In case of the following conditions, the protective tube shall be used to protect the temperature sensing part

    * For corrosion resistant fluids, it is necessary to use protective tube of suitable materials.

    * In case of high pressure, it is necessary to use protective tube suitable for working pressure.

    * If the fluid flows, it is necessary to use the appropriate flow rate and flow protection tube.

    * If the thermometer fluid leaks when pulled out, it is necessary to use a protective tube.

    * If the filling liquid in the thermometer leaks from the sensor, it is necessary to use a protective tube.