GE Moisture Image 1 Series, Service Manual, Page: 89 / 107

Application of the Hygrometer (900-901D1) A-27
June 2003
B: Special Case (cont.)
Note: The saturation value at 50°C for this liquid could also have
been determined by connecting the K value of 5.1 with the
ambient temperature of 50°C and reading a value of 475
PPM
W
on the right scale.
For many applications, a knowledge of the absolute moisture content
of the liquid is not required. Either the dew point of the liquid or its
percent saturation is the only value needed. For such applications, the
saturation value for the liquid need not be known. The GE
Panametrics hygrometer can be used directly to determine the dew
point, and then the percent saturation can be calculated from the
vapor pressures of water at the measured dew point and at the
ambient temperature of the liquid:
% Saturation
C
C
S
------ 100
×
P
W
P
S
-------- 100
×
= =