Myron L 6P and 4P - Manual (Page 21)

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5. pH Calibration (6P)
Important: Always “zero” 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.
a. pH Zero Calibration (6P)
1. Rinse sensor well 3 times with 7 buffer solution.
2. Refill both sensor wells
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.
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 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
Figure 6
BUFFER
pH
CAL