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Bobbi75
07.12.2018, 10:57
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

Vinny
07.12.2018, 18:13
What is the distance of the reagent bottle from the KHD unit?

Bobbi75
07.12.2018, 18:35
Ca 25cm