concentration measurement


Thread Starter


I'am looking for a best way for the concentration measurement of Ca(OH)2(15%)
and CaSO4(30-40%), Density or pH is maybe one of the choices, any others? and also looking for the meter manufactory which can provide such application?
someone can help me?
I am assuming you want to measure continuously and in real time in the process.
You need to provide some conditions e.g. temperature, pressure, flow rates and pipe size or tank capcity etc.
Density is a very good way to look at concentration. Of the various methods available one is to use vibrational technologies. This can
include the "coriolis" density meters i.e. mass flow meters where the density measurement is possible because in order to measure mass flow
rate they operate at vibrational frequency (i.e. the density measurement has nothing to do with the coriolis effect) or a dedicated density
There are many companies you could try including:
Dynatrol: "":
Controlotron: "":http://
Sarasota: "":
Not forgetting our own company, Solarton: "":
Or consider radiation devices such as:
Berthold: "":
To choose your device you need to know how important is the variation of density with temperature, and whether the variation of base density (density at a reference temperature) varies with concentration. Some devices are very temperature sensitive so their accuracy may be
affected by the process temperature. You need to be sure what effects the process conditions will have on the sensor performance as well as
the effects on the product.
I suggest you collect some process data and talk to some of these companies. You should be able to get a very clear statement of accuracy
based on the device and process conditions. Don't just look at the literature figures in technical data sheets. Often the way accuracy is
described follows a convention for that measurement but does not reveal how well or how badly they may actually perform under process
conditions. Most accuracy statements will tell you about the factory calibration at 20degC. Anytime you involve temperature either added
heat or from an exothermic reaction you must take this into account.
Finally, be sure you know what accuracy you are looking for or are prepared to pay for.

Willem de Jong

Since a few years, ultrasonic technology has been developed specifically for the measurement of CaOH containing slurries. Very high densities can be measured, up to well over 1300 g/l, at the rough process conditions that are usually encountered in this field. If you wish, I can send you our application note with examples of systems that are suitable for your application.
Our website is "": Should you require information about the Rhosonics analyzers, just send me an e-mail at "[email protected]", mailto:[email protected]
Best regards,
Willem de Jong