SONATEC is a highly precise sound velocity sensor for determination of sound velocities and concentrations (e. g. of oils, fuels, acids or caustics). The sensor can be used for instance for phase detection.


The sound velocity sensor SONATEC continuously measures the velocity of sound through liquids. The instrument is designed for applications requiring maximum sensitivity and highest accuracy. It is easy to operate and maintenance-free. For sound velocity measurement a sound pulse is created by a piezo-element in a sonic transmitter. It moves perpendicular to the product flow towards a sonic receiver where it is detected. Since the distance between transmitter and receiver is known, the sound velocity can easily be calculated by measuring the travel time of the sonic signal. As a specific property of each liquid, the correlation between concentration and sound velocity can be described by a mathematical polynomial. With decades of experience and our own laboratory facilities, Centec know the polynomials for a large number of products. Any temperature drifts of the measured signal are automatically compensated for by an internal Pt1000 sensor. SONATEC can display sound velocity and concentration in various units. For sound velocity measurement in tanks, Centec offer a variety of specially designed SONATEC sensors.

  • Most accurate technology to determine sound velocity and concentration
  • Patented compact design with local display available
  • Large variety of materials and flange connections
  • Hygienic execution and full CIP capability
  • Easy to operate and maintenance-free

Technical Data

Measuring Range400 – 3.000 m/s
Accuracy± 0,05 m/s
Repeatability± 0,01 m/s
Response Time≤ 1 s
Pressure of Operationmax. 16 bar
Temperature of Operation– 25 – + 125 °C
Temperature SensorPt1000
Material1.4404/1.4435/AISI 316L; Hastelloy; Tantalum; others on request
ConnectionsDIN-, ANSI-, JIS- and other flange connections in different sizes and immersion lengths (sensor head) available
Input Transmitter Version6 x digital (24 VDC)
Output Transmitter Version3 x digital (24 VDC) & 2 x analog (4 – 20 mA)
Profibus DP Transmitter Versionoption
Profibus DP Sensor (w/o local display)standard
Enclosure RatingIP65
Explosion Protection (ATEX) Ex II 2G EEx d IIC T6option
Power Supply24 VDC


JMR EUROPE Sp. z o.o.
Sobieskiego 11/204-C
40-084 Katowice

Tel: +48 (32) 352 04 24
Kom: +48 601 424 429