User Guide

Instruction Manual pH 510/ Ion 510
9
3.2 Ion Concentration Calibration (For Ion 510 only)
The Ion 510 meter is capable of up to 3-point ion calibration (minimum 2 points) with choice of 4 options to
ensure accuracy across the entire measurement range. Note that the ion measurement mode accepts input of
only
± 500 mV. Ion calibration options include 0.10, 1.0, 10.0 or 100.0 ppm. All calibration should be at least one
decade apart from each other. For example you may perform 3 point calibration to 0.10, 1.0 and 10.0, or 2-
point calibration to 10.0 and 100.0. If 1-point calibration is performed an error message “Er2” is displayed. If
any of calibration points are not within 1 decade, an error message “Er4” will be displayed at the end of
calibration process.
Calibration values are successfully stored if the ISE slope is within the specified tolerance of 15mV/decade
(minimum) and 90mV/decade (maximum), otherwise an error message “Er3” is displayed (see Figure 7). The
calibration values are not stored into the meter’s built-in memory if any error message appears after each
calibration process. Re-calibration is necessary as calibration is unsuccessfully attempted in this instance.
Check that your ISE and standard solutions are in good working conditions.
Ensure that you use new or fresh standard solutions during calibration. Do not reuse ion standard solution as it
may be contaminated and affect the calibration and accuracy of measurements. Always store standard
solutions in a dry, cool environment if possible. Before use, remove plastic protective cap of ISE. Briefly rinse
the electrode with clean deionized water to remove any residues.
Rinse probes before and after each calibration or sample measurement to avoid cross-contamination. For
more details please refer to Manufacturer’s care and maintenance guide.
NOTE: The ion calibration values will be lost once power is disconnected; only pH and mV calibration
values will be retained.
Figure 5: 1st-point calibration
1. Connect an Ion Selective Electrode (ISE) to the BNC input connector
on the back of the meter. Turn the meter ON.
2. Press MODE key (if needed) to select ion measurement mode. If
there is no old calibration values, then the meter displays “---“ in the
upper display in measurement mode.
3. Dip the ISE 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.
Swirl it gently. Press CAL key to enter the ion calibration mode. The
[CAL] indicator appears above the upper display and the upper
display reads “0.10”. The lower display shows the corresponding
absolute mV value of sample measured.
4. The first calibration point of 0.10 ppm appears on the display. If you
DO NOT wish to calibrate to this point, press  (up arrow) to skip
and continue to the next calibration point of 1.0 ppm or 10.0 ppm.
5. If you DO wish to calibrate to 0.10 ppm, allow the mV reading to
stabilize. When the reading stabilizes the [READY] indicator will
appear on the display. Stabilization may take a few minutes
depending on electrode and standard concentration.
6. Press ENTER key to confirm your first point calibration (see Figure 5).
After calibration, the display will show the next calibration option, i.e.
1.0 ppm. Proceed by rinsing the electrode with deionized water
before placing it in the next calibration standard i.e. 1.0 ppm.
7. Allow the meter to stabilize in the next calibration standard. Wait for
the [READY] indicator to appear before you press the ENTER key to
confirm the second calibration point. The upper display flashes
momentarily then moves to the next calibration point of 10.0 ppm.
NOTE: If you are performing a 2-point ion calibration, press
CAL/MEAS key. “SLO” appears in the upper display with the [mV]
indicator and the number in the lower display is the electrode slope in
mV (see Figure 6). You are ready to take ion measurements. If the
slope is outside the acceptable limits or if incorrect standards have
been used the upper display will show “Er3” (see Figure 7).