Thermo Fisher Scientific Alpha pH 200 (In the process of updating the brand guideline & product image) User Manual
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If you are performing 1-point calibration, press ▲/▼keys together to return to
measurement mode. If you are performing two-point calibration, proceed with the
next step.
7.
Use ▲/▼keys to select the next buffer value (pH 1.68, 4.01, 9.18, 10.01
and 12.45).
8.
Make sure the electrode is in the correct buffer solution. Allow the electrode
time to stabilize.
9.
Press ENTER. The instrument blinks with the uncalibrated pH value
corresponding to the mV output of your pH probe.
10. Press ENTER to confirm the buffer value. The display blinks the calibrated
value twice and flashes “DONE”. Press the ENTER again to return to
measurement mode.
NOTE: Buffer must be within ±1.0 pH of the value you are calibrating to, or Err1
will display. To clear the Err1 display and return to calibration mode, press
▲/▼keys together.
Notes:
You can view the pH calibration points in the Setup program. See Setup program
P5.0.
The slope and offset are re-determined after each calibration.
If the value displayed in steps 5 and 9 differ substantially from the buffer value, this
indicates electrode drift. Consider replacing your electrode.