Chapter 4. Using Special Features
56 Model PM880 Portable Hygrometer User’s Manual
4.8.1 Entering a Saturation Constant
The PM880 requires a saturation constant in order to calculate ppm
w
in
non-aqueous liquids. If you do not know the saturation constants of the
process liquid sample, contact the factory. To enter a saturation constant
(Cs), you must enter 1 to 8 data points to represent a curve of Cs (values)
versus temperature.
To enter data for a saturation constant:
1. If the menu is not active, press [MENU].
2. Use the arrow key to scroll to Program and press [ENTER].
3. Use the arrow key to scroll to Calibrate and press [ENTER].
4. Use the arrow key to scroll to Saturation tab and press [ENTER]. A
screen similar to Figure 23 appears.
Figure 23: Saturation Window
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