pH Measurement
pH electrode information
On this meter is possible to use electrode with integrated temperature sensor else link two different probes for
pH and temperature.
The BNC socket of electrode connects pH socket, RCA socket connects temperature socket. When dip the
electrode in the solution, please stir the solution briefly and allow it to stay in the solution until a stable reading
is reached.
pH calibration consideration - Standard buffer solution
The meter uses two series of standard buffer solution: USA series and NIST series, and also customer-defined
solution. Please see the table below for the two series of standard buffer solution. For customer-defined solution,
please select it in setup menu parameter P1.1.
pH standard buffer solution series
Three-point calibration
The instrument can perform 1-3 point calibration. The first point of calibration must be 7.00 pH (or 6.86 pH)
standard solution, then select other standard solution to perform the second and the third point calibration; the
meter is able to recognize the buffer solutions in analysis. During the calibration process, display get blue color
and show the slope of acidity range and alkalinity range respectively.
7.00 pH and
4.00 pH or 1,68 pH
6.86 pH and
4.01 pH or 1,68 pH
7.00 pH, 4.00 pH or 1,68
pH, 10.01 pH
6.86 pH, 4.01 pH or
1,68 pH, 9.18 pH
Calibration Intervals
Calibration intervals depend on the sample, the electrode performance, and the required accuracy. For high
accuracy measurements (≤ ±0.02pH), the meter should be calibrated immediately before taking a measurement.
For general accuracy (≥±0.1pH), the meter can be calibrated and used for approximately one week before the
next calibration.
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