Operational Guide
24
pH
Calibration
Note: Custom bu er values can be adjusted ±1.00 pH around the set
value during calibration. When a custom bu er is displayed, the “C1” or “C2”
tag is displayed.
First Calibration Point
When performing a new calibration, or adding to an existing one, the user has
a choice of how the rst new calibration point will be treated in reference to
the existing calibration point. This is selected in SETUP by the option FIRST
CALIBRATION POINT. The two SETUP selectable options are “POINT” or “OFFSET”.
Point: A bu er value can be recalibrated and added to the previous calibration
set. The electrode slope of the other calibration points will be reevaluated with
the recalibrated bu er value.
O set: The new bu er calibration point can create a constant o set to all
existing pH calibration data (existing calibration must have a minimum of two
pH bu ers)
.
Recalibrating a pH sensor or adding to an existing calibration is simple and
follows the PROCEDURE outlined on page 22.
Press CAL. Place sensor in desired bu er and select bu er from choices. When
sensor has equilibrated, the CFM tag will turn on and blink. Press the CFM key.
Press CAL to escape the calibration. Alternately continue calibrating in
additional bu ers. The latest calibration point will be added to the existing data.
GLP will re ect the latest calibration data. Older calibration bu ers will be seen
as blinking bu ers.
Note: Each time a bu er is con rmed, the new
calibration data replaces the old data for the
corresponding bu er or for any bu er in the proximity
of ±0.2 pH. If the current bu er has no previous data
stored and the calibration has not used ve bu ers,
the current bu er is added to the existing calibration.
If the existing calibration is full, the instrument asks
which bu er to replace.
Note: When using Standard mode, the user can choose if they want the display
to show the CONDITION and RESPONSE gauges on the display. These are part of
the Cal Check™ system and are selected in SETUP by the option INFORMATION.
The choice is ON or OFF.
Electrode Condition and Electrode Response Time
edge
pH
® pH Calibration Check™ feature will assess electrode condition and
response time during each calibration and display it for the rest of the day.
The condition gauge shows the electrode’s condition that is based on the o set
and slope characteristics of the pH electrode at the time of calibration. The
response gauge is a function of the stabilization time between the rst and
second calibration bu ers, when calibration is performed between a pair of
4.01, 7.01, or 10.01 bu ers. These gauges re ect the electrode’s performance
and should be expected to slowly decrease over the life of the electrode .
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