BOQU PHS-1701, User Manual, Page: 7 / 21

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2. Operation
2.1 Calibration
2.1.1 Standard buffer solution groups
The instrument can be calibrated for 1 point, 2 point or 3 points. During
calibration, the meter automatically recognizes the pH of the standard buffer
solution. The automatic temperature compensation procedure is solidified in the
meter (see appendix).
The instrument has 8 sets of buffer solution (see appendix). The settings for the
buffer solution group refer to 2.4.1.
2.1.2 One point calibration
2.1.2.1 Calibration
Place the sensor in the buffer and press the "Cal" button to start the calibration.
The calibration icon will be displayed. After the signal is stabilized, the instrument
will automatically end according to the pre-selected end point or press the "Read"
button.
2.1.2.2 Store calibration result
After measuring value stable, press “Read” button, meter will display zero point
and slope, and automatically return to measurement interface.
Note
：
When doing one point calibration, only zero point was adjusted. If sensor made
multi points calibration before, it’s slope will be reserved, otherwise the theory