[Scott449]

I have some PVC insulated wired in a conduit system that also has some water(not by design) in there.  When the PVC is heated it is offgassing ( chlorine I think) and said gas is mixing with the water vapor under heat and producing some sort of acidic vapor. 
what is this vapor?  I believe this is HCL. Can HCL be formed this way?
is there a way to quantify the PH value?

ANY help or incite would be much appreciated.

[Hunter2]

Yes PVC develop HCl and others at combustion or strong heat. PH can be measured with an probe.