Myron L 9PTK - Manual (Page 30)

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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 TABLE under Calibration Steps below).
B. Rules for Calibration of the Ultrameter III
1. Calibration Steps
The following table lists measurement functions and their corresponding
calibration requirements:
CALIBRATION INTERVALS TABLE:
Function Kcl, nacl or 442 User
Cond gain Only Tempco, then gain
Res Done in Conductivity Done in Conductivity
TDS gain Only Tempco, Ratio, then gain
pH 7, acid and/or base
ORP Zero set with pH 7
automatically
Alkalinity gain Only
Hardness gain Only
a. Starting Calibration
For Alkalinity and Hardness, calibration is begun by pressing
when the titration is complete and a value displays.
For Conductivity, TDS or pH, 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.
Once in CAL mode, the key becomes an “ACCEPT” key for the
new calibration.
For pH, at each point, pressing accepts the new calibration
value and steps you to the next adjustment.