Thermo Fisher Scientific Alpha pH 190 (In the process of updating the brand guideline & product image) - Manual (Page 34)

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9.9 Controller Reset – P6.0
This parameter lets you reset the controller. All pH and ORP
calibration data will be cleared, and all Setup parameters revert to
factory default values. Temperature mode (ATC or MTC) and
calibration data remains unchanged.
P6.0
RsT n0
yeS
P6.1
Press ▲ and ▼ keys together (ESCAPE) at anytime, to leave the
Setup mode and return to Measurement mode.
P6.0: Controller reset
1.
Key in the password “022” as per procedure in Section 5.
2. Press ▲ key five times. The screen will scroll P6.0 and RST.
Press ENTER.
3. The screen will scroll P6.1, then NO.
4. Press ▲ or ▼ keys to toggle between YES and NO. Pressing
YES will clear all calibration data and setup parameters!
5. Press ENTER to confirm selection and return to general Setup
mode.
Press ▲ and ▼ keys together (ESCAPE) to return to
measurement mode.