Talk:Cleaning the POS connector

For detailed information see 'Cleaning of the Electrical Connection' in the POS Service manual MiPNet08.04.

The two electronic connections of the POS connector (to the POS and to the Main unit) make a POS connector that has been disconnected from the POS or from the Main unit or from both particularly sensitive to damage by ESD. It is therefore of primary importance to follow the guidelines for ESD protection MiPNet14.1 whenever handling a POS connector.

Cleaning the electrical connection

Unscrew the POS and check both sides of the electrical connection (the gold pin and thread both on the POS and on the POS connector). Remove any contamination such as grease and moisture with a fine paper towel. Soak a paper towel in ethanol and clean the gold pin and threads. If the gold pin and thread on the POS connector are discolored or stained repeat cleaning with a paper towel soaked in ethanol: Continue cleaning until a fresh paper towel stays clean. Finally, apply a drop of contact oil to each of the golden pins and threads on POS connector and POS. (You can find a small of bottle of contact oil in your accessories box). If you have also done a Sensor service or changed the POS membranes allow the oxygraph to run over night before repeating the Sensor test. If all service precautions fail to solve the problem, a new POS connector has to be applied.

Cleaning the spring mechanism

Media outside the chamber or other spills may get into the mechanical part of the POS connector restricting the operation of the spring mechanism hard. The outside of the POS connector should therefore be cleaned with pure water from time to time. Apply a POS to the POS connector and make sure its seal (to the connector) is tight. Leave the POS connector attached to the oxygraph main unit or make sure that the plug, which connects the POS connector to the main unit, does not get wet (parafilm, or some other form of shielding). This will ensure that only the outside of the POS connector becomes wet. Then rinse the blue plastic of the connector with pure water, working the spring loaded holder several times (similarly to when inserting the connector into the chamber). This will dissolve any media stuck in the mechanical part of the POS connector.