Nova-Tech pH-Dissolved Oxygen Meter - Manual (Page 6)

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For directions on how to calibrate your meter:
• See sections 4.2-4.3 on pages 11-13 for pH calibration
• See section 4.4-4.5 on page 14-16 for % saturation calibration
• See section 4.4 and 4.6 on page 14, 17-18 for mg/l (ppm) calibration
• See section 4.7 on pages 19 for Temperature Calibration
Preparing the Meter for pH Calibration
Before starting pH 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 "pH" units, the meter will read "pH" units
when you switch the meter on.
Do not reuse pH calibration solutions after calibration. Contaminants in the solution
can affect the calibration, and eventually the accuracy of the measurements. See
pages 64-65 for information on our high-quality pH calibration solutions.
Be sure to remove the protective rubber cap from the pH electrode before
calibration or measurement. If the electrode has been stored dry, wet the probe in
tap water for 10 minutes before calibrating or taking readings to saturate the pH
electrode surface and minimize drift.
Wash your probe in deionized water after use, and store in electrode storage
solution. If storage solution is not available, use pH 4.0 or 7.0 buffer.
The pH/DO 300 meter is capable of up to 5-point pH calibration at pH 1.68, 4.01, 7.00,
10.01, and 12.45 to ensure accuracy across the entire pH range of the meter . The meter
automatically recognizes and calibrates to these standard buffer values, which makes
pH calibration faster and easier.
To calibrate at 5 points you must select a 5-pt calibration in SETUP mode program P3.2
on page 36. You can select 2, 3, 4 or 5 calibration points for pH calibration.
4. Calibration
Important Information on Meter Calibration
When you recalibrate your meter, old calibration points are replaced on a
“point by point” basis in pH and completely for % saturation and mg/l (ppm).
For example:
• pH: if you previously calibrated your meter at pH 4.01, 7.00, and 10.01, and you
recalibrate at pH 7.00, the meter retains the old calibration data at pH 4.01 and
pH 10.01.
• % saturation and mg/l (ppm): All new calibrations automatically override existing
calibration data.
To view current calibration points:
• pH: Program P1.0 in the SETUP section, page 32.
• % saturation: Program P3.0 in the SETUP section, page 41.
• mg/l (ppm): Program P2.0 in the SETUP section, page 49.
To completely recalibrate your meter, or when you use replacement probes,
it is best to clear old calibration data by resetting the meter.
To reset the meter to its factory defaults:
• pH: Program P4.0 in the SETUP section, page 38.
• % saturation: Program P7.0 in the SETUP section, page 46.
• mg/l (ppm): Program P6.0 in the SETUP section, page 55.
NOTE: Resetting the meter will set meter to factory defaults.
pH, % saturation and mg/l (ppm) must be reset separately.
4.2
4.1
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