PART THREE - OPERATION
SECTION 4 - CALIBRATE MENU
Model P63 pH Analyzer
Rev. 7-1201
42
☞
4.4 pH Calibration
Methods
By selecting yes, the analyzer establishes a “base line” of
electrode statistics from which subsequent calibrations are
compared. It takes several minutes longer than normal for a
“first-time” sensor calibration to establish this base line.
These statistics are stored in the “Calibration Record” sub-
menu in the DIAGNOSTICS main menu.
NOTE:
When calibrating a sensor for the first time, always
perform a two-point calibration.
Important: During
any calibration, always allow the temperatures
of the sensor and buffers to equalize.
Based on convenience and your application requirements,
use one of four methods provided (see screen below) to
calibrate the analyzer for pH measurement:
•
Arbitrary Buffer Method:
With the sensor placed in any
pH buffer, enter its known value. This method can be
used for single or two-point calibrations.
•
Pre-Defined Buffer Method:
With the sensor placed in
pH buffer whose value is contained in a buffer set that
you pre-selected, the analyzer automatically calibrates
that point without you having to enter its value. This
method can be used for single or two-point calibrations.
•
Sample Method:
With the sensor remaining in the proc-
ess, enter the known pH value of a grab sample whose
value was determined by laboratory analysis or a com-
parison reading. This method is only for single-point
calibrations.
•
Wash/Cal Method:
This method is dedicated for use only
with a GLI Cal-Clean™ System or other appropriate
automatic hardware that includes a positioner to re-
tract/insert the sensor, solution dispensing equipment,
and a solenoid control system.
After deciding which method to use, refer to the corre-
sponding subsection for more details. When performing the
calibration, refer to and follow the easy instructions shown
on the analyzer display screens.
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