User Guide

7
4 MEASUREMENT MODE
The αlpha TDS 190 controller is capable of taking TDS measurement with
Automatic (ATC) or Manual (MTC) Temperature Compensation.
The measurements are displayed distinguishingly by the annunciators on the front
panel.
4.1 Measurement mode display
Press the MODE key to toggle between TDS and Temperature measurement
mode.
Conductivity Measurement Mode
The controller displays the selected TDS range number, R X (X ranges from 1 to
8), for 2 seconds before displaying the TDS measurement. The
ppm or ppt
annunciator will light up depending on which range is selected.
TDS Range Range No., R Resolution Cell Constant
0.00 – 10.00 ppm 1 0.01 ppm 0.1
0.0 – 100.0 ppm 2 0.1 ppm 0.1
0.0 – 100.0 ppm 3 0.1 ppm 1
0 – 1000 ppm 4 1 ppm 1
0.00 – 5.00 ppt 5 0.01 ppt 1
0.00 – 10.00 ppt 6 0.01 ppt 1
0.0 – 100.0 ppt 7 0.1 ppt 1
0.0 – 100.0 ppt 8 0.1 ppt 10
Temperature Measurement mode
Press MODE key once to view the temperature measurement. The °C annunciator
lights up. The display shows ATC or MTC, then the current measured temperature.
For selection of temperature compensation ATC or MTC, see Setup program P4.1.
NOTE: After pressing the MODE key to display Temperature, if there is no further
key-press, the Controller will automatically revert to TDS Measurement mode after
about 30 seconds.