Temperature sensors of this construction are used as universal thermometer, preferably in processes with liquid or gaseousmedia at low pressure.
The thermometer are supplied with flexible sheath ( mineral insulated cable) or rigid bulb. The protection against aggressive media is available by the use of different materials and protections of the bulb. Cable and bulb built a fixed connection.
As a standard we use a temperature sensor PT 100/2-wire, acc. DIN IEC 751. Their are no limits regarding the sensor, which can be built-in.