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Channel Specific Settings and
Features
Within the Channel 1, Channel 2, Channel 3 and Channel 4 setup menus is the Mode menu,
which can be used to customize measurement settings and parameters for the selected
channel. This section provides detailed information on the options available within Mode menus
when using the various V
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measurement modules. Detailed information on additional
advanced meter features is also provided.
General Mode Settings
Sample ID
If Manual is selected as the
type of Sample ID, use the popup alphanumeric keypad screen to
enter a sample ID up to ten characters long. The entered sample ID will be recorded with
subsequent measurements and saved to the data log or exported to an external device,
depending on the meter communication settings in the
Instrument Settings
setup menu.
If Auto Incremental is selected as the type of Sample ID, use the popup numeric keypad screen
to enter a numeric value up to ten characters long. The entered sample ID will be used as the
starting value and the meter will automatically increase the value by one for each subsequent
measurement. The sample IDs will be recorded with each measurement and saved to the data
log or exported to an external device, depending on the meter communication settings in the
Instrument Settings
setup menu.
Press the
f2 (Sample ID) key in the measurement mode to open a shortcut to the Sample ID
setup menu and enter a new sample ID.
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Channel Specific Settings and Features
Stability
The Stability setting allows the operator to set when a measurement is recognized as stable by
the meter. When the Smart option is selected, the measurement resolution in conjunction with
an algorithm that evaluates measurement fluctuations are used to determine when the
measurement value is stable. When the Fast, Medium or Slow option is selected, only the
algorithm is used to determine when the measurement value is stable. Approximate mV per
minute values, estimated based on ideal measurement conditions, are shown below. These
values are theoretical examples only and actual mV per minute fluctuations will vary based on
individual measurement conditions.
Stability Setting
Approximate mV per Minute Fluctuation
Smart Stability
0.1 resolution or 1 significant digit
7.6
0.01 resolution or 2 significant digits
2.9
0.001 resolution or 3 significant digit
1.0
0.0001 resolution or 4 significant digit
0.4
Fast Stability
7.6
Medium Stability
2.9
Slow Stability
1.0
Averaging
The Averaging setting allows the operator to select Automatic Smart averaging for faster
measurement stability or Off for no measurement averaging once the stability criteria is met.
Alarms
The Limit Alarm
allows the operator to s
et a high limit value and low limit value used
to evaluate
measurements. If a measurement goes above the high limit value or below the low limit value, the alarm
is activated. For example, when the high limit is set to 8.500 pH and the low limit is set to 4.500 pH, the
Limit Alarm is activated when a measurement of 8.501 pH or higher or a measurement of 4.499 pH or
lower is observed in the measurement mode.
The Cal Due Alarm
allows the operator to s
et a calibration interval in hours. If a calibration is not
performed within the
specified calibration interval, the alarm is activated.
The Set Point Alarm
allows the operator to s
et a base value and offset value used to evaluate
measurements. If the measurement goes above or below the base value by the entered offset value, the
alarm is activated. For example, when the base value is set to 7.000 pH and the offset value is set to
2.000 pH, the Set Point Alarm is activated when a measurement of 9.000 pH or higher or a
measurement
of 5.000 pH or lower is observed in the measurement mode.
Ø
Use the Buzzer – Alarm setting in the
Instrument Settings
setup menu to enable an audible
beep whenever an alarm is activated.
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Channel Specific Settings and Features
pH and
ISE Mode Settings
Buffer Group and Automatic Buffer Recognition
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meters with pH, pH/ISE and pH/LogR modules are capable of automatically
recognizing pH 1.68, 4.01, 7.00, 10.01 and 12.46 buffers; pH 1.68, 4.01, 6.86, and 9.18 buffers;
or up to six custom buffers during a pH calibration, depending on the pH buffer set that is
selected in the setup menu. During a calibration, the meter uses the selected buffer set and the
raw mV reading of the pH electrode in the buffer to recognize and display the buffer value at the
measured temperature. The raw mV reading of the pH electrode in the buffer must be within
one pH unit (± 59 mV) of the buffer’s theoretical mV value for the meter to recognize the buffer.
USA Buffer Set
DIN Buffer Set
Custom Buffer Set
pH
Buffer mV range
pH
Buffer mV range
Entered pH
Buffer Value
mV range (based on
entered pH value)
1.68
+256 to +374 mV 1.68
+256 to +374 mV 1
st
buffer value Theoretical ± 59 mV
4.01
+119 to +236 mV 4.01
+119 to +236 mV 2
nd
buffer value Theoretical ± 59 mV
7.00
-59 to +59 mV
6.86
-51 to +67 mV
3
rd
buffer value Theoretical ± 59 mV
10.01
-236 to -119 mV 9.18
-70 to -188 mV
4
th
buffer value Theoretical ± 59 mV
12.46
-264 to -382 mV
5
th
buffer value Theoretical ± 59 mV
6
th
buffer value Theoretical ± 59 mV
Testing a pH Electrode for Automatic Buffer Recognition
Use the following procedure to verify that the raw mV reading of the pH electrode is within one
pH unit (± 59 mV) from the theoretical mV reading of the pH buffer, and therefore verify that the
pH electrode in use is capable of performing automatic buffer recognition.
1.
Prepare the pH electrode according to the electrode user manual. Set the meter
measurement mode to mV.
2.
Rinse the pH electrode
with distilled water, blot it dry with a lint-free tissue and place the pH
electrode into a pH 4.01 buffer at approximately 25 °C.
3.
Wait for the measurement to stabilize and record the mV value of the pH 4.01 buffer when
the measurement is stable.
4.
Remove the pH electrode from the pH 4.01 buffer.
5.
Rinse the pH electrode with distilled water, blot it dry with a lint-free tissue and place the pH
electrode into a pH 7.00 buffer at approximately 25 °C.
6.
Wait for the measurement to stabilize and record the mV value of the pH 7.00 buffer when
the measurement is stable.
7.
The mV reading of the pH electrode in pH 4 buffer should be +119 to +236 mV and in pH 7
buffer should be -59 to +59 mV. If the mV readings are in the correct ranges, the pH
electrode is capable of performing automatic buffer recognition. If the mV readings are not
in the correct ranges, manually enter the pH buffer values during a pH calibration.
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