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Levelogger User Guide - Software Version 3.4.0 or Higher
Page 51
Marine or Brackish Installations
When installing the Levelogger in salt or brackish water or in a liquid having
a specific gravity (density) different than fresh water, the density difference is
compensated for by checking the Density Adjustment checkbox in the Levelogger
Settings window and inputting the density of the monitored fluid. See Section
5.1 for details in compensating the Levelogger for fluid density differences.
The LT Levelogger Gold can be used for monitoring in salt or brackish water.
However, long term use of the first generation stainless steel body LTC Levelogger
or LT Levelogger, or LTC and LT Levelogger Junior in salt or brackish water is
not recommended, as the salt or other pollutants may cause pitting which can
lead to perforation of the Levelogger’s casing. To minimize this effect, regularly
lift the Levelogger from the liquid; within seconds a thin protective layer will
be formed by oxidation. Again, this precaution applies to the first generation
stainless steel LTC and LT Leveloggers or LTC and LT Levelogger Junior. If using
an LT Levelogger or Levelogger Junior in a continuous salt/brackish monitoring
scenario, the stainless steel body of the datalogger can be protected in a manner
similar to the freezing protection method described in Section 11.1.4. The
Levelogger can be placed in balloons and the balloons filled with non-corrosive/
non-toxic fluid. As pressure changes, the fluid encasing the loggers will transmit
the pressure differential to the datalogger’s pressure transducer. Care must be
taken in the selection of the balloon material or filling fluid such that the balloon
material prevents diffusion of salts across the concentration gradient or that the
filling fluid is comprised of polymeric molecules too large to diffuse out of the
balloon material.