WP4C 3 GETTING STARTED
protect it during shipment. Remove this sample cup and turn the
instrument on. The ON/OFF switch is located on the lower right
corner of the WP4C back panel. The model and then the main menu
will appear on the LCD.
Then:
This is the Main menu, displaying the water potential in both Mega-
Pascals (MPa) and pF, and the sample temperature in
◦
C. In order to
provide the most accurate readings, WP4C should ideally be allowed
a warm-up period of 15 to 30 minutes after turning it on. When you
insert a sample 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.
3.5 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 WP4C 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 12 V
output (cigarette lighter) of your vehicle. The inverter should
have a continuous output of at least 140 Watts.
9
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