Oakton ION 5 Acorn Series, Operating Instructions Manual

Page: 5 / 12

6.
If you DO wish to calibrate to this point, press the ENTER key. The meter
will display the mV output of your electrode in the standard solution. Allow
the instrument to stabilize. Stabilization may take a few minutes depending
on electrode and standard concentration. Electrode response in low concen-
trations is much slower than response in high concentrations.
7. Press ENTER to confirm your calibration. The meter will move on to the
next standard (1.0 ppm).
8.
Follow steps 5-7 for each of the next calibration points. Make sure to rinse off
the electrode with deionized water before placing it in the next calibration
standard.
9.
After you have entered three calibration
points, the meter will display the average
electrode slope in mV.
See figure
You may compare this reading with the
expected slope value for your electrode from
your electrode manual to verify electrode
operation.
If you are only calibrating to two points,
you will need to press the
▲
(up arrow) key
until the slope is displayed.
If you want to leave the calibration mode
for any reason, press the CAL key to exit
the calibration mode. The meter will revert
back to the earlier calibration curve.
You must calibrate to at least two points in
order for calibration to take effect. If you only confirm the one calibration point, the
meter will display “Er2” when you exit calibration mode, and the meter will revert
back to the earlier calibration curve.
See figure
9 8
4. Calibration
Ion calibration
This instrument is capable of up to three-point ion calibration. Calibration values are
0.1, 1.0, 10.0 or 100.0. You must calibrate to at least two points. All calibration points
should be one decade apart. For example you may perform three point calibration to
0.1, 1.0 and 10.0, or two point calibration to 10.0 and 100.0. Do NOT perform two-
point calibration to 1.0 and 100.0 (meter will display “Er4”). For best accuracy,
calibrate your meter to points with similar concentrations to the solutions you
want to test.
Before you begin calibration, you must know whether the ion you are measuring is
mono or divalent. If you are uncertain, consult your ISE electrode manual, or your
OAKTON distributor.
1.
Prepare at least two calibration standards in accordance with the electrode
instructions or your approved methods. For best
results, make sure standards and samples are at
the same temperature
2.
Turn meter on. The ION 5 meter will automati-
cally enter the ion measurement mode.
See figure
3. Dip electrode into the first calibration standard.
Make sure to start with the calibration standard
that has the lowest concentration and move up
to the standards that have higher concentrations.
4.
Press CAL key to enter calibration mode. The
display will show CA1.
See figure
If you are measuring monovalent ions, press
ENTER to begin calibration.
If you are measuring divalent ions, press
MODE. The display will show CA2.
Press ENTER to begin calibration
See figure
5.
The first calibration point to appear is 0.1 ppm.
If you do NOT wish to calibrate to this point,
press
▲
(up arrow) to skip, and continue on to
the next calibration point.
4.1
A
A
B
B
mV
D
D
E
E
C
C