Endress+Hauser Liquiline To Go Ex CYM291 Operating Instructions Manual page 23

pH Calibration
FREE CAL Calibration
(Free selection of calibration method)
FREE CAL calibration is selected in the configuration menu.
Measurement
CAL
PROG. BUFFERS blinks
Perform the selected calibration (see PROG. BUFFERS, DATA INPUT or MANUAL
calibration).
Use st to select the required calibration
method (PROG. BUFFERS, DATA INPUT or
MANUAL).
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pH