Sainsmart oyone sensor MQ131

hi
I am trying to use the Sainsmart ozone sensor MQ131. )with a metal sensor on it not plastic) it is quite strange.
the values come out the analog pin, ok, however the value gets smaller the higher the concentration. It gets nowhere near the range that is indicated, at least not in the high range.
the knob on the module does not vary the values, As far as I can figure it just sets the trigger level for the digital pin, (for some standalone use)
Value is nearly 0 already and I am not even at 1/10 of the value range indicated.
so it really is only for very low concentrations. and I cant find any way to convert the value to a unit. ppb or ppm or something.

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