Hach-Lange PHC745 - Manual (Page 9)

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.
Change calibration 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 Calibration Options and update the settings:
Option Description
Buffer Set Sets the temperature compensated buffer set for calibration:
• Color Coded—4.01, 7.00, 10.01 (default)
• IUPAC—4.01, 7.00, 10.01, 12.45
• DIN—4.65, 9.23
• IUPAC—4.01, 6.86, 10.01, 12.45
• IUPAC—4.01, 6.86, 9.18, 12.45
• IUPAC—4.01, 7.00, 9.18, 12.45
• Custom Buffer Set (refer to Table 3 )
Custom buffer sets are characterized at 25 °C (77 °F).
Buffer set values show on the Calibration Options screen.
Note: Measure only the minimum calibration points specified in Minimum
Cal Points to complete a calibration.
Buffer Set
Values Sets the buffer values if Custom Buffer Set is selected (refer to Table 3 ).
Minimum Cal
Points Sets the minimum number of calibration points that are necessary to
complete a calibration—1 (default), 2 or 3.
Slope Limit Sets the slope limit—1% to 20% (acceptable slope criteria, default = 15%).
Set the slope between the set limits for a correct calibration.
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.
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