Thermo Fisher Scientific Alpha pH 190 (In the process of updating the brand guideline & product image) - Manual (Page 21)

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7 ORP CALIBRATION
IMPORTANT: When Calibration mode is entered, controller
automatically goes into a “HOLD” mode where the 4-20 mA output
freezes and relays are de-activated (if it was in an activated
condition). Upon return to measurement mode, both 4-20mA output
and relay activities resume, depending on settings.
mV (ORP) values may be offset at up to ±150 mV to agree with a
calibration solution or an established work standard.
1. Press CAL / ENTER key to directly access the Calibration
mode when the unit is in ORP measurement mode.
NOTE: Instead of pressing the CAL/ENTER key, you can also enter
the Calibration mode using the password code procedure as
explained in Section 5.
2. Controller will blink with un-calibrated mV output of your
electrode.
3. Determine the mV value of your solution with an accurate
meter (such as the pH 6).
4. Press the ▲ or ▼ keys to offset the mV value on the controller
display to match the value of the solution you are measuring.
5. Press ENTER. The display flashes “DONE”. Press ENTER
again to return to measurement mode.
NOTE: You can view the mV offset in the Setup program, P5.0.
180
200
done
ENTER