UWT has further developed the RFnivo® 3100 capacitive level limit switch for this type of measurement task in the dust extraction of flue gases so that it meets and withstands the demanding conditions. All process-contacting parts of the sensor have been designed to be completely corrosion-resistant. Firstly, the RF boom is coated with PFA Teflon® and, secondly, a section of the process connection thread has been completely made of PTFE so that all parts in contact with the process are fully corrosion-protected.
The shaft of the RFnivo® limit switch is fully coated with PFA Teflon®. It is resistant to almost all chemicals and can withstand high temperatures. In contrast to a spray coating, the type of coating of the RF probe is much more resilient, up to 1.5mm thick, and thus has more protection in abrasive applications.
The RFnivo® 3100 with fully coated probe boom can be made with a boom length from 200mm up to 1500mm and can therefore be used in a variety of installations.
Process connection thread made of PTFE
In plastics, PTFE is the material that offers most resistance to most basic chemicals. Apart from liquid sodium and fluorine compounds, PTFE is resistant to almost all media even at higher temperatures. Corrosion on the thread itself is thus reduced by a special design using Teflon®. Due to the extremely low surface tension of PTFE, no dust-like materials from the flue gas filters stick to or cake the process connection thread. In addition, the capacitive RF limit switch already offers a particularly high load capacity in the standard version. If overpressure is present in the process tank, this can be up to 25 bar for and still the RF probe will operate.
Advanced technologies for flue gas dust extraction
The capacitive fully-coated RF sensor is a new safe solution for all systems where applications with a particularly aggressive process environment exist.