Thermo Fisher Scientific Alpha pH 800 - Manual (Page 21)

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3) Press ENTER key to start calibration at pH 7 (or pH 6.86). The electrode
indicator and CAL indicator both flash. The controller automatically adjusts
reading to match the buffer value.
4) The lower display will now show its next lower ‘pH’ buffer. Use
Δ and ∇ keys
to select second buffer from one of 5 remaining preset values. Remove
electrode from first buffer, wash and then immerse into second buffer. Once
upper display stabilises press ENTER key, electrode and CAL indicator will
flash. The controller adjusts reading to the buffer.
5) After calibrating to a second buffer value, controller automatically displays
electrode slope and offset. The zero point and slope are re-determined after
each calibration.
6) Press ENTER key. If calibration mode was accessed using CAL key,
controller will return to Measurement mode. If calibration mode was accessed
from Advanced Set-up mode, controller will return to sub-function menu.
Note: If there is a calibration error, controller displays “ERR”. If this happens,
push both
Δ and ∇ keys
(escape) to restart calibration beginning from step 1.
Note: When calibrating with manual temperature compensation, controller
automatically changes from preset process temperature to calibration
temperature. After leaving Calibration mode, controller switches back to process
temperature (for setting calibration temperature and process temperature, see
section 7.2.3).