Oakton ION 5 Acorn Series, Operating Instructions Manual

Page: 6 / 12

11 10
pH buffer set selection (ION 6 meter only)
The ION 6 meter is capable of up to three-point pH calibration to ensure accuracy
across the entire range of the meter. The ION 6 meter can be set to recognize either
of two buffer sets: USA or NIST buffers.
USA —“USA”: 4.01; 7.00 and 10.01
NIST –“nSt”: 4.01, 6.86, and 9.18
To choose your buffer set:
1. Turn meter OFF. Meter must be OFF in order to
access buffer selection.
2.
While holding down the MODE key, press
the ON/OFF key momentarily. Continue to
hold the MODE key until the display flashes
“buF”.
See figure
3.
Press the ENTER key to enter buffer set
selection mode. The display will flash
“USA”
See figure
4.
Press the MODE key to toggle between the
available buffer sets. The display will flash
“USA” or “nSt” as you toggle between
the sets
5.
Press ENTER key to confirm the buffer set
you wish to use. Proceed with calibration
in section 4.3
pH calibration (ION 6 meter only)
We recommend you perform at least a 2-point calibration at room temperature using
standard buffers that bracket (one above and one below) the expected sample range.
You can also perform a 1-point calibration, but make sure that the buffer value is
close to the sample value you are measuring.
All new calibrations will over-ride existing data.
NOTE : Do not reuse buffer solutions after calibration. Contaminants in the
solution can affect the calibration, and the accuracy of the measurements.
Before use: remove the electrode soaker bottle. If the electrode has been stored dry,
condition the glass bulb by soaking it in tap water for 30 minutes. This hydrates the
glass bulb if the electrode is too dry, or has not been used for a long period of time.
1.
Turn meter on. Meter will automatically enter ion measurement mode. Press the
MODE key until display shows “pH” in the upper right corner.
2.
Rinse electrode thoroughly with deionized water or a rinse solution.
DO NOT wipe the electrode;
this causes a build-up of electrostatic
charge on the glass surface.
3. Dip both the electrode and temperature sensor into pH 7.00 (or 6.86 in NIST set)
buffer solution. The glass bulb must be completely immersed into the sample.
Stir gently, and wait for reading to stabilize (approximately 40 seconds).
4. Press CAL key to enter the calibration mode.
The display will momentarily flash “CA” to indicate CAlibration.
See figure
The display will then show the current
noncalibrated reading, blinking while in
calibration mode.
See figure
5.
Allow the reading to stabilize. The meter
automatically recognizes 7.00, 4.01 or 10.00
buffers (or 4.01; 6.86 and 9.18 in NIST set).
6.
Press ENTER key once to confirm calibration.
The LCD displays “CO” to indicate the
calibration point has been confirmed. The
meter exits calibration mode and returns
to measurement mode.
7.
Repeat with pH buffers 4.01 and/or 10.00
( or 6.86/9.18) for best accuracy.
4.2
A
B
pH
A
B
4.3
A
B
A
B