Thermo Fisher Scientific Alpha pH 800 - Manual (Page 20)

13
6 CALIBRATION
Direct Calibration from Measurement mode is possible via the CAL key.
Calibration procedure can also be accessed from Advanced Setup mode.
6.1 pH Calibration
This unit features five preset buffer values (1.00, 4.00, 6.86 or 7.00, 9.00, 9.18
and 10.00) for quick, two-point auto calibration. When calibrating this instrument,
standard pH buffer solutions must be used.
1) Enter Calibration mode. While in
Measurement mode, push CAL key. Upper and lower
display reads “CAL” & “pH”. Push ENTER or CAL
key again. The controller displays electrode status
based on previous calibration. Electrode slope and
offset information is displayed.
NOTE: If display reads “CAL OrP”, see section 7.4
for procedures on how to switch from ORP to pH
readings.
2) Press ENTER key again to begin calibration.
The “CAL” indicator appears at top of display and
buffer indicator appears in bottom left corner of
display. Upper display is on-line pH value as
measured by electrode. Lower display indicates the
first compulsory calibration value, pH 7.00 (or
6.86).
Immerse clean electrode in buffer solution. In
ATC, temperature probe must also be immersed
in buffer solution. Likewise for symmetrical
mode, immerse potential matching pin in buffer.
HOLD
6.96
pH
7.00
pH
CAL
4.02
pH
4.00
pH
SETUP
HOLD
CAL
59.0
mV
7.00
pH
READY
HOLD
CAL
CAL
PH
SETUP
HOLD
57.2
mV
6.88
pH
READY
HOLD
CAL