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Excellent. I don't think it's mentioned in the set up instructions. May be worthwhile adding :)

It done it again yesterday. Would having the vent tube submerged in the waste container make this happen? Somebody pointed it out to me and I think he is right.

Well, it is sorted now. It seems somehow it missed a flushing cycle I'd imagine and over pressurised the test cell.
I emptied it out, flushed it a couple of times and its ok now. Just need to get a...

I'm really getting a bit fed up now.
I've used about 200ml of reagent now and still cant get two similar results.
And now, the tube at the waste water pump from the KHD now keeps blowing off and...

Mine is the same, All over the place from 3 to 12. I thought it had settled to 6.8 but its now on 5. Must have done about 12 tests now.