APPENDIXES
Milli-Q Synthesis/Synthesis A10 93
APPENDIX 6 COMP MODE 1 AND COMP MODE 2
Section 4-13 in this manual explains how to display Non Temperature Compensated Resistivity or Non Temperature
Compensated Conductivity Displays. When you are using the Milli-Q Software to make this change, you may
notice the terms COMP MODE 1, COMP MODE 2 and OFF.
What do these mean?
OFF means that the Temperature Compensation is off. The displayed Resistivity or Conductivity will not be
temperature compensated. The temperature of the water will be shown at the same time as the non temperature
compensated Resistivity or Conductivity value.
COMP MODE 1 is the normal setting. This setting will display Resistivity or Conductivity values that are temperature
compensated to 25 C. The values are normalised. The Software of the Milli-Q eliminates small fluctuations of
temperature compensated Resistivity or Conductivity due to the fact that these two parameters are not measured at
the same time.
COMP MODE 2 is a setting that gives the actual temperature compensated Resistivity or Conductivity values. In
some operating conditions the feed water can be warmer or cooler than the water temperature inside the Milli-Q.
This can cause small fluctuations of the resistivity and Conductivity values. Resistivity values could fluctuate between
18.0 M.cm and 18.4 M.cm @ 25 C while the actual resistivity value is 18.2 M.cm @ 25 C. The
COMP 2 setting should be used in applications that require the detection of trace ionic levels or when performing
the verification of the Milli-Q Resistivity Meter Operation with an independent calibrated Resistivity Meter.
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