Encapsulating the thermocouple tip with dual shrink Teflon tubing will extend the life of your sensor. A sealed tip minimises the risk of moisture being pulled along the wire (known as condensate tracking), minimising oxidation of the thermocouple and extending the life. In addition the Teflon tip prevents potential errors due to grounding should a bare tip touch a conductive surface of inadequately grounded plant and equipment. Properly sealed hot junctions minimise the risk of air entering the chamber via the thermocouple during the autoclave air removal stage.