
Instruction Manual
α
lpha-pH 550
Eutech Instruments
16
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
From pH measurement mode
press CAL key
to enter calibration mode
as described in section
1
1
4.2. The LCD shows ‘
CAL PH
’.
Press ENT key
to begin first calibration point.
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
2
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.
Press ENT key
to confirm the reading.
The pH Monitor moves to the second calibration point. The lower display
shows next standard buffer value (pH 4.01).
Use
▲
and
▼
keys
to
select your second buffer from one of the preset values: pH 4.01 or 1.68
or 10.01 or 12.45. Remove the electrode from the first buffer, rinse and
then immerse it into the second buffer. Allow the reading to stabilize.
LCD shows ‘
READY
’ annunciator when the reading is stable.
3
Press ENT key (or CAL key)
to confirm the reading.
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.
4
Press ENT key
to exit from the calibration.
The pH Monitor reverts to pH measurement mode.
5
5