We tried to measure the dewpoint for Argon and Nitrogen compressed gases which theoretically are the at - 186 degC and - 70 degC using the DMP74B dewpoint analyzer, but We are unable to get the accurate reading of the dewpoint.

Wanted what clarification:
A) If the medium * for dewpoint have a who range than the analyzer, informs, will the analyzer home as it is beyond the difference of a lower reading accuracy region?
B) Can dry gases like argon and nitrogen be 2 test dewpoint have the Vaisala DMP74B type analyzers?