BeerMonitor – online alcohol and extract monitoring in fermentation

BeerMonitor is state-of-art online sensor transmitter for determination of Alcohol and Extract during fermentation. It is based on density and Sound Velocity Measurement, and use for highly precise and accurate monitoring Alcohol, Extract and Orignal gravity.


BeerMonitor – online alcohol, extract and original gravity (OG) monitor with display

pdf-imageonline, continuous measurement of alcohol content, extract, original gravity (OG) in fermentation process, based on optical technology, precise measurement
Make: Centec GmbH (Germany)


The Principle

BEERMONITOR is a special type of COMBITEC sensor.

Before fermentation, there exists a 2-component system – a mixture of water and extract. The concentration of this liquid can be determined by measuring density or sound velocity. During fermentation, the sugars content in the wort is converted into alcohol and CO2.

Therefore, a 3-component system consisting of water, extract and alcohol emerges. By a combination of fluid density sensing and sound velocity measurement, alcohol and extract content can be separately determined. This allows calculating the degree of fermentation and the Original Gravity (OG) with extreme precision (“Balling’s Formula”).

OG is a crucial factor for the alcohol content and the character of the finished beer and needs to be controlled with care. The increasing CO2 content is automatically compensated by CO2 measurement with CARBOTEC. Original gravity can also be determined by just measuring sound velocity.

During fermentation, sound velocity virtually does not change. As a special type of SONATEC, the PLATOMONITOR is an economic instrument for OG calculation without extract and alcohol measurement. But its accuracy is slightly lower than BEERMONITOR.


Online monitoring of specific gravity, density, alochol, extract in breweries, food production, alcohol
Online monitoring of specific gravity, density, alcohol, extract in breweries, food production, alcohol

Key Features:

  • Available as Transmitter Version with Local Display with sensor
  • Highly Precise and Fast Determination of Alcohol, Extract and OG
  • Based on Density and Sound Velocity Measurement
  • Designed for the Specific Needs of Breweries
  • Short Response Time and Excellent Long-Term Stability
  • Hygienic Execution, Full CIP Capability and Maintenance Free
  • Outstanding Price-Performance-Ratio

Key Specifications:

  • Original Gravity:
    • Measurement Range: 0 – 25 °Plato
    • Accuracy: ± 0.03 °Plato
  • Extract:
    • Measurement Range:0 – 10 mass %
    • Accuracy: ± 0.02 mass %
  • Alcohol:
    • Measurement Range: 0 – 12.5 vol.%
    • Accuracy: ± 0.02 vol.%
  • Response Time: ≤ 1 s
  • Pressure of Operation: max. 16 bar
  • Temperature of Operation: – 25 ~ + 125 °C
  • Temperature Compensation: Pt1000
  • Material: 1.4404/AISI 316L; Hastelloy C276; Monel 400; Incoloy 825; others on request
  • Connections:
    • compatible to Varivent©
    • Inline-Housings DN40 – DN150;
    • others on request
  • Input, Transmitter Version: 10 x digital (24 VDC) & 2 x analog (4 – 20 mA)
  • Output, Transmitter Version: 5 x digital (24 VDC) & 2 x analog (4 – 20 mA)
  • Profibus DP:
    • Transmitter Version: option
    • Sensor (w/o local display): standard
  • Enclosure Rating: IP65
  • Power Supply: 24 VDC

Application / Industry:

  • Breweries, food, alcohol manufacturing
  • Marine, shipping, ship building
  • Water, effluent treatment system