Hach sensION3, Instruction Manual, Page: 30 / 52

30
SECTION 3,
continued
8. When the reading has stabilized, the standard number will
change to
2.
If measuring in the mV mode, press
ENTER
to continue.
9. Rinse the electrode and place it in the next buffer.
10. Enter the pH value of the buffer using the number keys as
described above. Press
ENTER
.
11. Repeat steps 8–10 for the third buffer or press
EXIT
if using
two buffers. In either case, the slope value and the
Store
and
?
icons will appear. Verify the slope value is within the ranges
specified in the electrode manual.
12. To save the calibration and return to the reading mode, press
ENTER
. To exit the calibration without saving it and return to
the reading mode, press
EXIT
.
3.2.3 One-Point Calibration
The one-point calibration is used to adjust the slope offset and
cannot be done unless a prior two or three point calibration has
been done.
1. Press
CAL
.
Cal
,
1
,
?
, and
Standard
will be displayed.
2. Place the electrode in an auto-recognizable pH buffer. or any
other buffer and manually enter the pH value.
3. Press
READ/ENTER
. The temperature and pH values will be
continuously updated until a stable reading is reached.
4. When the reading has stabilized, the standard number will
change to
2
.
5. Press
EXIT.
The adjusted offset value, the slope, and the
Store
and
?
icons will appear. Verify the offset value (isopotential
point) is within the range specified in the electrode manual.
6. To save the adjusted calibration and return to the reading
mode, press
ENTER
. To exit the calibration without saving it
and return to the reading mode, press
EXIT
.