Thermo Scientific AquaSensors
™
AV88 Universal Analyzer User Guide
40
5.3.
Navigating the User-Entered Concentration Table Screens
The AV88 can convert measured conductivity into % concentration based on a 10-point user-entered
concentration table. This feature is available for contacting and toroidal conductivity only. To enable this
feature, set the Sensor Units to % in the Configure menu. The measured values will be displayed as shown
below:
The table can be accessed using the AV88’s user interface. Each point in the table is composed of two
coordinates, conductivity and concentration. The conductivity coordinate is also known as the X coordinate,
and the concentration coordinate is also known as the Y coordinate.
Concentration Table Requirements
The table can have up to 10 points. If the table has fewer than 10 points, the last point in the table must be set
to 0
S/cm and 0%. Thus a typical table with four points will have the form shown in Table 1:
Table 1: A typical concentration table with four points.
Point Conductivity
X Coordinate
(
S/cm)
Concentration
Y Coordinate
(%)
1 0
0
2 1,000
10
3 5,000
50
4 10,000 99.99
5 0
0
6 0
0
7 0
0
8 0
0
9 0
0
10 0
0
Note: The coordinate values of 0
S/cm and 0% in point 5 indicate the end of the table.
Because point 5 is the end of the table, points 6-10 are ignored.
•
The conductivity coordinates must be monotonic
1
over the range of interest and increasing in value and be
between 0 and 2,000,000
S/cm.
•
The concentration coordinates must also be monotonic
1
over the range of interest, but can be either
increasing or decreasing and must be between 0 and 99.99%.
1
Monotonic means consistently increasing and never decreasing or consistently decreasing and never increasing in value.
6.971 %
30.8 °C
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