WP
4
PotentiaMeter
Getting Started
13
Then:
This is the main menu, displaying the water poten-
tial in both MegaPascals (MPa) and pF, and the sam-
ple temperature in °C.
In order to provide the most accurate readings, WP4
should ideally be allowed a warm-up period of 30
minutes after turning it on. When you insert a sam-
ple into the chamber drawer and turn the drawer
knob to the “READ” position, the instrument will
begin the read cycle to measure the water potential
of your sample.
Portability
On occasion you may want to take water potential
measurements in the field where it is not feasible to
take samples and return to the lab. The following is
a procedure for powering your WP4 using your
vehicle as a power source at sites where AC power
is not readily available.
1. Purchase a portable power inverter that plugs
into the 12V output (cigarette lighter) of your
vehicle. We strongly recommend that this
0.0°C
0.00 MPa
pF 0.00
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