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Detergent Concentration Monitoring

During practical application, user always refers us about the mixing ratio for detergent to be used as working solution.  Furthermore, some user also wants us to advise the detergent concentration monitoring method to ensure the working solution is mixed within the ratio.
In this article, we are going to elaborate more about the methods for monitoring detergent concentration in the working solution.

Method for Monitor Detergent Concentration

There are 2 ways for monitoring the detergent working solution concentration,

  • By volume mixing
  • Conductivity measurement

We are going to explain these few methods and also the limitation for respective method.

By Volume Mixing detergent

While applying detergent in the production line, we always advise the concentration ratio for working solution.  For instance for our EC series detergent, the working concentration is falling within the range 0.5% to 3% by volume.  The concentration could be used as the start up referring value for user to evaluate our detergent.

For user who is having a specific tank, mixing 0.5% concentration by volume could be easier activity.  However for user who having in line working solution flow, it could be challenging to ensure solution concentration by volume mixing.

Conductivity Measurement

Conductivity measurement on working solution is the commonly used method for user who wants precise concentration ratio.  For EC series detergent, the ionic content in inorganic salt in a solution may vary after certain level of detergent being mixed in the water.  Higher detergent concentration in a solution implies more ions being added in the solution, which means higher conductivity value.

During application, the conductivity value may present linear relation within a certain range of concentration.  This means if the concentration of a working solution fall within the linear equation range, then user could make use the linearity characteristic to determine the detergent concentration.

In order to adopt conductivity measurement to determine the solution concentration, user has to perform thorough study to understand the conductivity distribution range for a dedicated detergent.  This may takes some time at the beginning however the linearity chart may help to monitor more accurate detergent concentration in a working solution.

One thing to be remember, conductivity reading is not an absolute value for a solution, hence there are some precautious for user who wants to use conductivity measurement for detergent concentration monitoring.  The below are factors may affected the conductivity reading:

  • Solution temperature.
  • Concentration range

Conductivity MeterConductivity Meter

There is several conductivity meters available in the market.  You can just select a meter which suits your working range and accuracy needs.  A conductivity meter should also include:

  • Calibration specimen
  • Temperature sensor
  • Various electrode with difference measurement range

User could use the calibration specimen to perform the base line testing.  For more demanding user, you could select standard conductivity solution to confirm the reading.

Hopefully you have the basic understanding about the basic knowledge about performing detergent concentration monitoring.

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