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

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e. Press once to confirm new value and end the
calibration sequence for this particular solution type.
3. Resistivity Calibration
Resistivity is the reciprocal of Conductivity. To calibrate resistivity,
calibrate conductivity for the solution type you wish to measure (ref.
Conductivity or TDS Calibration, pg. 16).
4. Reloading Factory Calibration (Cond or TDS)
If calibration is suspect or known to be incorrect, and no standard solution
is available, the calibration value can be replaced with the original factory
value for that solution. This “FAC” value is the same for all Ultrameter IIs,
and returns you to a known state without solution in the cell. The “FAC”
internal electronics calibration (which bypasses the electrodes and cell)
is not intended to replace calibration with conductivity/TDS standard
solutions. If another solution type requires resetting, change solution
type and repeat this procedure.
a.
Press or .
b. Press . (If in User solution mode. Press CAL key
twice if in Conductivity, and three times if in TDS to skip over
tempco and ratio adjustments.)
c. Press key until “FAC” appears and release.
d. Press to accept the factory calibration setting.
5. pH Calibration (6Pfc)
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 (6Pfc)
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
Figure 6
BUFFER
pH
CAL
pH calibration. If the display
shows 7.00, skip the pH
Zero Calibration and
proceed to section b. pH
Gain Calibration.