Point Calibration - Thermo Scientific ALPHA PH 550 Manual

1-Point Calibration:

1
CAL
HOLD
From pH measurement mode press CAL key to enter calibration mode as
1 1
described in section 4.2. The LCD shows 'CAL PH'. Press ENT key to
begin calibration.
Place the electrode in pH 6.86 buffer. Immerse the temperature probe in the
2
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 6.86 (NIST standard buffer).
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.
The calibration is completed. The pH Monitor re-calculates electrode
3
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.
The pH Monitor reverts to pH measurement mode.
4
2-Point Calibration:
1
CAL
ENT
CAL
ENT
READY
HOLD
2
CAL
pH
ENT
READY
pH
2
CAL
CAL
pH
HOLD
pH
3
CAL
pH
ENT
READY
CAL
pH
3
CAL
ENT
pH
READY
CAL
pH
3
CAL
ENT
pH
READY
CAL
pH
3
CAL
ENT
pH
READY
CAL
pH
- 20 -
3
mV
MEAS
ENT
READY
pH
4
mV
CAL MEAS
ENT
READY
pH
4
PH
°C
ATC
5
PH
°C
ATC