WP
4
PotentiaMeter
About the WP4
7
In addition to the technique described above, WP4
uses an internal fan that circulates the air within the
sample chamber to reduce time to equilibrium.
Since both dewpoint and sample surface tempera-
tures are simultaneously measured, the need for
complete thermal equilibrium is eliminated, which
reduces measurement times to less than five min-
utes.
The WP4-T gives you the option of controlling the
sample temperature, by means of an internal
thermo-electrically controlled module that monitors
and stabilizes the sample block temperature accord-
ing to how it is programmed. This can also help in
making more rapid measurements.
WP4 and Temperature
Temperature gradients can often be of concern for
making stable water potential measurements. Since
water potential is influenced by temperature, best
results are obtained by controlling the temperature.
Samples that are not at room temperature during the
read cycle will need to equilibrate to the tempera-
ture of the WP4 before accurate measurements of
water potential can be made. Large temperature dif-
ferences will cause longer reading times, since a
complete and accurate reading will not be made
until the sample and the instrument are within 0.1
degree of each other. To help you monitor the tem-
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