Operational Guide
24
pH
Calibration
Note
: Custom buffer values can be adjusted ±1.00 pH around the set
value during calibration. When a custom buffer 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 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 22.
Press
CAL
. Place sensor in desired buffer and select buffer 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 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.
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 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
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 .
www.
.com
1.800.561.8187