Application Note
Deployment of Stainless Steel Data Loggers and Probes
in Saltwater and Other Corrosive Conditions
Products made with 316 Stainless Steel are rugged and resistant to corrosion
in most circumstances. However, 316 Stainless Steel is susceptible
to crevice corrosion when deployed in salt water, buried in
mud or other substances, or when in contact with dissimilar
metals. In these environments 316 Stainless Steel will eventually corrode allowing
water to enter and damage the electronics. The speed at which crevice
corrosion occurs is dependant upon factors such as salinity, level of dissolved
oxygen, temperature and flow. In warm stagnant salt water or
mud environments, the corrosion can start within hours and
cause a leak in a month or less. In colder, faster flowing
environments, a leak may occur within 6 months.
If long-term deployment in salt water is required, the logger should
be isolated from other metal objects or even placed in a sealed
housing suitable for the deployment depth containing a non-corrosive
liquid. Always rinse the logger with fresh water after
deployment in salt or brackish water.
One possible solution for saltwater deployment is
to place the logger in a sturdy protective bag filled with
fresh water. The pressure and temperature inside the protective
bag will equalize with the surrounding water. Be sure that
there is no air in the bag by submerging both the bag and logger
in a bucket of fresh water as you seal the bag.
Contact us for additional saltwater application
options.
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