Valmet Cooking Liquor Measurement 3400

In-line cooking liquor meter for residual alkali and white liquor measurements

Robust and accurate alkali measurement for digester control

The cooking liquor residual alkali concentration is calculated from conductivity and temperature measurements. Valmet Cooking liquor meter provides continuous and accurate residual alkali reading as effective alkali or active alkali. Valmet Cooking Alkali measurements are formerly known as Kemotron.

Read more about digester control using Valmet Cooking Alkali meter here



Valmet Cooking Alkali meters in continuous process 


Valmet Cooking Alkali meter has pre-set calibration curves for white liquor and black liquor concentration. The preset curves reduce the time required for start-up and makes calibration of the device easy. 

Valmet Cooking Alkali meter is installed over the pumps in various positions in the digester. Another option is to install the cooking liquor sensor directly in line using a retractable, sluice mounted sensor.

Read more about installations here


Valmet Cooking Measurement installed in the C6 trim circulation
in a continuous digester


Installation of the Valmet Cooking Liquor Measurement

Valmet Cooking Measurement sensor installed in a measuring pipe. It is placed in a bypass loop, thus providing safe withdrawal of the sensor during the digester operation in case of the need for removal of any substantial deposits.



This picture illustrates how heavy the scaling can become while still having a functional sensor due to automatic balancing of the measuring field. In addition the Measurement provides scaling indication.


Stable measurements – long lifetime

Valmet Cooking Alkali meter has a typical lifetime of more than 10 years in cooking liquor measurement applications. The unique design of the sensor takes into account high temperature and large temperature variations that can easily damage other conductivity sensors.




Optimizing the continuous cooking digesters at Stora Enso Imatra Mills

Stora Enso Imatra Mills annually produce approximately one million tons of board and paper. The main production is of liquid packaging for beverage cartoons, and food services boards for paper cups and other food packages