Myron L 6Pfc and 4P - Manual (Page 22)

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4. Press to enter calibration mode. The “CAL”, “BUFFER”
and “7” annunciators will appear (see Figure 6, page 17).
Displayed value will be the uncalibrated sensor.
NOTES: If a wrong buffer is added (outside of 6-8 pH),“7” and “BUFFER”
will flash, and the Ultrameter II 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 Chart pg. 34) 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
is now complete. You may continue with pH gain Calibration or
exit by pressing any measurement key.
b. pH gain Calibration (6Pfc)
IMPORTANT: Always calibrate or verify your Ultrameter II 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).