You may not be aware but the SmartDiver takes multiple measurements concurrently while diving.  Some of this information we use, some we don’t.  In the last blog we talked about using Specific Gravity (SG) to measure into the mud zone, not just the settling solids.

Another measurement available is the liquor density.  So as we start a dive and we take our readings of overflow suspended solids, we can also take the liquor density reading.  You will know that in an alumina refinery, liquor density is directly proportional to caustic concentration (caustic).

In this blog featured image you will see the trend of the SmartDiver liquor density readings vs the lab caustic readings. Here we have regressed the SmartDiver readings and displayed and outputted the calculated caustic. The R square is 0.89 (very close to the lab results) and the value for the liquor density is 9.98×10-38 (see below).  You will also see that the SmartDiver reading is smoother than the lab results. This is due to the fact that the measurement is taken every six minutes and it is not affected by sampling errors. We will talk more about sampling errors in future blogs.

One of our customers in Jamaica has recently used a SmartDiver specifically for the settler overflow caustic measurement (a very hard measurement to take in line).  The customer was able to monitor the settler overflow caustic for dilution control. This was critical for his operation.

You can also measure washer and CCD efficiency using the same technique. It does not cost you anything, just turn the feature on your SmartDiver on.  To find out more contact our technical team at or call us on +61 3 9786 1711.


Category: SmartDiver