A new humidity calibration facility whi c h uses the two-press ure prin c ipl e for gene rating gas of known humidity has been de veloped at NBS for calibrating and testing hygrome ters. The relat ive humidity range of the two-pressure humidit y gene rator is 3 to 98 percent for ambient tempe ratures -60 to 80 C and test c hamber pressu res 5 to 200 kPa (abso lut e) . Thi s is equival e nt to a nomina l d ew/ frost poi nt ra nge of -80 to 80C. Intercomparison tests we re mad e with the NBS sta ndard grav ime tri c hygrometer over a portion of the gene rator's opera tin g range. The estimated maximum uncert aint y (three sta ndard de viations) is 0 .2 percent RH for tempe ratures 0 to 80 C whi c h in units of d ew point corresponds to a n estim ated max imum uncerta int y of 0.04 C for de w points -35 to 80C.
No takes yet. Share an insight, caveat, or question.
Hasegawa et al. (1977) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context:
More from Journal of Research of the National Bureau of Standards Section A Physics and Chemistry