Thermo Fisher Scientific Alpha pH 800 - Manual (Page 19)

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5 MEASUREMENT
5.1 Display in Measurement mode
When the controller is initially powered on, it automatically enters into the
Measurement mode after the large dual LCD displays all segments briefly.
The upper display shows the measured pH or ORP value, while lower display
shows either temperature value if controller is set for pH measurement or “OrP”
if it is set for ORP measurement.
Annunciators at right side of display indicate whether controller is set for pH or
mV measurement.
Similarly annunciators or icons at top or left side of display shows current status
of controller, e.g. “MEAS”, “SETUP”, “CAL”, “READY”, etc. In addition, error
messages also guide user in time of any faulty conditions as indicated by “ERR”
or icons flashing.
5.1.1 Check electrode performance
To read current electrode slope and offset values:
1) Press CAL key followed by ENTER key. The upper display shows
electrode slope. The lower display reading shows the pH reading at 0 mV.
2) Press
Δ and ∇ keys to return to Measurement mode.