Hi Vinny, there is something I don't quite understand. The pump producing the noise is the internal pump, the one mixing the sample water with the reagent in the internal cell. Can you modify the speed of this pump? If so, how do you do it?
Printable View
Hi Vinny, there is something I don't quite understand. The pump producing the noise is the internal pump, the one mixing the sample water with the reagent in the internal cell. Can you modify the speed of this pump? If so, how do you do it?
There is something somehow implicit in your observations and that is worrying me. If the speed of the dosing heads depends upon the type of head cover, that may mean that a worn out cover changes the speed of the dosing head. Then, you would have variable speeds depending on the degradation degree of the cover, which would modify the sample volume and the reagent volume resulting in differences in the measurements.
I have observed that from time to time the KHD gives an alkalinity lecture quite different from the ones previously observed. Then, the following ones may be again in range.
Not sure if I can reopen this thread or not. I actually did not see this last post previously but I share the same concern that that has the heads wear, tolerances will change and at the very least need to be recalibrated as the amount dosed is going to change. The reason for revisiting this is because this weekend I took down my KHD and it's respective doser for inspection and maintenance. I have ordered parts from my LFS because I am still down one head (borrowed the cover) from a previous failure and wanted a spare. It is now going on 3 weeks and my LFS has not received the parts that were ordered. During the cleaning of the heads on the doser I discovered two of the heads were damaged as before. My concern about this is that they were the new stronger heads, so apparently even tho they last longer, they are still going to fail. I opened a ticket on the GHL ticketing system on Sunday but no one has responded. I rebuilt all the heads with the best of the damaged parts, also borrowing from my other doser to get this one back up and going. I'm not sure what to do here. Am I just going to just have to rebuild the heads every 3 to 4 months? The other thing I noticed is even tho the new heads broke exactly like the ones before, same location, they didn't stop working. This is good and bad. The KHD didn't stop functioning, but the damaged head covers pretty much just ate up the rollers which in turn, damaged the tubing so it was a full rebuild on the damaged heads.