How can we prevent coating of the pH glass and clear a scale coated pH Sensor?

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How can we prevent coating of the pH glass and clear a scale coated pH Sensor?

How can we prevent coating of the pH Glass?
Coating of the glass causes poor contact between the glass itself and the process. Good contact by the electrode is essential for quick, accurate response in the process. Thus, to help keep the glass clean and responsive, there are a couple of techniques that can be used.  IC Controls sensors are designed with two flutes to allow self cleaning. By turning the flutes to 75°, the process does not directly hit the glass which will slow down the coating action. Therefore, there is no mechanical cleaning which increases reliability and reduces maintenance. Insert the electrode with the flutes at 75° to flow. By inserting the probe at this angle a vortex will be created around the glass. The vortex will increase the velocity of the process around the glass and reference which will, in return, hasten electrode response time and keep the reference and glass cleaner. This approach is particularly beneficial where sharp, fines material can wear away any lime buildup.

Advantages:
– No Mechanical Parts to Fail
– Longer Sensor Life
– Less Maintenance
– Better pH Response

In application where the flow is stagnant, or not linear, or the coating is soft, a chemical spray cleaner can be attached to the tip of the pH sensor. Mounting the spray cleaner on the tip allows timed intervals of automatic cleaning without operator handling or maintenance. Spray cleaning also allows choice of the best chemical for cleaning the pH sensor and improving response.

Advantages:
– Reduced Operator Handling
– Longer Sensor Life
– Less Maintenance
– Better pH Response

How can you clear a scale coated pH Sensor?
In the past, a hydrochloric acid (HCl) solution was used to remove scale form the tip of the electrode. Although this has been somewhat effective, IC Controls’ gentle scale remover, P/N A1100094, will better clean the electrode. You can also try using liquid detergent to remove minor coatings.

 

2017-02-27T21:14:27+00:00 February 21st, 2017|