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If you have the latest GCC 1116 on the KHD page at the bottom you can see the ph readings, these should change as the reagent is added, during measurement. You should also be able to feel/see a vibration in the pipes during this as the circulation pump mixes the reagent and sample water. Mine did neither of these
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Thanks for reply can i ask is the value of your probe continually moving when no regent is added mine goes from 3.5 to 4.3 when no thing is happening
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Mine starts at 5.5 then rises to tank ph8.2 then drops quickly as soon as the reagent is added.. down to 6.5 after about 30secs and carries on dropping