Nova-Tech Ion 6+ - Manual (Page 10)

Instruction Manual pH 5+, pH 6+, Ion 6+
-7-
3. CALIBRATION
3.1 pH Calibration
The meter is capable of calibrating up to 3 pH values using USA or NIST (nSt) pH buffer
standards or 2 pH values with Low Ionic (Pb) pH buffer standard. All new calibration
values will automatically override existing data.
USA group 4.01, 7.00, 10.01
NIST group 4.01, 6.86, 9.18
Pb group 4.10, 6.97
For best results perform at least a 2-point calibration at room temperature (25 o C) using
standard buffers. Begin with pH 7.00 (USA group), pH 6.86 (NIST group) or pH 6.97 (Pb
group).
For a 1-point calibration, calibration should be performed with a pH buffer value closest
to the expected sample value being measured.
The meter has automatic buffer recognition that identifies the correct pH buffer values
during calibration. The meter will accept calibration values that are within +/-1.0 pH units
of the expected value, otherwise the LCD will flash “Er1” and the value will not be
accepted. Press CAL to abort calibration and resume measurement.
Always use new pH buffer solutions for calibration. Do not reuse buffer solutions as it
may be contaminated and affect the calibration and accuracy of measurements.
Promptly seal containers and store solutions in a dark, dry, cool environment.
Before use, remove the plastic protective cap of pH electrode and condition the glass
bulb by soaking it in tap water or pH buffer (preferably pH 4) for 1-2 hours. This hydrates
the glass bulb if the electrode is too dry or has not been used recently. Always rinse the
probes with clean water before and after each calibration/sample measurement to avoid
cross-contamination. For details refer to section 5 on Electrode care and maintenance.
3.1.1 pH Calibration Procedure
1. Pour known pH buffer calibration standard solution into a clean, dry container, e.g.
pH 7.00. Turn on meter and select pH mode by pressing MODE key if necessary.
2. Dip the pH electrode and temperature probe into the solution. Swirl gently and wait
for reading to stabilise (approx. 30 seconds depending on your electrode condition).