WP
4
PotentiaMeter
Calibration and Verification Standards
28
4. If your WP4 is reading within 0.1 MPa of the KCl
solution, proceed with sampling. If it is not, a
change in calibration may have occurred, or the
sensor chamber may be contaminated. For
cleaning instructions, see Chapter 10. After
cleaning, repeat these instructions.
5. If, after cleaning, you consistently get readings
that are outside of the proper water potential of
the KCl by more than ±0.1, a change in calibra-
tion has probably occurred. In this case, adjust
the reading on the KCl measurement to its cor-
rect value. This is done by the following:
Adjusting Calibration
1. Once you have determined that your calibration
needs adjustment, enter the system configuration
menu by pressing the lower left button in the
main menu. Press the upper right button in the
system configuration menu to enter the calibra-
tion menu. You will be guided through the cali-
bration routine. The following screen will
appear:
Change the offset?
yes
no
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