Inert gas filled thermometer developed and manufactured in accordance with the standard, built to resist the most severe operating conditions created by the environment and the process medium. Mainly used in chemical, petrolchemical processing industries. To allow optimum fitting to the process, individual insertion lengths and different process connections can be selected. It can be equipped with a capillary of different lengths and materials, naked or covered, to ensure distance mounting. A TIG welded case/bulb strengthens the whole construction. A leak tight fit is ensured if the instrument is filled with a dampening fluid to prevent damage due to vibration.