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1/2" to 4" Multivariable Vortex Mass Flow Meter.

Regular price $3,100.00 Sale


Vortex Mass Flow Meters at the prices of high end Thermal Mass Flow Meters and are at 1% of READING.

Vortex Meter Digital Display

Multivariable Vortex Meter

See the video below to see how to use the buttons on the display within the enclosure. 

Features LARGE LCD display, shows the Flow Rate, Total Flow, Temperature, and Pressure in user selectable units.

Vortex Manual

 Vortex Meter Specifications.

  • Wetted Materials all 304 SS 
  • Velocity Range: See detail below.
  • Velocity Accuracy: +/- 1% of reading
  • Repeatability of +/- 0.05% of reading
  • 1/2" to 4" 150# ANSI Flange Connections, up to 12" available custom.
  • LCD Display
  • Temperature Accuracy +/- 1 Deg C
  • Temperature:         
    • Gas: -40°F (-40°C) to 482°F (250°C)
    • Std Temp Liquid: -40°F (-40°C) to 662°F (350°C)
    • High Temp Liquid: -40°F (-40°C) to 626°F (330°C)[Add $450]
    • Ambient: -40°F (-40°C) to 131°F (55°C)              
  • Power Requirement: 24 VDC, 15 Watts maximum;   
  • 3.6 VDC Lithium C Size battery for intrinsic safety mode. Has LCD Display but no 4-20 or ModBus
  • Output signals: Modbus RTU, 4–20 mA, and 0-1.0 KHz for flow rate indication
  • Digital communications: Modbus RTU
  • Max Pressure 1.6 MPa, 230 PSIG. (Custom up to 4.0 MPa 580 PSIG)
  • Display: Flow rate, Total flow, Temperature, and Pressure
  • Wiring connection to enclosure size: M20 x 1.5
  • Factory Final QC Test Certificate
  • Integral Electronics
  • Electronics Enclosure NEMA 4X / IP67

Vortex Meter Velocity Ranges:

The Vortex meter has different minimum and maximum flow velocities it can measure based on the fluid type and meter size. Please note the values below for proper sizing of your meter. 

  • Steam:
1/2” ANSI Flange: 4-70m/s or 787-13,800 f/m  or 13-230 f/s
1” ANSI Flange: 3-70m/s or  590- 13,800 f/m  or 9.8-230 f/s
2” to 12” ANSI Flange: 1.5-70m/s  or 30.2-13,800 f/m  or 4.92-230 f/s
  • Gas: 
1/2” ANSI Flange: 4-65m/s  or 787-12,790 f/m  or 13- 213 f/s
 1” ANSI Flange: 3-65m/s  or 590-12, 790 f/m  or 9.8- 213 f/s
2” to 12” ANSI Flange: 1.5-65m/s or 300- 12,790 f/m  or 4.9-213 f/s
  • Liquid: 
1/2” to 12” ANSI Flange: 0.2-10m/s  or 40- 1,968 f/m  or .66-32.8 f/s

Nominal Vortex Flow Rates for Air

The table below gives the minimum, nominal, and maximum velocities for the Vortex Meter for gases to assist users familiar with Thermal Mass Flow Meter sizing guides relative to air, with a density of 0.075 lb/ft^3 for reference. As the pressure goes up the flows go up as well. For example, if the pressure is DOUBLED, so too does the mass flow. Download chart below here:

Vortex Flow Rate Chart Tactical Flow Meter

 IMPORTANT Note to Thermal Mass Flow Meter users...

Did you know that Multivariable Vortex Flow Meters offer a significant advantage over Thermal Mass Flow Meters when it is not necessary to measure ultra low or ultra high flows?

Did you know that a Multivariable Vortex Meter is not affected by gas composition? This means you can change gas composition and STILL report the proper Mass Flow! Why utilize a Gas Chromatograph to determine gas composition to correct your Thermal Mass Flow Meter measurement? If you need ultra low flows it makes sense but if your minimum flows are within the measuring range of a Vortex meter then consider a Multivariable Vortex Mass Flow Meter.

As well, it is important to note that Thermal Mass Flow Meters are quite sensitive to moisture in the flow stream. The most common undesirable effect is momentary flow spikes that can upset your control system. Vortex Meters, on the other hand are NOT sensitive to moisture in the flow stream and offer a significant advantage over Thermal Mass Flow Meters if such spikes are determined to be undesirable.

Have you ever have problems with temperature swings causing your Thermal Mass Flow meter to over or under report the flow measurement? The Multivariable Vortex Mass Flow Meter does not exhibit these symptoms simply because the vortex shedding velocity is not a function of temperature or pressure. And, with the Multivariable Vortex Meters built in Pressure and Temperature sensors you can get true Mass Flow, Pressure, AND Temperature and even gather Volume flow on those rare occasions when deemed necessary. And, you have a true pressure measurement as well as the Mass Flow and temperature. All at a price very competitive with Thermal Mass Flow Meters.

HOWEVER, if you DO need very low or very high flows we suggest the use of Thermal Mass Flow Meters. As well, Thermal Mass Flow Meters are ideal as "Insertion Meters" as they are small and if, and ONLY if, there is no moisture, or gas composition changes then the Thermal Mass Flow Meter is a very good choice.  Otherwise, the Vortex is the best choice as it has NO sensitivity to the gas composition or droplets or hydrocarbon particulate.

Refer to the chart above for the minimum and maximum flows for the Vortex Mass Flow Meter. Refer to the minimum and maximum velocities for the fluid you wish to use to see if a vortex meter is a good choice. If your flow is within the velocity range of the Vortex meter AND you have moisture or any change in gas composition then a Vortex meter is a better choice over the Thermal Mass Flow Meter.

Vortex Multivariable Flange Meter Dimensions with 150# ANSI B 16.5 Flanges

Multivariable Vortex Meter Dimensions, TacticalFlowMeter.com

Vortex Meter Specifications and Dimensions:
Download Brochure
 , Specifications, Cut Sheet, and Dimensions..

Important Note: Vortex Flow Meters want to be rigidly mounted or isolated from vibration to prevent the vibrating energy to be transmitted to the Vortex Piezo Sensors. This can be accomplished by rigid mounts to a solid base or good vibration isolation.

How to use button interface and ModBus RTU video:To get the most out of the video open the link below and print out the document or open it in another window.

ModBus commands and Meter codes

Vortex Manual

How to Invoke Variable K-Factors in the Tactical Flow Meter Vortex Flow Meter:

Screen 33 Instructions are for advanced users only. Do NOT invoke this screen on your meter unless you have a pressing need. It is important to note all settings PRIOR to making any changes. Note: Left button HOLD gets you OUT of menus.

See example spreadsheet here

Video showing how to use the spreadsheet above and the Front Panel Interface with Menu 33:

Before exiting ensure you SAVE the data and CONFIRM the % numbers are ever increasing in from element 0 to element 4. The Correction ratio must be between 0.8 and 1.2.

 Where to get Power Supplies, Gaskets, Nuts and Bolts Link

Important Note: Vortex Flow Meters want to be rigidly mounted or isolated from vibration to prevent the vibrating energy to be transmitted to the Vortex Piezo Sensors. This can be accomplished by rigid mounts to a solid base or good vibration isolation. We show some settings below as examples for your study. The video above shows how to enter the configuration modes.

Typical Vortex Meter Settings for reading Volume Flow for Liquids with a Full Scale of 250 l/m for a fluid with a density of 875 kg/m3 for a 3" Vortex Meter where the vortex frequency is from 34-850 Hz.


Q Unit >> l/m
Q Mode >> Qvw actual (We are measuring volume flow....)
Q Factor >> 2121.47  Do Not Change (This is stamped on the side of the meter)
Density >> 875 kg/m3 (Water is 1000)
Q20mA >> 250 (FULL SCALE... If your meter is 250 l/m)
Q Cut-Zero % >> 5
Q Up Al >> 250 to turn the alarm on at 100%
Q Dn Al >> 25 to turn the alarm at 10% flow
Damp S >> 6
Comm Address >> 0
Clear Q >> Clears Totalizer, Password = 70

Language >> English
Pulse Type >> F_adj
Pulse Factor >> 0.01
Comm Param >> 9600, No
Comm Switch >> ON
P_display >> MEASURE
Set Pc >> 0
P0-Ref >> 101.3KPa
T_display >> MEASURE
Set Tc >> 20 Deg C
T-TYPE >> Pt=100
Tn >> 20 Deg C
Environ-T >> -20 Deg C (-10 C is fine if you do not get them cold.)
Q-adj >> DO NOT change this setting

Signal-TYPE >> LF: DN40-500 Lqd
Gain >> G=9
VPP limit >> 100mV
Fre-Range >> 11=34-850Hz
Work Type >> Digital
an-noise TYPE >> ANS
Signal-Adj-Set >> FIlter 10 or OFF
50Hz Cut >> ON
K-LINE ADJ >> DO NOT change this setting