Detection for unfeasible values / BUG detection

[ghost]

My fine dust sensor did pick up almost no particles during the last days see.
Today I got suspicious. I opened the case and checked. All o.k.
I re cabled. No change - Values around 0 µg/m³.

Only when I removed the tube the values got to 10 µg/m³.
Inspecting the tube I found this BUG ;)

Even after rinsing the BUG out almost no water passed though the tube. I had to physically remove the web created by the BUG. It seems to me the web was filtering out almost all fine dust particles.

Now the serious part. Is there any way you can alert the owner of a sensor producing unfeasible values. Maybe you could display a warning sign and disregard the reading.

... needless to say this bug has no high priority anymore