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PART THREE - OPERATION
SECTION 4 - CALIBRATE MENU
Model P63 pH Analyzer
Rev. 7-1201
46
☞
2.
Immerse the sensor in a pre-defined buffer and allow
their temperatures to equalize.
(For two-point calibra-
tions you can put the sensor in either buffer.)
The
analyzer recognizes each buffer and automatically initi-
ates calibration of that point. If the analyzer cannot
recognize the buffer, either the buffer is not one of the
pre-selected buffers or the sensor may not be operating
properly.
3.
Continue calibration by following the simple instructions
shown on the analyzer display screen. When you com-
plete calibration of a point, the measured buffer value
may be slightly different than the selected pre-defined
buffer value. This is because the analyzer uses the ex-
act value for that buffer at that temperature (obtained
from its built-in buffer value-versus-temperature table),
providing the highest possible measuring accuracy.
NOTE:
The “pH” or “
°
C” annunciator may flash, indicating
that the respective pH or temperature measure-
ment signal is still too unstable for an accurate
calibration. When the “Pre-defined Buffer” method
is used, the analyzer automatically waits for the pH
and temperature readings to stabilize, providing the
highest possible calibration accuracy.
The signal stability at which the annunciators stop
flashing is selectable. (Use “Stability Mode” screen
in “Main Parameter” submenu of CONFIGURE
main menu). A LOW stability mode enables the
analyzer to accept a less stable measurement sig-
nal where pH or temperature is moderately
changing. A HIGH stability mode requires the signal
to be highly stable before flashing stops. A MED
stability mode is midway between the other modes.
The HIGH stability mode provides best calibration
accuracy but takes longer. Also, in a noisy envi-
ronment the measurement signal may never fully
stabilize. The stability mode default is LOW.
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