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KH director - Measurements do not meet expectations
Hi,
I have some trouble when comes to accuracy of KH-director. I discovered that the measuring numbers varies between samples and this does not depends an the actual value of dKH.
I did recalibrate the dosing pumps and the PH probe and it didn't help, but then I saw Air bubbels in the reagent tube (between dosing pump and KH-director). I vent the tube several time to ged rid of the bubbels and then I got a measurement close to the ecpected value. But the air bubbles kip coming back after few measurments, what should I do?
PS:
I had ordered the package below when I purchased the KH-director i.e I use the PVC tube.
3 x 1l reagent fluid
70 cm Flex PVC tube
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What is the distance of the reagent bottle from the KHD unit?
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