yes, this is what I think

with the flow you get rid of the air between both platinum electrodes

I am discussing this at the moment with our probe manufacturer, I must ask you all for some more patience, I think this will take another 2-3 weeks until we have a reasonable solution

until then I recommend to bring the probe into flow, the slot must be in line with the flow

or tip the probe daily until we have the solution

sorry for the trouble, but we have to wait for the probe manufacturer