Mating and Unmating Connectors: It is important to prepare and mate connectors correctly, both in terms of the costs to repair them and to preserve data quality. Leaking connectors cause noisy data and even potential system shutdowns. Application Note 57: Connector Care and Cable Installation describes the proper care and installation of connectors for Sea-Bird instruments. The Application Note covers connector cleaning and cable or dummy plug installation, locking sleeve installation, and cold weather tips. Checking for Leakage and Cleaning Corrosion on Connectors: If there has been leakage, it will show up as green-colored corrosion product. Performing the following steps can usually reverse the effect of the leak: Thoroughly clean the connector with water, followed by alcohol. Give the connector surfaces a light coating of silicon grease. Re-mate the connectors properly — see Application Note 57: Connector Care and Cable Installation and 9-minute video covering O-ring, connector, and cable maintenance. Replacing Connectors: The main concern when replacing a bulkhead connector is that the o-rings on the connector and end cap must be prepared and installed correctly; if they are not, the instrument will flood. See the question below for general procedure on handling o-rings. Use a thread-locking compound on the connector threads to prevent the new connector from loosening, which could also lead to flooding. If the cell guard must be removed to open the instrument, take extra care not to break the glass conductivity cell.