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How WP4C takes Readings
WP4C's cooled mirror is controlled at the chamber dew
point and its temperature is measured.. When the instru-
ment has finished its read cycle, the water potential is dis-
played, accompanied by the LED flash and beeper (if you
have the beeper enabled).
Cautions
•
Never leave a sample in your WP4C after a reading has
finished. The sample may spill and contaminate the
instrument's chamber if the instrument is accidentally
moved or jolted.
•
Never try to move your instrument after a sample has
been loaded. Movement may cause the sample mate-
rial to spill and contaminate the sample chamber.
•
Take special care not to move the sample drawer too
quickly when loading or unloading liquid samples, in
order to avoid spilling.
•
If a sample has a temperature that is higher than the
WP4C's chamber (Ts-Tb is a positive number), take
the sample out immediately, put a cap on it, and cool
it. Warm samples can cause condensation in the
chamber and adversely affect subsequent readings.
WP
4C
7. Taking a Reading
31
PotentiaMeter
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