9
2. 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 on a “range
by range” basis in conductivity or TDS.
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.
• Conductivity/TDS: if you previously calibrated your meter at
1413 µS in the 0 to 1999 µS range and you recalibrate at
1500 µS (also in the 0 to 1999 µS range), the meter will
replace the old calibration data (1413 µS) in that range. The
meter will retain all calibration data in other ranges.
Note that if you calibrate a TDS value in an equivalent
conductivity range, the TDS value will replace the previous
conductivity value, and vice versa.
To view current calibration points:
• pH: Program P1.0 in the SETUP section, page 26.
• Conductivity/TDS: Program P5.0 in the SETUP section,
page 32.
To completely recalibrate your meter, or when you use a
replacement probe, 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 30.
• Conductivity/TDS: Program P9.0 in the SETUP section,
page 37.
NOTE: Resetting the meter will set meter to factory
defaults. Conductivity/TDS and pH must be reset separately.
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 "pH" units, the meter will read "pH"
units when you switch the meter on.
Do not reuse calibration solutions after calibration.
Contaminants in the solution can affect the calibration, and
eventually the accuracy of the measurements. See page 43
for information on our high-quality calibration solutions.
More information
• See section 2.1 (pages 10-11) for pH calibration
• See section 2.2 ( pages 12-13) for
conductivity/TDS calibration
• See section 2.3 (page 14) for T
emperature
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