Hach AutoCAT 9000 - Page 55

PAO/5.64 mN
PAO/5.64 mN
50081_PAONaThioCalibration.fm Page 53
9. Press 1 to select.
Run calibration to start the
calibration sequence.
Note: Last Calibration will
indicate the date of the
previous calibration.
10. Press the CHECK MARK
to change the User or press
1
to confirm.
Note: The user ID will be
stored in the GLP archives for
any future reference to this
calibration.
Note: This screen will be
skipped If User ID is disabled.
See Section 3.3.2 Setting a
User ID on page 27.
11. Highlight
Concentration.
Press the
CHECK MARK to
change the concentration or
proceed to step 12.
Note: Use a recent lot of
0.0282 N Iodine Standard
Solution for calibration.
Note: The default
concentration may be changed
to reflect standardization or the
“Certificate of Analysis” value
for a new bottle of titrant.
12. Highlight Lot No.
Press the
CHECK MARK to
change the titrant lot number
or proceed to step 13.
13. Highlight Volume for
Test
1.
Press the
CHECK MARK to
change the calibration
volume or proceed to
step 14.
Note: The default volume for
the standard solution has been
optimized for this embedded
calibration.
14. Prepare a calibration
sample.
a. Add 200 mL of DI-water
to a 250-mL glass beaker.
b. Using a Class A pipet, add
0.50 mL of recently
standardized iodine
solution.
c. Add 1 SwifTest
dispensation (0.1 g) of
potassium iodide (KI), and
1.0 mL of pH 4 acetate
buffer.
Press
1 to confirm.
15. Rinse the electrode,
temperature probe, and
anti-diffusion tip with
deionized water.
Insert the specified magnetic
stir bar into the calibration
sample and place it onto the
stirrer platform.
Lower the electrode head
onto the beaker rim.
Press
1 to confirm.
16. Press 1 to confirm the
displayed increment or
press the
CHECK MARK to
change the Increment.
Note: The default volume
increment has been optimized
for this embedded calibration;
it may be changed to suit
specific needs.