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First Calibration Point
When performing a new calibration, or adding to an existing one, the user has a choice of how the
first 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 buffer 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 buffer value.
Offset: The new buffer calibration point can create a constant offset to all existing pH calibration data
(existing calibration must have a minimum of two pH buffers).
Recalibrating a pH sensor or adding to an existing calibration is simple and follows the PROCEDURE
outlined on page 26.
Press CAL/MODIFY key. Place sensor in desired buffer and select buffer from choices. When sensor
has equilibrated, the “CFM” tag will turn on and blink. Press the GLP/CFM key.
Press CAL/MODIFY key to escape the calibration. Alternately continue calibrating in additional
buffers. The latest calibration point will be added to the existing data. GLP will reflect the latest
calibration data. Older calibration buffers will be seen as blinking buffers.
Note: Each time a buffer is confirmed, the new calibration data
replaces the old data for the corresponding buffer or for any
buffer in the proximity of ±0.2 pH. If the current buffer has
no previous data stored and the calibration has not used five
buffers, the current buffer is added to the existing calibration. If
the existing calibration is full, the instrument asks which buffer
to replace.
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 offset and slope characteristics
of the pH electrode at the time of calibration. The response gauge is a function of the stabilization
time between the first and second calibration buffers, when calibration is performed between a pair
of pH 4.01, 7.01, or 10.01 buffers. These gauges reflect the electrode’s performance and should be
expected to slowly decrease over the life of the electrode .
OPERATIONAL GUIDE
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