Myron L 9PTK - Manual (Page 37)

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A hardness value will display when the titration measurement
is complete.
24. Press cal. The “cal” icon will display.
25. Adjust the displayed value to “200” using UP or DOWN key. The
unit will not allow you to scroll up or down to “200” if it is beyond
±10% of the reading. Ref. Total Return to Factory Settings “Fac
sel”, pg. 41 to reset the Hardness Calibration to the “Fac”
setting along with all other calibrations.
26. Press cal to accept.
The unit will automatically power off after the period of inactivity
defined in the AUTO OFF setting (ref. AUTO OFF, pg. 43).
7. pH Calibration
imPOrtant: Always “zero” your Ultrameter III with a pH 7 buffer
solution before adjusting the gain with acid or base buffers, i.e., 4 and/
or 10, etc.
a. pH Zero Calibration
1. Rinse sensor well and cell cup 3 times with 7 buffer solution.
2. Refill both sensor well and cell cup with 7 buffer solution.
3. Press to verify the pH calibration. If the display shows
7.00, skip the pH Zero Calibration and proceed to section b.
pH gain Calibration.
4. Press to enter calibration mode. The “cal”, “bUFFer”
and “7” annunciators will appear (see Figure 6). Displayed
value will be the uncalibrated sensor.
nOte: If a wrong buffer is added (outside of 6-8 pH), “7”and “bUFFer”
will flash, and the Ultrameter III will not adjust. The uncalibrated pH
value displayed in step 4 will assist in determining the accuracy of the
pH sensor. If the pH reading is above 8 with pH 7 buffer solution, the
sensor well needs additional rinsing or the pH sensor is defective and
needs to be replaced.