User guide

I-E67-84-1B February,2002 8-10
The REF Z value is set using the Smart Key
to increment the blinking digit, the Smart
Key to move to the next digit, and the ENTER
Smart Key to enter the new value. See Section
13, Diagnostics, for more information on
diagnostic reporting.
Ion Concentration State (Advanced)
The ION.CON (i.e., Ion Concentration) State
allows for pION sensor inputs to be converted
to concentration units such as ppb and ppm.
This state uses temperature compensated mV
values and applies a logarithmic function that
has a fixed end point in millivolts, an ion
valence ranging from -3 to +3, and an end
point magnitude which can be set to 10, 100,
or 1000.
The ION.CON State functions by associating an
end millivolt value to an end magnitude value.
The valence determines the millivolt change
per decade of concentration and is defined by
the Nernst Equation (i.e., 59.16 mV/decade for
a valence equal to 1, 29.58 mV/decade for a
valence equal to 2, and 19.72 mV/decade for a
valence equal to 3). If the valence is
negative the millivolt/concentration
relationship will have a negative slope. The
number of magnitudes defines the analyzer
output. For example, two magnitudes would set
the output to 0-10% for the first magnitude
and 10-100% for the second magnitude.
Configure an ION.CON Analyzer State using
Figure 8-4 as a reference and the following
procedure:
1) Enter the ION.CON State using the ENTER
Key.
2) Set the engineering UNIT by toggling to
the desired unit using the NEXT Key and
entering the unit using the ENTER Key.
3) Set the VALENC (i.e., valence) by
incrementing or decrementing the
displayed value using and Keys
respectively, and entering the new value
using the ENTER Key.