RF Pickup
A pickup device is a transducer (specifically a variable reluctance sensor) that captures or senses mechanical vibrations .....

Premium Magnetic Pickups
These pickups are suited for harsh environments and years of reliable service. They are hermetically sealed for resistance to moisture and other atmospheric contamination and can withstand repeated thermocycling in temperatures ranging from -450°F to 450°F. These pickups are also being used in cryogenics for their ability to operate dependably at extremely low temperatures for long periods of time.
Features like glass sealed connectors, unique internal potting, and high quality magnets that resist demagnetization, make these pickups the best choice for demanding environments.
These pickups are available in standard and ruggedized grades. Ruggedized pickups undergo a internal construction process that enables them to better tolerate rigorous conditions that would cause other pickups to fail (e.g. excessive vibrations, impact and repeated thermocycling). 

Standard Features and Specifications
Variable reluctance or inductive type

Hermetically sealed, heli-arc welded construction
2 pin, gold plated, glass sealed connector (mate:MS3106-10SL-4P)
300 stainless steel housing (locknut included)
Magnet that resists demagnetization
Unique potting that compensates for temperature extremes
Temperature range -450°F to 450°F (-270°C to 232°C)
IR leakage: 100 megaohms @ 100 Vdc minimum
High signal output
High shock and vibration resistance(impact: 25G’s min.; vibration: 2G’s at 2000 Hz min.)

Humbucking Magnetic Pickups
Intrinsically Safe Magnetic Pickups
High Temperature Magnetic Pickups
Modulated Carrier (RF) Pickups
Intrinsically Safe (RF) Pickups
High Temperature RF Pickups (RF) Pickups
Digi-Pulse Magnetic and RF Pickups
Intrinsically Safe Digi-Pulse Pickups
Pickups with RTD, Magnetic and RF
All Pickups Catalog


Ratemeters & Totalizers

Data acquisition is the process of sampling signals that measure real world physical conditions and converting the resulting samples into digital numeric values that can be manipulated by a computer. Data acquisition systems, abbreviated by the acronyms DAS or DAQ, typically convert analog waveforms into digital values for processing. The components of data acquisition systems include:

  • Sensors, to convert physical parameters to electrical signals.
  • Signal conditioning circuitry, to convert sensor signals into a form that can be converted to digital values.
  • Analog-to-digital converters, to convert conditioned sensor signals to digital values..

912-MRT  Features

• Separate Scaling Factors For A & B Inputs
• Display Rate & Total
• Pulse Input - 10 kHz Max.
• RS422/RS232 Serial Communication (optional)
• Modbus RTU RS422/RS485/RS232 (optional)
• NEMA 4X / IP65 Front Panel
• Separate Add/Subtract Simultaneous Inputs
• Quadrature and Up/Down Direction Control Inputs (optional)
• 30mV Magnetic Pickup Inputs (optional)

Any rate, total or blending application where 2 preset alarms and scaling are required.


HyperLink Batch Controllers

923-ST1 Features:

    EZSetup”Guided Setup for First Time Users
    Rate/Total and Batching Functions
    Menu Selectable Hardware & Software Features
    Environmental Compliance Monitoring and Report Generation
    Universal Viscosity Curve (UVC) and API Eq.
    Advanced Batching Features : Overrun Compensation, Auto batch Start,     PrintEnd of Batch, Slow Fill, 2  
        Stage Batching

    Isolated Outputs Standard
    RS-232PortStandard,RS-485 Optional
    Advanced Printing Capabilities
    Windows™Setup Software

The 923-ST1 Flow Computer satisfies the instrumentrequirements for a variety of flow meter types in liquid applications. Multiple flow equations and instrument functions are available in a single unit with many advanced features.  

Flow Meters and Computations:
Meter Types: All linear and square law meters supported including: vortex, turbine, magnetic, PD, target, orifice, venturi, v-cone and many others
Linearization: Square root, 16 point table or UVC table.
Computations: Volume, Corrected Volume & Mass
Fluid Computations: Temperature, Density, Viscosity and API 2540 for petroleum

HyperLink Flow Computers

Instrument Verification Set (P/N:101199-100) :
Instrument Verification Set (IVS) is a portable instrument verification and diagnostic measuring tool designed to verify flow, pressure and temeprature of hydraulic systems and instruments. 

  •  Flow rate is measured by turbine flow meter, an effective and reliable flow measuring technology.
  •  Temprature sensor is Microprcessor based with rugged, currosion-resistant 316L stainless steel housing .
  • Pressure transducer is based on a robust and long-life thin-film sensor.
  • IVS is certified and traceable to NIST.
Flow Rate 0 to 80 GPM w/ accuracy +/- 0.50% FS
Pressure Low Range 0 to 500 PSI w/ accuracy +/- 0.25% FS
Pressure High Range 0 to 6000 PSI w/ accuracy +/- 0.25% FS
Temprature -13°F to 257°F w/ accuracy +/- 1.5% FS

923-ST1 Flow Computer

  • The 923-ST1 “EZ-Setup” guided setup for first time users
  • Rate/total and batching functions
  • Menu selectable hardware & software features
  • Environmental compliance monitoring and report generation
  • Universal Viscosity Curve (UVC) and API Equations
  • Advanced batching features: Overrun comp. autobatch start, print end, slow fill, 2-stage batching
  • Isolated outputs standard
  • RS-232 port standard, RS-485 optional advanced printing capabilities
  • DIN Enclosure with two-piece connectors
  • On-board data logging
  • DDE server & HM software available
  • Enhanced modem features for remote metering
  • Wall mount enclosure.

924-ST2 Flow Computer
925-ES747 Flow Computer
926-ST1LE Flow Computer

HyperLink Field Indicators

Accepts inputs from Magnetic Pickups, Contact Closures, DC Pulses
Optically Isolated from Pulse Producing Flow Meters
Displays Rate & Total Simultaneously, 5 Digit Rate Display, 8 Digit Totalizer Display
Powered From Internal Battery, External DC Supply or 4-20 mA Output Loop
20 Point Linearization (optional)
Isolated Scaled Pulse Output
RS485 Modbus RTU Communications and Data Logger (optional)


Field Indicators Tutorial
Field indicators are signal conditioner/converter devices with a display. Field Indicators are intended for mounting on or near the flow sensor. They perform many of the same roles of signal conditioner/converters plus that of providing a convenient local display.
Many “smart” Field Indicators provide additional, advanced functionality such as sensor linearization.
Field Indicators are ancillary display devices also intended to amplify, filter, condition, scale, and convert the low level “raw” signals produced by many transducers and convert it into the desired, industry standard high level signal before transmitting it across a potentially noisy environment. Display indication is also provided. In some cases, a secondary function is providing signal isolation.....

HyperLink Signal Conditioners

2-Wire Frequency to Current Signal Conditioner

Magnetic Pickup or Contact Closure Input
Optically Isolated Input
10 kHz Maximum Input Frequency
Standard, 2-Wire, 4-20 mA Output
Two Year Warranty
Loop Powered
Various Mounting Styles
LED Indicator

The SC-FI is a two wire frequency to analog converter that converts a pulse rate input into a 4-20 mA output signal proportional to frequency or rate.

The input pulse rate is amplified and filtered by the input signal conditioning circuitry. Two forms of input signal conditioning are provided, one for magnetic pickups or contact closure inputs and the other is an isolated pulse input (depending on order code).

The amplified frequency signal is then converted to an analog signal using a precision frequency to analog converter.

The output stage derives it’s power from the output current loop.

The output stage converts the analog input signal into the desired output range. Multi-turn potentiometers provide for the necessary trimming of span and zero.

2-Wire Current to Current Loop Powered Isolator
2-Wire Current to Frequency Signal Conditioner
2-Wire Frequency to Frequency Pulse Isolator and Scalar
Signal Conditioners and Converters
115/230 SERIES
Cased Power Supplies.



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