Myron L 9PTK - Manual (Page 38)

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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. 52) 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
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.