PLATO MONITOR is a variant of SONATEC and allows measuring original gravity of beer in the manufacturing process. Typically, original gravity is determined during beer filtration and in front of the filler.


PLATO MONITOR is a special version of SONATEC and continuously measures the speed of sound through the product. 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.

  • Most accurate technology to determine original gravity in the manufacturing process
  • Patented compact design with local display available
  • Hygienic execution and full CIP capability
  • Easy to operate and maintenance-free

Technical Data

Measuring Range0 – 25 °Plato
Accuracy± 0,05 °Plato
Measuring Temperature Range-3 – +25 °C
Response Time≤ 1 s
Pressure of Operation max.16 bar
Temperature of Operation– 25 – + 125 °C
Temperature SensorPt1000
Material1.4404/1.4435/AISI 316L; Hastelloy; Tantal; others on request
ConnectionsVarivent© DN65; dairy fitting DIN11851 DN65; others on request
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
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