Thermo Fisher Scientific Eutech pH 700/Ion 700 - Manual (Page 10)

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1) Connect the ISE and press as needed to select ppm. Note: The
primary reading will show “- - - -” without a stored ion calibration. The
secondary value is the corresponding mV reading of the ISE.
2) Dip the ISE into your lowest standard solution value and stir. Press
when the secondary reading is stable.
3) Press or to match the primary display to your corresponding
ion calibration value (0.10, 1.0, 10, etc).
4) Press to accept or to abort. The primary display will show the
next highest calibration standard value.
5) Rinse the ISE then dip into the corresponding calibration standard
and stir.
6) Press to accept or to cancel. The mV/decade slope value will
be displayed briefly if the calibration is successful. “SLP Err” indicates
that the calibration for the current point was not successful. This occurs
when the slope (mV difference between two consecutive points) is
lower than 15mV/decade or higher than 90mV/decade.
7) Revert to step 3) to calibrate additional points or press as needed
to return to measurement mode at any time. Note: The meter will
automatically return to measurement mode upon successful completion
of the number of specified calibration points. To change the number of
ion calibration points see Section 5.6.