Hach-Lange PHC725 - Manual (Page 9)

5. Select the Calibration Reminder and update the settings:
Option Description
Reminder
Repeat The meter makes a sound when a calibration is necessary and at the
selected interval—Off (default), 2 h, 4 h, 8 h, 2 d, 5 d or 7 d.
Expires Calibration expires after the selected time—Immediately, Reminder +
30 min, Reminder + 1 h, Reminder + 2 h or Continue Reading.
Note: The meter cannot read samples after calibration has expired unless
Continue Reading is selected.
6. If prompted, enter a name for the new method settings. Other changes made to the
settings of an existing method are automatically saved with the same method name.
7. Push EXIT until the meter goes back to the measurement mode.
Table 3 Custom buffer sets
Buffer set
values Option Description
Std1 to
Std5 1.09 pH—25 °C Pre-set temperature compensated buffer values.
Note: It is necessary for selected standards to be different by a minimum of 2 pH units. For example, if
1.09 pH is selected for the first standard, the second standard must be different by at least 2 pH.
Standards that do not meet this minimum will show gray on the screen and will not be selectable.
1.68 pH—25 °C
4.01 pH—25 °C
4.65 pH—25 °C
6.86 pH—25 °C
7.00 pH—25 °C
9.18 pH—25 °C
9.23 pH—25 °C
10.01 pH—
25 °C
12.45 pH—
25 °C
Custom Buffer Custom buffer value.
Range = 2.000 pH to 14.000 pH.
Custom buffer values are not temperature compensated. Custom buffers must be read at
25 °C (77 °C).
No Buffer Select this option for undefined standards.
Change check standard options
1. Make sure that a probe is connected to the meter.
2. Push and select PHC725 Settings.
3. Select Modify Current Settings.
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