Thermo Fisher Scientific Alpha pH 550 User Manual
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Upper display shows the current uncalibrated pH reading. Allow the reading
to stabilize. LCD shows ‘READY’ annunciator when the reading is stable.
Press CAL key to confirm the reading.
3
The calibration is completed. The pH Monitor re-calculates electrode
properties based on the calibration. The new slope (in mV) is shown in the
upper display and pH reading at 0mV (pH7.00
± offset) is shown in the
lower display.
Press ENT key to exit from the calibration.
4
The pH Monitor reverts to pH measurement mode.
NOTE:
Refer notes at the end of this section for additional
information and possible error indicators of calibration
process
2-Point Calibration:
CAL
ENT
CAL
mV
pH
MEAS
PH
°C
ATC
READY
ENT
1
2
4
CAL
pH
READY
pH
CAL
pH
READY
pH
ENT
CAL
pH
READY
pH
CAL
pH
READY
pH
CAL
pH
READY
pH
3
3
3
3
5
ENT
CAL
ENT
CAL
ENT
CAL
ENT
CAL
1
1
From pH measurement mode press CAL key to enter calibration mode as
described in section 4.2. The LCD shows ‘CAL PH’. Press ENT key to
begin first calibration point.
2
Place the electrode in pH 7.00 buffer. Immerse the temperature probe in
the buffer solution if ATC mode is enabled. Immerse the potential matching
pin in the buffer if symmetrical mode is enabled. The buffer annunciator
appears in LCD. Lower display shows pH 7.00 (USA standard buffer).
Upper display shows the current uncalibrated pH reading. Allow the reading
to stabilize. LCD shows ‘READY’ annunciator when the reading is stable.