Hach sensION3, Instruction Manual, Page: 29 / 52

29
SECTION 3,
continued
10. When the reading has been accepted, the standard number
will change to
3
.
11. Repeat steps 8 and 9 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
.
3.2.2 Calibrating With Other Buffers
1. If using a probe without a temperature sensor, see Sections
2.3.2 on page 20 and 2.6 on page 21 for information about
obtaining and using a default temperature.
2. Prepare two or three pH buffers according to the electrode
instruction manual.
3. Press the
I/O/EXIT
key to turn the instrument on. If necessary,
press the
P
H/mV
key to get into the pH reading mode (
pH
will
be displayed).
4. From the reading mode, press
CAL
. Functional keys will
appear in the lower left part of the display.
CAL
and
?
will
appear in the upper display area, along with
Standard
and
1
.
The numeric keypad will become active.
5. Place the pH electrode in the first buffer. Do not use a stir bar
or swirl or stir during pH measurements.
6. Enter the pH value of the buffer using the number keys and
press
ENTER
. A flashing underscore (
__
) indicates where the
next number will be placed. It is not necessary that all four
places have a number entered in them. Press
CE
to clear and
re-enter a value if a number entry error occurs.
7. The temperature and pH (or mV) value will be updated until a
stable reading is reached.