Hach-Lange PHC745 - Manual (Page 8)

Table 2 Parameter-specific settings
Setting Options
Measurement Options
• Resolution
• Upper and lower range limits
Calibration Options
• Buffer set
• Buffer set values (if Custom Buffer Set selected)
• Reminder
• Minimum Cal points
• Slope limit
Check Standard Options
• Standard (temperature compensated buffer or custom at 25 °C (77 °F))
• Reminder
• Acceptance criteria
• Standard value at 25 °C (77 °F) (if custom standard selected)
Units
• pH
• mV
Change measurement options
Methods are groups of default or user-defined settings related to specific applications. If
the meter is set to the default method, a prompt for a new name method shows. The
settings are saved with this name to identify them from the default method settings, which
cannot be changed. Use a saved method as an alternative of many adjustments to the
individual settings. Changes made to a user-defined method are automatically saved with
the existing name. Save different methods for the same probe on each meter.
1. Make sure that a probe is connected to the meter.
2. Push and select PHC805 Settings.
3. Select Modify Current Settings.
4. Select Units. Select pH (default) or mV.
Note: Use the mV option to find the probe offset in a pH 7 buffer or to measure the slope. Both
units show when the Detail Display mode is selected.
5. Select Measurement Options and update the settings:
Option Description
Resolution Set the resolution:
• 0.1 pH—Fast
• 0.01 pH—Fast (default)
• 0.01 pH—Medium
• 0.01 pH—Slow, or
• 0.001 pH—Slow
The resolution has an effect on the number of decimal digits and the
stabilization time. More stabilization time is necessary for higher resolution
measurements. Slower stabilization times give higher accuracy
measurements.
Measurement
Limits Set the measurement limits—Lower limit (default: 0.00 pH) or Upper limit
(default: 14.00 pH).
Set the measurement limits to agree with the permitted values for the
sample. When the measurement is above the upper limit setting or below
the lower limit setting, the meter shows an "Out of limits" message. This
message is an alert to a possible problem with the process conditions.
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