EXTRACT MONITOR is a variant of RHOTEC or SONATEC and used in the brew house of the brewery.

Typically, the extract measurement is done during lautering and wort boiling. The instrument uses the functionality of either RHOTEC (density measurement) or SONATEC (sound velocity measurement) and is designed for applications requiring maximum sensitivity and highest accuracy. It is easy to operate and maintenance-free.

The density measurement is based on the oscillating U-tube principle. For sound velocity measurement a sound pulse is created by a sonic transmitter and detected by a sonic receiver. As a specific property of each liquid, the correlation between concentration and density resp. 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.