Myron L 9PTK with FCE Free Chlorine - Manual (Page 40)

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is now complete. You may continue with pH gain Calibration or
exit by pressing any measurement key.
b. pH gain Calibration
imPOrtant: Always calibrate or verify 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. Either acid or base solution can be used for the
2nd point “gain” calibration and then the opposite for the 3rd point. The
display will verify that a buffer is in the sensor well by displaying either
“acd” or “bas”.
1. The pH calibration mode is initiated by either completion of the
pH Zero Calibration, or verifying 7 buffer and pressing the
key twice while in pH measurement mode.
2. At this point the “cal”, “bUFFer” and “acd” or “bas”
annunciators will be displayed (see Figures 7 and 8).
Figure 8
pH
BUFFER
CAL
nOte: If the “acd” and “bas” indicators are blinking, the unit is indicating an
error and needs either an acid or base solution present in the sensor well.
3. Rinse sensor well 3 times with acid or base buffer solution.
4. Refill sensor well again with same buffer solution.
5. Press or until display agrees with buffer value.
6. Press to accept 2nd point of calibration. Now the
display indicates the next type of buffer to be used.
Single point gain Calibration is complete. You may continue for the 3rd
point of Calibration (2nd gain) or exit by pressing any measurement key.
Exiting causes the value accepted for the buffer to be used for both acid
and base measurements.