Thermo Fisher Scientific Alpha pH 600 RF (In the process of updating the brand guideline & product image) - Manual (Page 34)

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11 From pH measurement mode press ENT key to enter setup mode as
described in section 5.1. The LCD shows the first screen of setup mode
(OFS). Press ▲ or ▼ key to select buffer settings screen (bUFF).
Press ENT key to access buffer settings (bUFF).
2 Selecting buffer group: The lower display shows the last configured
buffer group. Press ▲ or ▼ key to select the required buffer group (‘USA’
or ‘nST’).
Press ENT key to confirm your selection. The pH Transmitter reverts to
bUFF screen.
NOTE: To exit from any intermediate steps, press ▲ and ▼ keys (Escape)
together. It will return to measurement mode.
5.5 Configuration Settings
Configuration settings let you configure the pH Transmitter to different
measurement & operation modes & reset the pH Transmitter to factory defaults.
Asymmetrical Operation Mode (ASY):
This is the default mode of operation of the pH Transmitter, which is suitable for
most applications where sample (or process) liquid is not interfered by adjacent
electrical noise.
Symmetrical Operation Mode (SY):
This is the mode of operation is recommended for applications where sample (or
process) liquid is subjected to high electrical interference and therefore the pH
reading becomes unstable. When the pH Transmitter is set to symmetrical mode,
you should immerse the potential matching pin in the sample (or process) liquid or
use a pH electrode with built-in potential matching pin. The ‘MEAS’ indicator blinks
when the pH Transmitter is set to Symmetric mode.