Appendix
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MXD70 Conductivity Setup and
Operating Guide
Appendi
Resin retainers must be effective and the cell must be installed so that it is accessible for cleaning. If
this is a problem with the CMC26/001/PT43 cell use the CMC34/001/PT43 which has wider spaced
electrodes of greater than 1.5 mm. This has been found to be less likely to trap such particles.
Conductivity cells if subjected to de-mineraliser regeneration reagents require excessive rinse time to
obtain satisfactory results, therefore, locate the cell where it will be isolated during regeneration. The
cell should not be used to measure high ionic content samples of greater than 20 μS/cm (less than 0.05
M.cm) since it can retain ionic contaminates and require excessive rinse down time for valid
measurements.
The instrument incorporates an electronic guard to minimise the effect of cable capacitance and a 4
wire temperature measurement system to allow accurate measurements. LTH 54D or similar cable
must be used to ensure correct operation.
The cell must be located in an active flowing part of the piping. Stagnant areas or dead legs must be
avoided to ensure a representative sample and prevent any bubbles from adhering to the cell surfaces.
Sample lines must be designed to maintain sample integrity. Do not expose the sample to atmosphere
to prevent absorption or loss of gases, particularly C0
2
which will affect conductivity.
The sample should be continuous at a stable flow rate of at least 100 ml/min and should be
maintained to enable sample line wetted surfaces to reach equilibrium with sample conditions. Do not
make measurements following changes to sample flow rate for the period of time required to recover
from transient effects on the particular sampling system.
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