When a temperature sensor is used in processing applications where the environment is not physically or chemically compatible with the sensor, a thermowell is a pressure-tight container that protects the sensor and prolongs its life. Thermowells, which are installed directly into piping systems, make it easier to replace sensors in high pressure pipes and remove the need to stop the process flow or drain the system in order to perform sensor maintenance tasks. The use of thermowells allows for easy sensor relocation across a plant.