WIKA Protection Tube with Flange (TW40)

Version per DIN 43772 form 2F, 3F


  • Chemical industry, process technology, equipment manufacturing
  • For low and medium process loads
  • For high chemical loads

Special features

  • For highly corrosion-resistant coating (models TW40-8, TW40-9)
  • Good price/performance ratio for special materials
  • Fast-response design (models TW40-9, TW40-E)

Sales Contact (Wika.sales@asyatrafo.com)




Each thermowell/protection tube is an important component of any temperature measuring location. It is used to separate the process from the surrounding area, thus protecting the environment and operating personnel and keeps aggressive media, high pressures and flow rates from the temperature probe itself and thereby enables the thermometer to be exchanged during operation.

Based on the almost limitless application possibilities, there are a large number of variants, such as protection tube designs or materials. The type of process connection and the basic method of manufacture are important design differentiation criteria. A basic differentiation can be made between threaded and weld-in protection tubes, and those with flange connections.

Furthermore, one can differentiate between protection tubes and thermowells. Protection tubes are constructed from a tube, that is closed at the tip by a welded solid tip. Thermowells are manufactured from solid bar stock.

The TW40 series of protection tubes with flange connection are suitable for use with numerous electrical and mechanical thermometers from WIKA.

Due to their design to DIN 43772, these protection tubes for low and medium process loads are suitable for use in the chemical industry, process technology and equipment manufacturing.