Nova-Tech pH 110 - Manual (Page 15)

Instruction Manual CyberScan pH 11 / 110
11
4 CALIBRATION
4.1 Important Information on Meter Calibration
When you re-calibrate your meter, previous pH and Relative mV calibration points
are replaced on a point by point basis. For example, if you previously calibrated your
meter at pH 4.01, 7.00, and 10.01, and you have now re-calibrated at pH 7.00, the
meter retains the old calibration data at pH 4.01 and pH 10.01. To view current
calibration points, see section 9.3 - P2.0: Viewing Previous Calibration Data on page
38.
To completely re-calibrate your meter, or when you use a replacement probe, it is
best to set the meter to its factory defaults and re-calibrate the meter at all points. To
reset the meter to its factory defaults, see section 9.6.2 - User Reset on page 43.
4.2 Preparing the Meter for Calibration
Before starting calibration, make sure you are in the correct measurement mode.
When you switch on the meter, the meter starts up in the units last used. For
example, if you shut the meter off in “mV” units, the meter will read “mV” units when
you switch the meter on.
Be sure to remove the protective electrode storage bottle or rubber cap of the
electrode before calibration or measurement. If the electrode has been stored dry,
wet the electrode in tap water for 10 minutes before calibrating or taking readings to
saturate the pH electrode surface and minimise drift.
Wash your electrode in deionised water after use, and store in electrode storage
solution. If storage solution is not available, use pH 4.01 or 7.00 buffer solution.
Do not reuse buffer solutions after calibration. Contaminants in the solution can affect
the calibration, and eventually the accuracy of the measurements. See section 15.3 -
Calibration Solutions on page 67 for information on our high-quality pH buffer
solutions.
It is recommended that you perform at least a 2-Point Calibration using standard
buffers that adequately cover the expected measurement range prior to
measurement. 1-Point Calibration can also be used for quick measurements. Make
sure that the calibration point is close to the sample value to be measured.
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