Since at least 2 years, there is a leak at the bottom of the combustion tube (use with high-sensitivity catalyst) that leave a residu. This residu seem to be iron oxide. It's like black mug when newly apppeared than become like rust particles when dry. Three differents technicians came for maintenance of this equipement and none of them were able to correct the problem. In fact, they never saw anything like this. This leak don't affect the results but there is definitely a problem. Our device is getting old, but it has always been well maintained. I can't do anything but clean this residu every week. We analyze only high quality water samples.
Where the leak could come? How to fix it? I await your suggestions...Thanks you!
Recurrent problem with TOC-vcph analyser