Myron L 9PTK with FCE Free Chlorine - Manual (Page 39)

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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.
5. Press or until the display reads “7.00”.
nOte: Attempted calibration of >1 pH point from factory calibration will
cause “Fac” to appear. This indicates the need for sensor replacement
(ref. Troubleshooting pg. 54) or fresh buffer solution. The “FAC” internal
electronic calibration is not intended to replace calibration with pH
buffers. It assumes an ideal pH sensor Each “FAC” indicates a factory
setting for that calibration step (i.e., 7, acid, base).
You may press to accept the preset factory value, or you may
reduce your variation from factory setting by pressing or .
6. Press to accept the new value. The pH Zero Calibration