Accumet XL 20, User Manual, Page: 107 / 199

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Resistivity Setup
XL20, 30, 50 and 60 meters
To Select Cell Constant
This setup option allows you to select the appropriate cell constant
of the cell that you are using. There are three cell constants to choose
from. Each is used for a different range of resistivity.
The Resistivity Cell Constant is set the same way as previously
described in Conductivity Setup. See
‘Conductivity Setup: Stable
Indicator/Auto Read Mode/Cell Constant’ section for instructions.
To Set Default Temperature
Resistivity is a temperature dependent measurement. This option allows you to select a default
temperature that the meter will use along with the temperature coefficient to calculate a
temperature corrected resistivity measurement. If an ATC probe is used, any value entered as a
default temperature will be overridden in favor of the actual measured temperature of the solution
the ATC probe provides to the meter. The default temperature can be set from -10°C to 110°C.
The Resistivity Default Temperature is set the same way as previously described in Conductivity
Setup. See
‘Conductivity Setup: Select Reference Temperature’ section for instructions.
To Set Reference Temperature
This setup option lets you select the reference temperature to be used in the determination of the
resistivity of your sample. The reference temperature is the temperature to which the resistivity
readings would be normalized. The reference temperature can be set from 15°C to 30°C.
The Resistivity Reference Temperature is set the same way as previously described in
Conductivity Setup. See
‘Conductivity Setup: Select Reference Temperature’ section for
instructions.
To Set Temperature Coefficient
The temperature coefficient is a value that reflects the degree to which
the sample’s resistivity is effected by temperature changes. The meter
will use the set temperature coefficient along with the measured
temperature provided by the ATC probe to calculate what the resistivity
would be at the selected reference temperature. If no ATC probe is
being used, the meter will use the set default temperature in the
calculation. The temperature coefficient can be set from 0 to 10.000%.
The Resistivity Temperature Coefficient is set the same way as
previously described in section
‘ Conductivity Setup: Set Alarm
Limits’ .
When you change
cell constants your
calibration factor will
automatically reset
to default values. It
is recommended
that you standardize
your meter to
establish a new
calibration factor.
NOTE: The meter
and probe with
ATC will measure
temperature even
if the temperature
coefficient is set
to 0.0%, however
a temperature
correction will not
be applied to the
measurement.