WP
4
PotentiaMeter
About the WP4
8
perature difference between your sample and the
instrument, you can access a sample equilibration
screen at the main menu.
Though temperature control is usually unnecessary
for most applications, there are some instances
where it is desired. For this reason, Decagon offers
a temperature-controlled WP4 model: the WP4-T.
There are several advantages in having a tempera-
ture-controlled model. Here are a few major rea-
sons:
1. Research purposes. To study the effects of
temperature on the water potential of a sample,
comparison of the water potential of different
samples independent of temperature, or other
water potential studies where temperature con-
trol is critical.
2. To minimize extreme ambient temperature
fluctuations. If the laboratory and WP4 temper-
atures fluctuate by as much as ± 5°C daily, water
potential readings can vary as much as ± 0.5
MPa on a dry soil sample.
WP4-T
The WP4-T has thermoelectric components installed
that allow the instrument to maintain a set chamber
temperature without the need of an external water
bath. The WP4-T has an extra option in the System
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