Thermo Fisher Scientific Alpha pH 800 - Manual (Page 23)

16
7 ADVANCED SET UP MODE
7.1 Electrode Offset (OFS) sub-function
This option is available only in the pH mode. An allowance of
±120mV is allowed
to correct for electrode deviations. This feature is useful for prolonged on-line
applications.
The controller will add or subtract the value from the measured pH and display
the correct value. Should the offset value be too high, consider performing
maintenance on the electrode followed by calibration. If the calibration is
unsuccessful, please replace the electrode.
1) Take a sample from the system and note pH reading
displayed on controller.
2) Measure pH of sample using a calibrated pH tester,
hand-held meter, or bench meter. Record the correct pH
value.
3) Enter Advanced set-up mode. Press ENTER.
4) Press
Δ or ∇ keys to scroll until upper display shows
OFS.
5) Press ENTER key. The SETUP annunciator appears at the top of display.
Lower display shows on-line measured pH value. Upper display shows current
offset value.
6) Press
Δ or ∇ keys until pH value coincides with correct pH value noted in
Step 2. As the
Δ or ∇ keys is pressed to adjust pH value, the ‘offset’ value in
upper display also changes.
7) Press ENTER key to enter offset value.
SETUP
SETUP
HOLD
HOLD
Ofs
-0.05
7.00