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PART THREE - OPERATION
SECTION 4 - CALIBRATE MENU
Model P63 pH Analyzer
Rev. 7-1201
50
4.5 Temperature
Calibration
buffer set choices are available). Consequently, when using
the wash/cal method you must preset the analyzer with low
and high buffer values before starting any calibration. (To
select and enter buffer values, refer to the “Pre-Defined
Buffer Method” subsection previously described in this sec-
tion.) After a pre-defined buffer is dispensed to the sensor,
calibration automatically starts. When a single-point cali-
bration is required, only one of the pre-defined buffers is
needed.
The length of time it takes for the analyzer to calibrate a
point is determined by the selected signal stability mode.
(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 signal
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 cali-
bration accuracy but takes longer. Also, in a noisy
environment the measurement signal may never fully stabi-
lize. The stability mode default is LOW.
The analyzer uses the selected stability mode to determine
when the pH and temperature measurement signals are ac-
ceptably stable to complete calibration of that point. The
“Wash/Cal” method eliminates the requirement to watch for
the “pH” and “
°
C” annunciators to stop flashing and then
pressing the
ENTER key
to complete calibration of that
point.
The analyzer is factory-calibrated for highly accurate tem-
perature measurement. You only need to calibrate for
temperature when the very highest accuracy is required.
However, do not attempt to temperature calibrate the
analyzer unless you have accurate temperature stan-
dards (accurate to within ± 0.1
°
C), and are able to wait
for the system to come to temperature equilibrium (ap-
proximately 30 minutes for each calibration point).
To
calibrate for temperature, follow the simple instructions
shown on the analyzer display screens.
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