Hach-Lange HQD - Sodium (Na+) Ion Selective Electrode ISENa - Manual (Page 9)

DOC272.53.80027 9
Change measurement options
Methods are groups of default or user defined settings relevant to specific applications. If
the meter is set to the default method and the Modify Current Settings option is chosen, a
prompt will display to name the method after changes are entered. The settings are saved
with this name to distinguish them from the default method settings, which cannot be
changed. A saved method can be used instead of repeatedly adjusting individual settings.
Changes made to a user defined method are automatically saved with the existing name.
Multiple methods can be saved for the same probe.
1. Make sure an electrode is connected to the meter.
2. Push the METER OPTIONS key and select (ISENa381) Settings.
3. Select Modify Current Settings.
4. Select Measurement Options.
5. Update the settings. Refer to Table 2 .
Check standard options
• Standard
• Check standard reminder
• Acceptance criteria
Table 1Parameter-specific settings
Setting Options
Table 2 Measurement options settings
Setting Options Description
Units
mg/L (default)
µg/L
g/L
g/kg
mol/L
mmol/L
mol/kg
%
ppm
ppb
Select the preferred unit for ISE measurements.
Note: mV units are shown when the detailed display is
selected.
Significant digits
2
3 (default)
4
Significant digits are the digits of a number that are known
with certainty or have meaning that contributes to accuracy.
Auto stabilization
On (default)
Off
The default stability drift rate is 1.000 mV/min. Lower stability
criteria will require longer stabilization times, but the
measurement will be more precise. Higher stability criteria will
require shorter stabilization times, but the measurements may
be less precise.
Stability criteria 0.1 - 9.9 mV/min Selectable
Measurement limits
Lower limit (default: 0.023 mg/L)
Upper limit (default: 14.00 mg/L)
The measurement limits can be set to match the acceptable
values for the sample. When the measurement is above the
upper limit setting or below the lower limit setting, the meter
will show an “Out of limits” message. This message can alert
the user to a potential problem with process conditions.