Hach-Lange PHC28103 - Manual (Page 9)

Table 2 Custom buffer set
Buffer set values Option Description
Std1
Std2
Std3
Std4
Std5 1.09pH—25 °C Pre-set temperature compensated buffer values.
Note: Selected standards must differ by a minimum of 2 pH units. For example, if 1.09 pH is
chosen for the first standard, the second standard must differ by at least 2 pH. Standards that do
not meet this minimum will appear gray on the screen and will not be selectable.
1.68pH—25 °C
4.01pH—25 °C
4.65pH—25 °C
6.86pH—25 °C
7.00pH—25 °C
9.18pH—25 °C
9.23pH—25 °C
10.01pH—
25 °C
12.45pH—
25 °C
Custom Buffer Custom buffer value.
Range = 2.000 pH to 14.000 pH.
Custom buffer values are not temperature compensated. Custom buffers should be read
at 25 °C.
No Buffer Standard is undefined when this option is selected.
Change check standard options
1. Make sure a probe is connected to the meter.
2. Push and select PHC281 Settings.
3. Select Modify Current Settings.
4. Select Check Standards Options and update the settings:
Option Description
Standard Sets the temperature compensated buffer value for check standard—
• 4.01pH—25 °C
• 4.65pH—25 °C
• 6.86pH—25 °C
• 7.00pH—25 °C
• 9.18pH—25 °C
• 9.23pH—25 °C
• 10.01pH—25 °C
• 12.45pH—25 °C
• Custom
The standard value is shown on the Check Standard Options screen.
No temperature compensation for custom buffers.
Standard
Value When Standard is set to Custom, enter the standard value using the up/down
arrow keys.
5. Select Check Standard Reminder and update the settings:
Option Description
Reminder Repeat Sets the time interval for the check standard reminder—Off, 30 minutes,
2 h, 4 h, 8 h, 12 h or 24 h.
Allow Defer Allows the postponement of check standard reminders—Yes or No.
9