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

VII. CALIBRATION
A. Calibration Intervals
Generally, calibration is recommended about once per month with
Conductivity or TDS solutions. Calibration with pH solutions should
be checked twice a month. Calibration of ORP is not necessary (ref.
CALIBRATION INTERVALS, pg. 22).
B. Rules for Calibration of the Ultrameter II
1. Calibration Steps
a. Starting Calibration
Calibration is begun by pressing while measuring Conductivity, TDS
or pH. Measuring continues, but the “CAL” icon is on, indicating
calibration is now changeable.
The reading is changed with the and keys to match the known value.
The calibration for each of the 4 solution types may be performed in
either conductivity or TDS mode.
Depending on what is being calibrated, there may be 1, 2 or 3 steps to
the calibration procedures.
KCl, NaCl or 442 User
Cond Gain only Tempco, then Gain
Res Done in conductivity Done in conductivity or TDS
TDS Gain only Tempco, Ratio, then Gain
pH 7, acid and/or base (6PFC E )
ORP Zero set with pH 7 automatically (6PFC E )
Once in CAL mode, the key becomes an “ACCEPT” key. At
each point, pressing accepts the new calibration value and steps
you to the next adjustment (or out of CAL mode if there are no more
steps).
To bypass a calibration step, simply press
to accept the present
value as is.
b. Leaving Calibration
Calibration is complete when the “CAL” icon goes out. Pressing any
measurement key cancels changes not yet accepted and exits calibration
mode.
Leaving pH after the 2nd buffer results in the same gain being entered
in place of the 3rd buffer.
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