4/9/98
A-40 Application of the Hygrometer (900-901D1)
Solids Applications
A. In-Line Measurements
GE Panametrics moisture probes may be installed in-line to
continuously monitor the drying process of a solid. Install one
sensor at the process system inlet to monitor the moisture content
of the drying gas and install a second sensor at the process system
outlet to monitor the moisture content of the discharged gas.
When the two sensors read the same (or close to the same) dew
point, the drying process is complete. For example, a system of
this type has been used successfully to monitor the drying of
photographic film.
If one wishes to measure the absolute moisture content of the
solid at any time during such a process, then an empirical
calibration is required:
1. At a particular set of operating conditions (i.e. flow rate,
temperature and pressure), the hygrometer dew point reading
can be calibrated against solids samples with known moisture
contents.
2. Assuming the operating conditions are relatively constant, the
hygrometer dew point reading can be noted and a solids
sample withdrawn for laboratory analysis.
3. Repeat this procedure until a calibration curve over the
desired moisture content range has been developed.
Once such a curve has been developed, the hygrometer can then
be used to continuously monitor the moisture content of the solid
(as long as operating conditions are relatively constant).
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