Thanks for your reply. I am not certain that it will work, if it can’t identify the substances.

Is it only the industrial version that can have different sensors? Are they expensive, or is it possible to exchange them step by step, if I where to narrow things down?

There was a time, when I used a very good 3M Full-face respirator (gas mask). When I used it with the “3M™ Gas, Vapour and Particulate Filter, A2B2E2K2HgP3 R + Formaldehyde, 6099” filter (6099, is kind of the best of the best of their filters), then I was safe. So I know that I don’t have to try to find VOC, that isn’t blocked by it.

The information is as follows:
3M™Gas, Vapour and Particulate Filter 6099 protect against organic vapours (boiling point above 65 °C) inorganic vapours, acid gases, ammonia and its derivatives, mercury, formaldehyde up to 10ppm and particulates. Filter capacity Class 2 – medium capacity, up to 5000ppm.
There is a specific list of substances and to what level, the filter protects against it, but I haven’t been able to find it right now.

I can tell you that it was very exhausting to breath through it, so I did try the ABEK1+P3 filter, instead of the ABEK2P3 filter previously mentioned. But it didn’t work. It gave me, no protection what so ever… If I could have afforded it, I would have bought a fan powered unit. But now it doesn’t matter anymore, since I react to a certain type of rubber used for the valves in the mask.