Sodium hydroxide (NaOH) concentration measurement

The concentration of sodium hydroxide (NaOH) or potassium hydroxide (KOH) is calculated by measuring the conductivity and temperature of the liquid. Valmet offers readymade concentration measurement recipes for various sodium- potassium hydroxide  solutions. The concentration is shown as % or g/l units depending on the recipe used. The sensors are readily calibrated and the cell constant is stored in the sensor memory. All you have to do is install the sensor in the process pipe and power up the measurement.

Valmet Concentration measurement requires only minimum maintenance and is accurate thanks to fouling resistant 4 electrode technology. The sensors are designed to withstand rapid temperature changes have a long lifetime even in the most demanding applications.

For easy installation and maintenance Valmet has selection of retractable sluice mounted sensors. There is no need to build a separate measurement loop, you just have to weld the provided chamber to the pipe during shut down and you can install the sensor whenever you like. 

Mounting the Valmet sluice sensor

Valmet sensors for sodium hydroxideOther mounting options are available.

Sodium hydroxide (NaOH) measurements
Solution Measuring range Temperature
 NaOH  0-10 %  0-100 °C
 NaOH  20-40 %  20-50 °C
 NaOH  45-55 %  40-75 °C
 NaOH  0-70 g/l  20-180 °C
 NaOH  0-150 g/l  20-100 °C
 NaOH  100-200 g/l  40-100 °C
 KOH  20-30 %  50-70 °C