Myron L Ultrameter 6P, Operation Manual

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b. Refill conductivity cell with same standard.
c. Press or , then
press , “ CAL ” icon will
appear on the display (see Fig. 5).
d. Press or to step the displayed value toward the
standard’s value or hold a key down to cause rapid scrolling of the
reading.
e. Press once to confirm new value and end the calibration
sequence for this particular solution type.
If another solution type is also to be measured, change solution type now
and repeat this procedure.
2. User Calibration Conductivity/TDS
Instrument must be in U S E R mode, see Section V. Solution Selection,
page 11.
a. Rinse conductivity cell three times with your standard.
b. Refill conductivity cell with same standard.
c. Press or , then press twice in COND/three
times in TDS. The “ CAL ” icon will appear on the display.
d. Press or to step the displayed value toward the
standard’s value or hold a key down to cause rapid scrolling of the
reading.
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. Resistivity is calibrated only if
conductivity is calibrated for the same solution type.
16
M S
MR
COND
T D S
CAL
MCLR
CAL
MCLR
COND T D S
CAL
MCLR
M S
MR
CAL
MCLR
°C
CAL
µ S
COND
4 4 2
Figure 5
4. Reloading Factory Calibration (Cond or TDS)
If calibration is suspect or known to be wrong, 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 Ultrameters,
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 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
Important : Always “zero” your Ultrameter 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
1. Rinse sensor well 3 times with 7 buffer solution.
2. Refill sensor well with 7 buffer solution.
3. Press to verify the pH
calibration. If the display
reads 7.0, 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
17
pH
CAL
MCLR
CAL
MCLR
COND
T D S
CAL
MCLR
M S
Figure 6
pH
BUFFER
CAL