4. Press
MN/MX/AV
to enter P3.1, the LCD displays one of four
available slope values; P3.1, P3.2, P3.3, P3.4. If the value is less
than 75% or more than 115%, change the probe immediately.
5. Press
MN/MX/AV
to enter P3.2, P3.3, and P3.4.
Note...
The solution range definition differs between N.I.S.T. and
Custom buffers.
6. Press MN/MX/AV to enter P3.5 and view
the offset value. The offset value is the mV
value of pH 7 and the default offset value
is 0.0. The offset value will be different
after calibration. If the value is outside
the range of ± 60 mV, replace the probe.
P4.0 pH Calibration Buffer
This meter allows the selection of two different types of pH buffers:
N.I.S.T. or CUSTOM. Selection of the proper buffer type more
accurately calibrates the probe to specific requirements.
N.I.S.T.
buffer: (five settings)
pH 1.68, 4.01, 6.86, 9.18, 12.45
CUSTOM
buffer: (five ranges)
pH 1.00-3.00, 3.50-5.50, 6.00-8.00, 8.50-10.50, 11.50-13.50
7