Vega-sonic VS-12

High-tech ultrasonic flow meter of flare, associated petroleum and natural gas of mortise and coil design

Main features:

  • The version for installation on an existing pipeline by the method of "hot" or "cold" tapping, as well as the version with a measuring pipeline (IT)
  • The ability to extract sensors without stopping the technological process through the extraction mechanism of the stuffing box type
  • The use of special sensors with minimal protrusion into the pipe body to exclude the possibility of damage by mechanical impurities
  • Reduction of the flow rate to SU according to GSSSD MR113 for APG and according to GOST 30319.2 for natural gas without using an external flow corrector
  • Measurement of the molecular weight of HCG in the range of 2...160 g/mol
  • ⁠⁠Measurement of HCG mass flow
Execution of commands Universal Command Specification HCF_SPEC-127 (revision 7.1) of the HART protocol version 7.6. Testing using the HART FrameAnalyst utility
Execution of commands Universal Command Specification HCF_SPEC-127 (revision 7.1) of the HART protocol version 7.6. Testing using the HART FrameAnalyst utility
Interface with the FDT/DTM DCS module and transfer of four variables via the HART protocol (version 7.6) using the example of the PACTware software package (developed by Schneider Electric)


Vega-Sonic VS-12 ultrasonic flow meter is a complete ultrasonic gas flow rate metering systems for the following main applications:

  • Measurement of mass flow rate and molecular weight of hydrocarbon gases (HCG) and HCG blends in petrochemical plants
  • Flare gas flow measurement
  • Flow rate measurement of associated (casing head) petroleum gas as a part of a gas metering system


Accurate measurement of gas flow rate within the flow velocity range from 0.03 to 100 m/s

Hot-tap or weld-in insertion sensors, as well as in-line flow meters

Standard or high-capacity transducers for a wide range of applications

Verification via simulation is possible, including the verification without dismounting the device from the pipeline

Automatic or manual correction of HCG molecular weight calculation with adjustment for nitrogen content

Reduction of volumetric gas flow rate to standard conditions as per GSSSD MR 113 or GOST 30319. 2

Calculation of mass flow rate, molecular weight and density of hydrocarbon gases (HCG) and HCG blends within the range 2 to 160 g/mol 

Ultrasonic transducers can be removed through a dedicated extraction gland mechanism (lubricator) without stopping the process


Velocity measurement range, m/s  0,03 to 100

Outside diameter of sensing pipe (D), mm

80 to 1650
Maximal number of channels  2
Fluid temperature, °С -220* to 260
Fluid pressure range, MPa (absolute) 0,087-24
Limits of admissible fractional error for measurements of velocity, volumetric flow rate, volume (within the velocity measurement range), %
1 channel version, for the velocity range:
(0,05≤V<0,1 m/s)
(0,1≤V<0,3 m/s)
(0,3≤V≤100 m/s)
channel version, for the velocity range:
(0,05≤V<0,1 m/s)
(0,1≤V<0,3 m/s)
(0,3≤V≤100 m/s)
Calculation range for molecular weights of HCG and HCG blends, g/mol 2 to 160
Environment temperature, °С  -50 to 60
Output signals:                                                                                                                             

3х analogue (4–20 mA); 2х pulse, frequency, discrete

Digital communication interfaces  RS232, Modbus RS485, HART
AC Voltage 
DC voltage
187…242 V (50±2 Hz)
18 to 36 V
Protection of electronic calculation unit as per GOST 14254-96 IP66



Sensors' material

  • standard: 12Х18Н10Т optional: Titanium VT1-0

Electronic calculation unit housing material

  • standard: epoxy coated aluminum IP66 optional: stainless steel


  • two-line graphic OLED-display
  • menu in Russian and English

Certificate ТР ТС 012/2011

  • ТС RU C-RU.АА87.В.01050

Certificate ТР ТС 020/2011

  • RU Д-RU.АЗ01.В.05701

Certificate ТР ТС 032/2013

  • ТС RU C-RU.АЖ10.В.00004

Pattern Approval Certificate of Measuring Instruments

  • Registration number in the National Register of Measuring Instruments: 68468-17
  • Calibration interval 4 years
  • Accuracy of simulation method of calibration is the same as with wet calibration

Measured parameters

  • volumetric flow rate under operating conditions
  • sound velocity and flow velocity

Calculation parameters

  • volumetric flow rate reduced to standard conditions as per GSSSD MR 113 or GOST 30319. 2
  • molecular weight of HCG (hydrocarbon gases) and HCG blends
  • HCG mass flow rate

Inputs and Outputs (depends on version)

  • 3 isolated analogue outputs 4–20 мА, 2 pulse-frequency outputs 0–10 KHz, Modbus RS-485, HART, RS-232
  • 3 inputs 4–20 mA with integrated power source 24 VDC to connect pressure, temperature and nitrogen sensors 

Data logging (internal)

  • one-hour for 1488 hours (62 days);

  • two-hour for 2976 hours (124 days);

  • 24-hour for 186 days (6 months);

  • monthly for 120 months (10 years)


Manuals are available on request

  • Guide to measuring P and L
  • The recommended form of the act of measurements P and L
  • Guide to measuring the pipeline
  • Recommended form of pipeline measurement report
  • Pipe Installation guide
  • Installation guide "hot" inset
  • Installation guide "cold" inset
  • Verification procedure

Опросный лист

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