Hanna-instruments HI 9829 Manuel d'utilisateur Page 41

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7.3 ISE CALIBRATION
From the “Calibration” menu select “Single
param. calibration” and then “ISE calibration”. The
display shows two options: “Calibrate ISE” and
“Restore factory calib”.
When an ISE replaces a pH sensor or another ISE
model, previous calibrations need to be
cleared using the <Restore factory calib.>
option first.
If “Calibrate ISE” is selected, the user can perform a single (10 ppm) or 2 point
calibration with standard 10 ppm and 100 ppm solutions.
If “Restore Factory Calib” is selected, all user calibration data will be deleted and
the default calibration is restored.
NotesNotes
NotesNotes
Notes The ppm tag will blink when a user calibration was not performed.
When a 2-point calibration is performed, all of the old data is overwritten, whereas
for a single point calibration the meter will also use information from the previous
calibration.
7.3.1 Preparation
Prepackaged standards are available in single use sachets. Rinse the ISE with
water and shake off excess water. The procedure always uses 10 ppm first.
7.3.2 Procedure
Cut open the 10 ppm sachet and pour a small quantity of standard over the ISE
tip to rinse the sensor. This should be done over a waste container. Immerse the
ISE sensor and temperature probe into the standard. Position the sachet to
ensure sensor membrane and ceramic junction are completely covered with
solution.
The current measurement or dashes,
temperature, the standard value and the “Not
ready” message are displayed.
Once the ISE has stabilized the countdown
timer will count down until the display shows
the “Ready” message.
Press <Confirm> to accept the calibration
point.
After the first calibration point is confirmed,
remove sensor from sachet packet and shake
standard off. Blot excess with a soft tissue. Cut
open the 100 ppm sachet. Immerse the ISE
sensor and temperature probe into the
standard.
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