Hach-Lange PHC745 - Manual (Page 10)

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 PHC805 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—
• 4.01 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
The standard value shows on the Check Standard Options screen.
No temperature compensation for custom buffers.
Standard
Value When the Standard is set to Custom, enter the standard value with 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 Lets the postponement of check standard reminders—Yes or No.
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