NAVI D-25 Instruction Manual page 38

● Standard solution calibration
D-52/53/54/55
Perform a one-point calibration for making simple pH
measurements; for more accurate measurements,
perform at least a two-point calibration.
Up to three points can be used for calibration. If you
perform calibration for a fourth points, "ERR06
Calibration point error" is displayed.
Standard solutions for calibration are defaulted to pH 2,
pH 4, pH 7, pH 9, and pH 12.
"3.4.3 pH standard solution setting" page 77
This section will explain how to conduct a two-point
calibration using pH 7 and pH 4 standard solutions.
Calibration procedure
1.
Press the CAL key while in the pH Measurement
mode.
The meter enters the Calibration mode and >CAL<
is displayed.
Displayed item
differs depending on
the standard
solution setting.
The mode cannot be changed during Auto Hold
calibration (while "HOLD" is blinking or continually
displayed.
2 Taking Measurements
2.5 Measuring pH
27