Thermo Fisher Scientific Eutech pH 5/6 Plus & Ion 6 Plus (New version R1.1, SN >797406) - Manual (Page 9)

Instruction Manual pH 5+, pH 6+, Ion 6+
pH Calibration Procedure
1. Turn on the meter and select pH mode by pressing if necessary.
2. Press to begin pH calibration mode. “
” (calibrate) will display briefly. Notice
that the pH reading and “pH” annunciator will both blink.
3. Pour pH buffer calibration standard solution into a clean, dry container and dip your
pH electrode and temperature probe in the solution. Swirl gently or stir and wait for
reading to stabilize (approx. 30 seconds depending on your electrode condition).
4. When the pH reading has stabilized, the pH annunciator will stop blinking. Press
to confirm the value. “
” (confirm) will display briefly. The pH value is
automatically adjusted to the buffer value shown from your selected buffer group.
The example below shows a successful pH 7.00 calibration at 25 °C.
5. For a one-point calibration with pH 7.00 or pH 6.86 only, press to return to
measurement mode. However for highest accuracy—perform a multiple-point
calibration. Repeat steps 3 & 4 with additional pH buffer calibration standards.
When you have completed the preset number of calibration points, the meter will
automatically save the calibration, cease blinking, and begin pH measurement.
Q: My meter, electrode & buffers are new—why does my pH 10 buffer read “10.06”?
A: Temperature influences pH. While pH 10 buffer is 10.00 at 25 °C / 77 °F, at
20 °C / 68 °F it is actually 10.06! This is why it is always best to record the temperature
as well as the pH reading!
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